Gonfa Kewessa, Lemma Tiki, Dejene Nigatu, Demeke Datiko
Forest coffee areas are hotspots areas for conservation of biodiversity due to anthropogenic effect on diversity and abundance of indigenous species. This study was aimed to determine the effect of forest coffee management on woody species diversity and composition. The study was conducted in Dellomena and Harenna Buluk districts where natural forest and forest coffee are found adjacently. Systematic sampling method was used to collect woody species data from 16 transect lines. Eighty (80) sample quadrats of 20 m × 20 m quadrat size for mature trees/shrubs and five 5 m × 5 m subplots within each quadrat for saplings and seedlings were used. Forty-seven species of 29 families and 39 species of 24 families were recorded in natural forest and forest coffee areas respectively. Woody species frequently recorded in most of the sample plots were Celtis africana (100%), Podocarpus falcatus (95%), Strychnos mitis (95%), Diospyros mespili-formis (95%) and Diospyros abyssinica (90%) in the natural forest, and Celtis africana (95%) and Podocarpus falcatus (95%) in the forest coffee. Woody species richness (P = 0.000), Shannon diversity (P = 0.000), Simpson diversity indices (P = 0.02) and dominance (P = 0.02) were sig-nificantly varied between the two forests. This findings revealed significantly higher woody species diversity and richness in natural forest than forest coffee. Negative effects were noticed due to coffee management practices on woody species diversity and composition in forest coffee areas. Hence, reducing the human pressure on forest coffee via awareness raising and training on the effect of coffee management activities and introduction of environmentally friendly forest coffee management techniques are crucial to maintain ecological service and economic benefit of the forest coffee.
{"title":"Effect of Forest Coffee Management Practices on Woody Species Diversity and Composition in Bale Eco-Region, Southeastern Ethiopia","authors":"Gonfa Kewessa, Lemma Tiki, Dejene Nigatu, Demeke Datiko","doi":"10.4236/ojf.2019.94015","DOIUrl":"https://doi.org/10.4236/ojf.2019.94015","url":null,"abstract":"Forest coffee areas are hotspots areas for conservation of biodiversity due to anthropogenic effect on diversity and abundance of indigenous species. This study was aimed to determine the effect of forest coffee management on woody species diversity and composition. The study was conducted in Dellomena and Harenna Buluk districts where natural forest and forest coffee are found adjacently. Systematic sampling method was used to collect woody species data from 16 transect lines. Eighty (80) sample quadrats of 20 m × 20 m quadrat size for mature trees/shrubs and five 5 m × 5 m subplots within each quadrat for saplings and seedlings were used. Forty-seven species of 29 families and 39 species of 24 families were recorded in natural forest and forest coffee areas respectively. Woody species frequently recorded in most of the sample plots were Celtis africana (100%), Podocarpus falcatus (95%), Strychnos mitis (95%), Diospyros mespili-formis (95%) and Diospyros abyssinica (90%) in the natural forest, and Celtis africana (95%) and Podocarpus falcatus (95%) in the forest coffee. Woody species richness (P = 0.000), Shannon diversity (P = 0.000), Simpson diversity indices (P = 0.02) and dominance (P = 0.02) were sig-nificantly varied between the two forests. This findings revealed significantly higher woody species diversity and richness in natural forest than forest coffee. Negative effects were noticed due to coffee management practices on woody species diversity and composition in forest coffee areas. Hence, reducing the human pressure on forest coffee via awareness raising and training on the effect of coffee management activities and introduction of environmentally friendly forest coffee management techniques are crucial to maintain ecological service and economic benefit of the forest coffee.","PeriodicalId":63552,"journal":{"name":"林学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44568945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Allocation of mobile chippers is a tactical problem of management in a bioenergy supply chain. It influences the entire supply cost of the wood chip since the transportation distance and the chipping productivity decide the transportation cost. Great and concentrated demands of woody biomass require multiple suppliers, and there should be the best allocation of mobile chippers which minimize the entire supply cost. This study aims to clarify better management of the supply chain consisting of multiple players for a great and concentrated demand for wood chip. The model was a supply chain for a typical biomass power plant with 5.8 MW capacity. Suppliers were assumed to select mobile chippers from two sizes, 140-kW and 353-kW. By the model simulation, it was clarified that the well-considered allocation of two different mobile chippers could reduce the entire supply cost less than the conventional system using a fixed chipper at the power plant. The best management was to use only the 353-kW chippers, and secondly to allocate the less productive chippers closer to the demand to prevent the incline of the transportation cost. However, the possible conflict was also specified as the increased cost of the suppliers using more productive chippers in the second best allocation strategy. This result emphasizes the necessity of resolving such conflict by making the collaborative relationship among stakeholders which has been pointed out by other researches as well to sustain the better condition of the supply chain.
{"title":"Allocation of Mobile Chippers for a Concentrated Bioenergy Demand","authors":"Mika Yoshida","doi":"10.4236/ojf.2019.94016","DOIUrl":"https://doi.org/10.4236/ojf.2019.94016","url":null,"abstract":"Allocation of mobile chippers is a tactical problem of management in a bioenergy supply chain. It influences the entire supply cost of the wood chip since the transportation distance and the chipping productivity decide the transportation cost. Great and concentrated demands of woody biomass require multiple suppliers, and there should be the best allocation of mobile chippers which minimize the entire supply cost. This study aims to clarify better management of the supply chain consisting of multiple players for a great and concentrated demand for wood chip. The model was a supply chain for a typical biomass power plant with 5.8 MW capacity. Suppliers were assumed to select mobile chippers from two sizes, 140-kW and 353-kW. By the model simulation, it was clarified that the well-considered allocation of two different mobile chippers could reduce the entire supply cost less than the conventional system using a fixed chipper at the power plant. The best management was to use only the 353-kW chippers, and secondly to allocate the less productive chippers closer to the demand to prevent the incline of the transportation cost. However, the possible conflict was also specified as the increased cost of the suppliers using more productive chippers in the second best allocation strategy. This result emphasizes the necessity of resolving such conflict by making the collaborative relationship among stakeholders which has been pointed out by other researches as well to sustain the better condition of the supply chain.","PeriodicalId":63552,"journal":{"name":"林学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46605329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The present study investigated the adaptability and growth of a fast-growing clone (BN1) of N. cadamba planted as short-rotation plantation species in the south subtropical region of China, using 17 sampled sites representing different environments, planting models and ages, and local weather station temperature records. BN1’s growth characteristics were further compared with the most productive eucalypts planted nearby. The survival of BN1 seedlings raised and transplanted with tissue-culture micro-cuttings was >94.0% in the 1st year, and the percentage of the effective trees with diameter at breast height ( Dbh ) ≥ 8 cm was >71.0% over 30-month old. Most of the sampled sites and trees were susceptible to low-temperature or frost injury in the 1st winter, with average damage index ( Id ) ranging from 0.1 to 2.6. Some sites/trees were infected by caterpillar or borer pests, but the damage was neglectable. The injured trees quickly sprouted out leading shoots and recovered their growing vigor from low temperature or insect damage. Temperature factors were closely related to Id (P °C) with risk of significant frost damage on BN1 trees; one site (No. 9) was not suitable with frequent and heavy cold damage ( Id =2.6 ). BN1 grew extremely fast, with average diameter at breast height ( Dbh ) ranging from 14.5 - 20.3 cm and average tree height ( Ht ) from 12.3 - 16.0 m at 54-month old, and Dbh from 17.8 - 22.7 cm and from 14.4 - 15.9 m at 66-month old, over different sites/soils and planting models. Peak for both Dbh and Ht appeared in the 2nd year, but after 6-year old for average individual tree volume ( Vt ). BN1 was faster in Dbh at most sites but slower in Ht at all sites than eucalypts compared. Some sampled sites of BN1 performed similarly as or obviously better than most productive eucalypts in stock volume (Vs). With properly planting density, tending and rotation, BN1 could be expected to outperform fast-growing eucalypts in terms of Dbh , Vt and Vs, and to produce all diameter grades of timbers if the rotation age is extended beyond 8 to 9 years. Discussion was also given to potential silvicultural models, risks and limitations of planting BN1 and other superior N. cadamba varieties.
{"title":"Adaptability and Growth of a Fast-Growing Neolamarckia cadamba (Roxb.) Bosser Clone in the South Subtropical Region of China","authors":"R. Wei, Wei Zhu","doi":"10.4236/ojf.2019.94024","DOIUrl":"https://doi.org/10.4236/ojf.2019.94024","url":null,"abstract":"The present study investigated the adaptability and growth of a fast-growing clone (BN1) of N. cadamba planted as short-rotation plantation species in the south subtropical region of China, using 17 sampled sites representing different environments, planting models and ages, and local weather station temperature records. BN1’s growth characteristics were further compared with the most productive eucalypts planted nearby. The survival of BN1 seedlings raised and transplanted with tissue-culture micro-cuttings was >94.0% in the 1st year, and the percentage of the effective trees with diameter at breast height ( Dbh ) ≥ 8 cm was >71.0% over 30-month old. Most of the sampled sites and trees were susceptible to low-temperature or frost injury in the 1st winter, with average damage index ( Id ) ranging from 0.1 to 2.6. Some sites/trees were infected by caterpillar or borer pests, but the damage was neglectable. The injured trees quickly sprouted out leading shoots and recovered their growing vigor from low temperature or insect damage. Temperature factors were closely related to Id (P °C) with risk of significant frost damage on BN1 trees; one site (No. 9) was not suitable with frequent and heavy cold damage ( Id =2.6 ). BN1 grew extremely fast, with average diameter at breast height ( Dbh ) ranging from 14.5 - 20.3 cm and average tree height ( Ht ) from 12.3 - 16.0 m at 54-month old, and Dbh from 17.8 - 22.7 cm and from 14.4 - 15.9 m at 66-month old, over different sites/soils and planting models. Peak for both Dbh and Ht appeared in the 2nd year, but after 6-year old for average individual tree volume ( Vt ). BN1 was faster in Dbh at most sites but slower in Ht at all sites than eucalypts compared. Some sampled sites of BN1 performed similarly as or obviously better than most productive eucalypts in stock volume (Vs). With properly planting density, tending and rotation, BN1 could be expected to outperform fast-growing eucalypts in terms of Dbh , Vt and Vs, and to produce all diameter grades of timbers if the rotation age is extended beyond 8 to 9 years. Discussion was also given to potential silvicultural models, risks and limitations of planting BN1 and other superior N. cadamba varieties.","PeriodicalId":63552,"journal":{"name":"林学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48312518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ana María Monsalve-Cuartas, F. Rego, Mamerto Antonio Gregorio Vásquez
Tikuna indigenous believe that the saltlicks are natural sacred spaces in the Amazon Rainforest. Those are health and nutrition spaces of important species of fauna, especially mammals and birds. The perception, knowledge, usage and spiritual management of saltlicks for Tikuna help the conservation of more than 130 species of flora identified in forest inventories. Saltlicks forests have few studies in the Colombian Amazon region. The objective of this study was to identify and compare the composition and structure in a sample of 6 saltlicks, and control forests, present in the perimeter of each one of them, to know if they have similarities or differences. The genres (or species as far as possible) and frequent botanical families were identified. The information was obtained through fieldwork with inventories carried out in the saltlicks and control forests in the years 2015, 2016 and 2017, with the help of local guides and knowledgeable people about flora of Tikuna community (Gregorio family, Cascabel clan), San Martin de Amacayacu village, TICOYA resguardos. In the saltlicks sample, 336 trees in 29 families were identified. The families with more number of trees are Arecaceae, Myristicaceae and Fabaceae. In control forests 345 trees in 27 families were identified; the families with more number of trees are Arecaceae, Myristicaceae, and Sapotaceae. Control forests present a little higher value of richness and diversity that saltlick forests, but they are not statistically significant. The family Arecaceae is the one that predominates in the 6 saltlicks and control forests inventories without being dominant. Control forests have higher values of richness and diversity, but they are not statistically significant. In both samples of inventoried forests, they have little dominance of species. Their species have equity in the saltlicks and control forests.
蒂库纳土著人认为，盐沼是亚马逊雨林中的天然圣地。它们是重要动物物种，特别是哺乳动物和鸟类的健康和营养空间。蒂库纳盐沼的认知、知识、使用和精神管理有助于保护森林调查中确定的130多种植物。哥伦比亚亚马逊地区的盐碱地森林鲜有研究。本研究的目的是识别和比较6个盐沼样本的组成和结构，并控制森林，存在于每个盐沼的周围，以了解它们是否有相似或不同之处。鉴定了植物的类型(或种)和常见的植物科。这些信息是在当地导游和Tikuna社区(Gregorio家族、Cascabel家族)、San Martin de Amacayacu村、TICOYA警卫的帮助下，于2015年、2016年和2017年在盐沼和控制林进行的实地调查中获得的。在盐盐样本中，鉴定了29个家族的336棵树。树数较多的科为槟榔科、肉豆蔻科和豆科。在对照林中鉴定出27科345株树木;树数较多的科是槟榔科、肉豆蔻科和槐树科。对照林的丰富度和多样性值略高于盐渍林，但差异不显著。槟榔科在6个盐沼中占主导地位，并控制森林库存，但不占主导地位。对照林的丰富度和多样性值较高，但差异不具有统计学意义。在调查的两个森林样本中，它们几乎没有物种优势。他们的物种在盐沼和控制森林中享有平等。
{"title":"Comparative Analysis of Composition and Biodiversity of Saltlicks Forest and Control Forests, TICOYA Resguardo, Tikuna Indigenous Community, San Martin de Amayacu Sector (Colombia Amazonian Trapeze)","authors":"Ana María Monsalve-Cuartas, F. Rego, Mamerto Antonio Gregorio Vásquez","doi":"10.4236/ojf.2019.94020","DOIUrl":"https://doi.org/10.4236/ojf.2019.94020","url":null,"abstract":"Tikuna indigenous believe that the saltlicks are natural sacred spaces in the Amazon Rainforest. Those are health and nutrition spaces of important species of fauna, especially mammals and birds. The perception, knowledge, usage and spiritual management of saltlicks for Tikuna help the conservation of more than 130 species of flora identified in forest inventories. Saltlicks forests have few studies in the Colombian Amazon region. The objective of this study was to identify and compare the composition and structure in a sample of 6 saltlicks, and control forests, present in the perimeter of each one of them, to know if they have similarities or differences. The genres (or species as far as possible) and frequent botanical families were identified. The information was obtained through fieldwork with inventories carried out in the saltlicks and control forests in the years 2015, 2016 and 2017, with the help of local guides and knowledgeable people about flora of Tikuna community (Gregorio family, Cascabel clan), San Martin de Amacayacu village, TICOYA resguardos. In the saltlicks sample, 336 trees in 29 families were identified. The families with more number of trees are Arecaceae, Myristicaceae and Fabaceae. In control forests 345 trees in 27 families were identified; the families \u0000with more number of trees are Arecaceae, Myristicaceae, and Sapotaceae. Control forests present a little higher value of richness and diversity that saltlick forests, but they are not statistically significant. The family Arecaceae is the one that predominates in the 6 saltlicks and control forests inventories without being dominant. Control forests have higher values of richness and diversity, but they are not statistically significant. In both samples of inventoried forests, they have little dominance of species. Their species have equity in the saltlicks and control forests.","PeriodicalId":63552,"journal":{"name":"林学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48363797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Paudel, K. R. Tiwari, N. Raut, B. Sitaula, P. Poudel
Agroforestry practice is becoming compassionate option for rural communities to fulfil basic needs and generate income for households’ wellbeing. Gender consideration seems worthful to obtain optimum benefits from agroforestry practices in the scarcity of male labour in the locality. This paper has attempted to analyse tendency of gendered participation in agroforestry practice and their existence in gaining benefits. We selected three mid-hills districts of Nepal where people are adopting both traditional (fulfilling subsistence needs) and improved (commercial purpose along with fulfilling subsistence needs) practices. We organized focused group discussions (n = 9), randomly sampled (n = 420) households for interview from each practice (n = 210) to analyse gendered wise participation in farm establishment, management intervention, capacity building and access to information, known as major agroforestry promoting activities. Key informant interview (n = 18), focused group discussions (n = 9), randomly sampled (n = 420) households for interview from each practice (n = 210) was organized to analyse gendered wise participation in farm establishment, management intervention, capacity building and access to information, known as major agroforestry promoting activities. Women participation seemed to be higher in establishment activities than male in traditional practices whereas males were front in applying chemical fertilizer and pesticides and irrigation in improved practices. While changing in practices from traditional to improved, male participation during land tillage found to be significant. Male domination was observed in making decisions regarding species selection in traditional practices whereas women domination was observed in improved practices. Men’s involvement in species selection and plantation was found significant with changing in practices from traditional to improved. Men were ahead in capacity building and skill development activities in traditional practices but women were more active in improved practices. Women participation in training and meetings was found significant between traditional and improved practice. Neighbours were major source of information in traditional whereas extension workers/programmes were major bases to learn new ideas and techniques to improved practitioner. Technologies and learning environment are less friendly to women so they have limited access to adopt new technologies. Exploration of gendered friendly programme and technologies is recommended to promote improved practices and maximize benefits from agroforestry.
{"title":"Agroforestry Practices in Midhills of Nepal from Gender Perspective","authors":"D. Paudel, K. R. Tiwari, N. Raut, B. Sitaula, P. Poudel","doi":"10.4236/ojf.2019.94018","DOIUrl":"https://doi.org/10.4236/ojf.2019.94018","url":null,"abstract":"Agroforestry practice is becoming compassionate option for rural communities to fulfil basic needs and generate income for households’ wellbeing. Gender consideration seems worthful to obtain optimum benefits from agroforestry practices in the scarcity of male labour in the locality. This paper has attempted to analyse tendency of gendered participation in agroforestry practice and their existence in gaining benefits. We selected three mid-hills districts of Nepal where people are adopting both traditional (fulfilling subsistence needs) and improved (commercial purpose along with fulfilling subsistence needs) practices. We organized focused group discussions (n = 9), randomly sampled (n = 420) households for interview from each practice (n = 210) to analyse gendered wise participation in farm establishment, management intervention, capacity building and access to information, known as major agroforestry promoting activities. Key informant interview (n = 18), focused group discussions (n = 9), randomly sampled (n = 420) households for interview from each practice (n = 210) was organized to analyse gendered wise participation in farm establishment, management intervention, capacity building and access to information, known as major agroforestry promoting activities. Women participation seemed to be higher in establishment activities than male in traditional practices whereas males were front in applying chemical fertilizer and pesticides and irrigation in improved practices. While changing in practices from traditional to improved, male participation during land tillage found to be significant. Male domination was observed in making decisions regarding species selection in traditional practices whereas women domination was observed in improved practices. Men’s involvement in species selection and plantation was found significant with changing in practices from traditional to improved. Men were ahead in capacity building and skill development activities in traditional practices but women were more active in improved practices. Women participation in training and meetings was found significant between traditional and improved practice. Neighbours were major source of information in traditional whereas extension workers/programmes were major bases to learn new ideas and techniques to improved practitioner. Technologies and learning environment are less friendly to women so they have limited access to adopt new technologies. Exploration of gendered friendly programme and technologies is recommended to promote improved practices and maximize benefits from agroforestry.","PeriodicalId":63552,"journal":{"name":"林学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44357096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mac Thi Yen, Shiping Xing, Hairong Han, Xiaoqin Cheng, D. Thao, S. Hussain, Sher Shah
The present study was conducted to examine the distributional characteristics of floral communities along the altitudinal gradients in Hoang Lien National Park (HLNP), located in Lao Cai province, Vietnam. We recorded the relatively abundant flora system with 3252 species (including 361 endemic species and 237 endangered species), belonging to 1126 genera, 230 families and 6 different phyla. Methodology of sampling, specimen collection and identification, statistical analysis are simultaneously used for investigating the complex changes of composition and richness of plant assemblages. The study results indicated the divisions in quantity and composition, especially differentiation of endemic and rare species in accordance with altitudinal gradients.
{"title":"Distribution of Vascular Plants along Altitudinal Gradients in Hoang Lien National Park, Vietnam","authors":"Mac Thi Yen, Shiping Xing, Hairong Han, Xiaoqin Cheng, D. Thao, S. Hussain, Sher Shah","doi":"10.4236/ojf.2019.94023","DOIUrl":"https://doi.org/10.4236/ojf.2019.94023","url":null,"abstract":"The present study was conducted to examine the distributional characteristics of floral communities along the altitudinal gradients in Hoang Lien National Park (HLNP), located in Lao Cai province, Vietnam. We recorded the relatively abundant flora system with 3252 species (including 361 endemic species and 237 endangered species), belonging to 1126 genera, 230 families and 6 different phyla. Methodology of sampling, specimen collection and identification, statistical analysis are simultaneously used for investigating the complex changes of composition and richness of plant assemblages. The study results indicated the divisions in quantity and composition, especially differentiation of endemic and rare species in accordance with altitudinal gradients.","PeriodicalId":63552,"journal":{"name":"林学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49128197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Félix, Atsoumpari Ngakabi Létycia Adeline, Ndzai Saint Fédriche, I. Averti
The factors influencing the distribution of forests and their development are important in order to better understand the bio-functioning of tropicals ecosystems forests. The Republic of the Congo has an important forest area of 23.5 million ha subdivided into three large massifs with different forest units from the north until the south of the country. The present study proposes to highlight the relationship between the edaphic and pedological factors and the distribution of the floristic species of some tropical forests of the Congo. To achieve this aim, a principal component analysis (PCA) was to identify similarities or oppositions between variables and to locate the most correlated variables. Also, the indices of biodiversities were used to assess the biodiversity between forest plot and forest sites. A total of 238 species distributed in 46 families were counted. We noted a CS similarity between Mbomo-Kelle and FMU Mokabi-Dzanga of 50%. However, there was considerable variability between the forests of the Impfondo-Dongou axis and of the forest of other localities. The main component analysis carried out showed that the distribution of floristic species in the studied forests is determined by the edaphic factors.
{"title":"Relationship between Tropical Forest Distribution and Soils on Different Types of Mother Rocks in the Republic of Congo","authors":"K. Félix, Atsoumpari Ngakabi Létycia Adeline, Ndzai Saint Fédriche, I. Averti","doi":"10.4236/ojf.2019.94019","DOIUrl":"https://doi.org/10.4236/ojf.2019.94019","url":null,"abstract":"The factors influencing the distribution of forests and their development are important in order to better understand the bio-functioning of tropicals ecosystems forests. The Republic of the Congo has an important forest area of 23.5 million ha subdivided into three large massifs with different forest units from the north until the south of the country. The present study proposes to highlight the relationship between the edaphic and pedological factors and the distribution of the floristic species of some tropical forests of the Congo. To achieve this aim, a principal component analysis (PCA) was to identify similarities or oppositions between variables and to locate the most correlated variables. Also, the indices of biodiversities were used to assess the biodiversity between forest plot and forest sites. A total of 238 species distributed in 46 families were counted. We noted a CS similarity between Mbomo-Kelle and FMU Mokabi-Dzanga of 50%. However, there was considerable variability between the forests of the Impfondo-Dongou axis and of the forest of other localities. The main component analysis carried out showed that the distribution of floristic species in the studied forests is determined by the edaphic factors.","PeriodicalId":63552,"journal":{"name":"林学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41967459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The vegetative growth of rubber tree is an important basis for rubber tree cultivation and economic management. Stem diameter and height growth patterns of rubber seedlings and the seasonal variability are still poorly understood. Studying the annual growth patterns and seasonal variation of rubber seedling will help understanding biological characteristics of rubber tree and provide a reference for field cultivation and management. Height growth and stem diameter of field-sown rubber seedlings cultivation and polybag-raised cultivation all displayed a distinct annual pattern of “slow-fast-slow”. Height growth and stem diameter growth response fitted the logistic equation preferably, supporting the observed pattern. Fast-growth of plant height for polybag-raised rubber seedlings cultivation and field-sown rubber seedlings cultivation occurred from June to November and May to November, respectively. This period saw the greatest accumulations of plant height growth for polybag-raised rubber seedlings cultivation and field-sown rubber seedlings cultivation accounting for 83.99% and 86.65% of total growth, respectively. Fast-growth of stem diameter for polybag-raised rubber seedlings cultivation and field-sown rubber seedlings cultivation occurred from June to November and May to November, respectively. This period saw the greatest accumulations of stem growth for polybag-raised rubber seedlings cultivation and field-sown rubber seedlings cultivation accounting for 86.71% and 84.60% of total growth, respectively. Polybag-raised rubber seedlings cultivation and field-sown rubber seedlings cultivation for the whole year had nine extension units and each month had one extension unit from May to November. Extension unit of for the whole year did not stop period and plant height growth rate has the seasonal difference. However, leaf phenophase of field-sown rubber seedlings cultivation was earlier than that of polybag-raised rubber seedlings cultivation and each extension unit of field-sown rubber seedlings cultivation was greater than that of poly-bag-raised rubber seedlings cultivation. The precipitation had the greatest impact on seedlings growth under different cultivation. There was no period annually in which height growth and stem diameter growth did not occur and the fastest growth occurred during the rainy season. Plant height and stem diameter of rubber seedlings under different cultivation showed isogony phenomenon. Extension unit and leaf phenophase of polybag-raised rubber seedlings and field-sown rubber seedlings showed consistency and synchronization characteristic. Different cultivation of rubber seedling should take corresponding measures tending management and operation.
{"title":"Seasonal Changes Impact on Growth of Rubber (Hevea brasiliensis) Seedlings under Different Cultivation","authors":"Dongling Qi, Guishui Xie, Zhixiang Wu","doi":"10.4236/ojf.2019.94022","DOIUrl":"https://doi.org/10.4236/ojf.2019.94022","url":null,"abstract":"The vegetative growth of rubber tree is an important basis for rubber tree cultivation and economic management. Stem diameter and height growth patterns of rubber seedlings and the seasonal variability are still poorly understood. Studying the annual growth patterns and seasonal variation of rubber seedling will help understanding biological characteristics of rubber tree and provide a reference for field cultivation and management. Height growth and stem diameter of field-sown rubber seedlings cultivation and polybag-raised cultivation all displayed a distinct annual pattern of “slow-fast-slow”. Height growth and stem diameter growth response fitted the logistic equation preferably, supporting the observed pattern. Fast-growth of plant height for polybag-raised rubber seedlings cultivation and field-sown rubber seedlings cultivation occurred from June to November and May to November, respectively. This period saw the greatest accumulations of plant height growth for polybag-raised rubber seedlings cultivation and field-sown rubber seedlings cultivation accounting for 83.99% and 86.65% of total growth, respectively. Fast-growth of stem diameter for polybag-raised rubber seedlings cultivation and field-sown rubber seedlings cultivation occurred from June to November and May to November, respectively. This period saw the greatest accumulations of stem growth for polybag-raised rubber seedlings cultivation and field-sown rubber seedlings cultivation accounting for 86.71% and 84.60% of total growth, respectively. Polybag-raised rubber seedlings cultivation and field-sown rubber seedlings cultivation for the whole year had nine extension units and each month had one extension unit from May to November. Extension unit of for the whole year did not stop period and plant height growth rate has the seasonal difference. However, leaf phenophase of field-sown rubber seedlings cultivation was earlier than that of polybag-raised rubber seedlings cultivation and each extension unit of field-sown rubber seedlings cultivation was greater than that of poly-bag-raised rubber seedlings cultivation. The precipitation had the greatest impact on seedlings growth under different cultivation. There was no period annually in which height growth and stem diameter growth did not occur and the fastest growth occurred during the rainy season. Plant height and stem diameter of rubber seedlings under different cultivation showed isogony phenomenon. Extension unit and leaf phenophase of polybag-raised rubber seedlings and field-sown rubber seedlings showed consistency and synchronization characteristic. Different cultivation of rubber seedling should take corresponding measures tending management and operation.","PeriodicalId":63552,"journal":{"name":"林学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42401411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Big Basal Area Factor (Big BAF) and Point-3P are two-stage sampling methods. In the first stage the sampling units, in both methods, are Bitterlich points where the selection of the trees is proportional to their basal area. In the second stage, sampling units are trees which are a subset of the first stage trees. In the Big BAF method, the probability of selecting trees in the second stage is made proportional to the two BAFs’ ratio, with a basal area factor larger than that of the first stage. In the Point-3P method the probability of selecting trees, in the second stage, is based on the height prediction and use of a specific random number table. Estimates of the forest stands’ volume and their sampling errors are based on the theory of the product of two random variables. The increasing error in the second stage is small, but the total cost of measuring the trees is much smaller than simply using the first stage, with all the trees measured. In general, the two sampling methods are modern and cost-effective approaches that can be applied in forest stand inventories for forest management purposes and are receiving the growing interest of researchers in the current decade.
{"title":"Two Contemporary and Efficient Two-Stage Sampling Methods for Estimating the Volume of Forest Stands: A Brief Overview and Unified Mathematical Description","authors":"Aristeidis Georgakis, G. Stamatellos","doi":"10.4236/OJF.2019.93013","DOIUrl":"https://doi.org/10.4236/OJF.2019.93013","url":null,"abstract":"Big Basal Area Factor (Big BAF) and Point-3P are two-stage sampling methods. In the first stage the sampling units, in both methods, are Bitterlich points where the selection of the trees is proportional to their basal area. In the second stage, sampling units are trees which are a subset of the first stage trees. In the Big BAF method, the probability of selecting trees in the second stage is made proportional to the two BAFs’ ratio, with a basal area factor larger than that of the first stage. In the Point-3P method the probability of selecting trees, in the second stage, is based on the height prediction and use of a specific random number table. Estimates of the forest stands’ volume and their sampling errors are based on the theory of the product of two random variables. The increasing error in the second stage is small, but the total cost of measuring the trees is much smaller than simply using the first stage, with all the trees measured. In general, the two sampling methods are modern and cost-effective approaches that can be applied in forest stand inventories for forest management purposes and are receiving the growing interest of researchers in the current decade.","PeriodicalId":63552,"journal":{"name":"林学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45567896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Considering the high abundance of knotweeds along river courses, the expected increase of invasion and the consequent negative impacts on riparian ecosystems, there is a high demand for innovative approaches and management strategies. While a primary aim of weed management is to reduce the population of an invasive plant species, the goal of the pre-sented nature-based engineering solution (NABES) is to reinstall native riparian forests and to restore ecosystem functioning. The concept of NABES is to support the implemented species by frequent removal of the knotweed shoots until the native vegetation represses the knotweeds by root competition and shadow pressure. In order to be able to develop adaptive knotweed management strategies, knowledge concerning sea-sonal biomass development and the most effective maintenance intervals must be improved. Additionally, greater understanding of the interaction between invasive and native species is essential. In the present study, the effectiveness of a willow brush mattress (a frequent technique for controlling riverbank erosion) in combination with adapted management strategies was tested on a Fallopia japonica-dominated brook embankment. Due to its high ecological amplitude and excellent soil bioengineering properties the species S. purpurea was used. In the upper part of the embankment, F. japonica shoot production was by far the strongest, while it was low in the sections next to the water. The strongest biomass production was observed in the months April and May. Even though the temporal interval between shoot removal was increased, shoot production decreased strongly and nearly ceased in August. Branches of S. purpurea with contact to the water of the brook showed good development. In contrast to F. japonica, which suffered a rapid decrease in biomass production after the third survey, the coverage ratio of S. purpurea decreased gradually over the vegetation period.
{"title":"A Case Study: The Implementation of a Nature-Based Engineering Solution to Restore a Fallopia japonica-Dominated Brook Embankment","authors":"S. Hoerbinger, H. Rauch","doi":"10.4236/OJF.2019.93009","DOIUrl":"https://doi.org/10.4236/OJF.2019.93009","url":null,"abstract":"Considering the high abundance of knotweeds along river courses, the expected increase of invasion and the consequent negative impacts on riparian ecosystems, there is a high demand for innovative approaches and management strategies. While a primary aim of weed management is to reduce the population of an invasive plant species, the goal of the pre-sented nature-based engineering solution (NABES) is to reinstall native riparian forests and to restore ecosystem functioning. The concept of NABES is to support the implemented species by frequent removal of the knotweed shoots until the native vegetation represses the knotweeds by root competition and shadow pressure. In order to be able to develop adaptive knotweed management strategies, knowledge concerning sea-sonal biomass development and the most effective maintenance intervals must be improved. Additionally, greater understanding of the interaction between invasive and native species is essential. In the present study, the effectiveness of a willow brush mattress (a frequent technique for controlling riverbank erosion) in combination with adapted management strategies was tested on a Fallopia japonica-dominated brook embankment. Due to its high ecological amplitude and excellent soil bioengineering properties the species S. purpurea was used. In the upper part of the embankment, F. japonica shoot production was by far the strongest, while it was low in the sections next to the water. The strongest biomass production was observed in the months April and May. Even though the temporal interval between shoot removal was increased, shoot production decreased strongly and nearly ceased in August. Branches of S. purpurea with contact to the water of the brook showed good development. In contrast to F. japonica, which suffered a rapid decrease in biomass production after the third survey, the coverage ratio of S. purpurea decreased gradually over the vegetation period.","PeriodicalId":63552,"journal":{"name":"林学期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45461552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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