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Does Tenure Matters? Assessment of Stand Parameters in Ngitili Management System in Meatu District Tanzania 终身教职重要吗?坦桑尼亚Meatu地区Ngitili管理系统林分参数评价
Pub Date : 2023-02-14 DOI: 10.37284/eajfa.6.1.1089
B. J. Manyanda
Despite the fact that forests in Ngitili are managed under private and communal tenure regimes, few studies exists that shows how those tenure regimes have influenced forest conditions. The present study assessed stand structure, i.e., diameter and species distribution, basal area, density, and volume in the Ngitili management system under private and communal tenure regimes. A systematic random sampling approach was used to establish circular plots measuring 15 m radius across three Ngitili selected in the study area in which data were collected. R software was used to analyze the collected data sets. Results show that the number of stems (N) basal area (G) and volume (V) per hectare was 3 197.67 stems/ha, 6.92 m2/ha and 36.04 m3, respectively under the private tenure regime. Additionally, N, G and V varied from 572.99 - 1213.73 stems/ha, 5.22 - 6.67 m2/ha and 16.67 - 18.06 m3, respectively in the communal tenure regime. However, diameter distribution of 10 – 20 cm and below 10 cm contributed more to the observed V and N, respectively both in the private and communal tenure regime. Interestingly, diameter distributions showed a negative exponential function of De Liocourt i.e. Inverse J shaped indicating normal trend in an unevenly aged natural forest. On the other hand, the study revealed the Shannon-Wiener diversity Index ranging from 0.99 – 1.88 in communal Ngitili and 1.90 in private Ngitili indicating low species diversity. Generally, N and V in Ngitili under the private tenure regime were better than under the communal tenure regime. However, no significant difference in basal area and tree species diversity was observed between private and communal tenure regimes in Ngitili management systems. The findings presented here can be used in planning the future restoration of degraded ecosystems and for forest management.
尽管Ngitili的森林是在私人和公共权属制度下管理的,但很少有研究表明这些权属制度如何影响森林条件。本研究评估了在私人和公共权属制度下黑木林分管理系统的林分结构,即直径和物种分布、基底面积、密度和体积。采用系统随机抽样方法,在收集数据的研究区域内选择三个Ngitili,建立半径为15 m的圆形样地。采用R软件对收集的数据集进行分析。结果表明:在私人权属下,每公顷茎数(N)、基面积(G)和体积(V)分别为3 197.67茎/ha、6.92 m2/ha和36.04 m3;此外,在公有土地制度下,N、G和V分别在572.99 ~ 1213.73茎/ha、5.22 ~ 6.67 m2/ha和16.67 ~ 18.06 m3之间变化。然而,10 ~ 20 cm和10 cm以下的直径分布分别对观测到的V和N贡献更大,在私人和公共权属制度下。有趣的是,在年龄不均匀的天然林中,直径分布呈De Liocourt的负指数函数,即逆J形,表明正常趋势。群落群落的Shannon-Wiener多样性指数为0.99 ~ 1.88,群落群落的Shannon-Wiener多样性指数为1.90,表明群落群落的物种多样性较低。一般而言,私人保有制度下Ngitili的N和V优于公共保有制度下的N和V。然而,在私人权属和公共权属管理系统中,基带面积和树种多样性没有显著差异。这里提出的研究结果可用于规划未来退化生态系统的恢复和森林管理。
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引用次数: 0
Is Fair Benefit Sharing a Reality or A Fallacy? Implications for Effective Collaborative Forest Management at Echuya Central Forest Reserve, S. W. Uganda 公平利益分享是现实还是谬误?乌干达西南部Echuya中央森林保护区有效协同森林管理的启示
Pub Date : 2023-02-10 DOI: 10.37284/eajfa.6.1.1083
S.G. Bugabo, R. Bitariho, M. Twinamatsiko
It is generally accepted that equitable benefits sharing from protected areas (PAs) is a probable technique for both sustainable management and PA conservation. Evidence however, suggests that this might not be entirely true since such benefits might not be equitably shared among local communities as they would have wished. This research compares benefits received by Collaborative Forest Management (CFM) community members with those of non-CFM community members adjacent to Echuya Central Forest Reserve (ECFR). The study further assesses the most preferred benefits by local community members around ECFR and the perceived barriers to equitable benefit sharing. It provides insight into how benefit sharing under CFM influences the conservation of protected areas. We conducted 458 household interviews, 26 key informant interviews and 4 focus group discussions to obtain data from CFM and non-CFM community members, government institutions, conservation organisations and local community leaders around ECFR. Benefits received by community members include access to firewood, grass, medicinal plants, materials to make ropes, honey and bamboo rhizomes, livelihood project support, cash benefits and training. The preferred benefits in their descending order include agricultural support, financial support, ecotourism, and livestock farming. The failure to monitor the implementation of CFM activities and corruption hinder equitable benefit sharing and promote overexploitation of forest resources. This study recommends that the National Forestry Authority (NFA) should include forest-adjacent communities in budget frameworks in order to provide financial support for CFM activities. The NFA and conservation organisations working around ECFR need to enhance the monitoring of CFM activities to ensure transparency and equitable sharing of forest resources
人们普遍认为,公平分享保护区的利益可能是可持续管理和保护保护区的一种技术。然而,有证据表明,这可能并不完全正确,因为这些利益可能不会像当地社区所希望的那样在他们之间公平地分享。本研究比较了峨楚亚中央森林保护区(ECFR)附近合作性森林管理(CFM)社区成员与非合作性森林管理社区成员的收益。该研究进一步评估了当地社区成员在ECFR周围最喜欢的利益,以及公平利益分享的感知障碍。它提供了关于在CFM下利益分享如何影响保护区保护的见解。我们进行了458个家庭访谈、26个关键信息提供者访谈和4个焦点小组讨论,以获取CFM和非CFM社区成员、政府机构、保护组织和当地社区领导人关于ECFR的数据。社区成员获得的福利包括获得木柴、草、药用植物、绳索制作材料、蜂蜜和竹根茎、生计项目支持、现金福利和培训。优先考虑的效益依次为农业支持、金融支持、生态旅游和畜牧业。未能监测CFM活动的实施和腐败阻碍了公平的利益分享,并促进了森林资源的过度开发。本研究建议国家林业局(NFA)应将森林邻近社区纳入预算框架,以便为CFM活动提供财政支持。国家森林管理局和围绕ECFR开展工作的保护组织需要加强对CFM活动的监测,以确保森林资源的透明度和公平共享
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引用次数: 0
The Trends and Magnitude of Tree Plantation Growing in Rural Communities of Kigezi Sub-region, South Western Uganda 乌干达西南部基盖齐次区域农村社区人工林生长趋势和规模
Pub Date : 2023-02-03 DOI: 10.37284/eajfa.6.1.1073
J. T. Tumushabe, Bariyo Rogers, Brain Bwanika, R. Twongyirwe
The study documents the trends and magnitude of tree plantation growth in the Kigezi Sub-region of South Western Uganda. In most developing countries, national governments have been promoting and supporting rural communities with tree-planting programs in the region. A trend analysis was used to determine the escalating tree plantation growth in the sub-region. Landsat (TM/ETM+) satellite images were used to capture the trends, and a survey was also used to obtain information on the distribution patterns of established tree plantations. A randomly selected sample of 389 tree plantation growers was surveyed. The research approaches adopted were to supplement and strengthen the findings and also to provide an opportunity for the researcher to understand in-depth how tree plantations grow in the rural livelihood economy. Recommendations from this study emphasise the strengthening of the existing policy reforms. Also, interventions to harness sustainable forestry management should be used to provide integrated benefits to all, ranging from safeguarding local livelihoods to protecting the biodiversity and ecosystems provided by forests and reducing rural poverty in the Kigezi sub-region
该研究记录了乌干达西南部基盖齐分区域树木种植的增长趋势和规模。在大多数发展中国家,国家政府一直在通过该地区的植树项目促进和支持农村社区。采用趋势分析方法确定了该次区域人工林生长呈上升趋势。利用陆地卫星(TM/ETM+)卫星图像捕捉趋势,并利用一项调查获得关于已建立的人工林分布格局的信息。随机抽样调查了389名人工林种植者。所采用的研究方法是为了补充和加强研究结果,也为研究人员提供了一个深入了解农村生计经济中人工林如何生长的机会。这项研究的建议强调加强现有的政策改革。此外,应利用利用可持续森林管理的干预措施为所有人提供综合利益,从保护当地生计到保护森林提供的生物多样性和生态系统,以及减少基盖齐分区域的农村贫困
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引用次数: 0
The Contribution of Traditional Agroforestry Systems and Challenges of Adoption by Smallholder Farmers in Ethiopia. A review 埃塞俄比亚传统农林业系统的贡献和小农采用农林业系统的挑战。回顾
Pub Date : 2023-01-18 DOI: 10.37284/eajfa.6.1.1051
Sewale Wondimenh
Agroforestry is a system of land use that incorporates the use of trees with either crops, livestock, or both. In Ethiopia, traditional agroforestry systems such as home gardens, parkland, border planting, woodlots, coffee-based, enset-based, and fruit-based systems have been used. Therefore, the goal of this review study was to gather, arrange, and analyse traditional agroforestry systems’ social, economic, and environmental contributions as well as the factors influencing their uptake. In Ethiopia, traditional agroforestry systems enhanced biodiversity and improved the livelihood of the society by providing cash income, fuelwood, pole, timber, fencing, indigenous medicines and food. Additionally, they increase soil fertility and restore biomass carbon in the range of 12 to 228 Mg ha⁻1. Despite their importance, a variety of factors have prevented farmers from implementing these agroforestry techniques. They include the uncertainty of tenure, the availability of land, the age of the family’s leader, labour, gender, degree of education, access to training, and the availability of water. Therefore, it is important to encourage agroforestry practices in order to increase production, raise soil carbon stocks, and conserve biodiversity. This can be done through offering training, equitable land sharing, and institutional stability
农林业是一种土地利用系统,将树木与作物、牲畜或两者结合使用。在埃塞俄比亚,传统的农林业系统,如家庭花园、公园、边界种植、林地、以咖啡为基础、以嵌套为基础和以水果为基础的系统已经被使用。因此,本综述研究的目的是收集、整理和分析传统农林复合系统的社会、经济和环境贡献以及影响其吸收的因素。在埃塞俄比亚,传统农林业系统通过提供现金收入、薪材、杆子、木材、围栏、土著药品和食品,增强了生物多样性,改善了社会生计。此外,它们还能提高土壤肥力,恢复12 - 228 Mg ha - 1的生物量碳。尽管它们很重要,但各种因素阻碍了农民实施这些农林业技术。这些因素包括权属的不确定性、土地的可得性、家庭领袖的年龄、劳动力、性别、教育程度、接受培训的机会和水的可得性。因此,为了增加产量、增加土壤碳储量和保护生物多样性,鼓励农林业实践非常重要。这可以通过提供培训、公平的土地分享和制度稳定来实现
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引用次数: 0
Distribution, Conservation Status and Effects of Threats on Relative Abundance of Warburgia ugandensis Tree Species. A Case Study of Katimok Forest Reserve, Kenya 乌干达华柏树种分布、保护现状及威胁对其相对丰度的影响以肯尼亚卡蒂莫克森林保护区为例
Pub Date : 2023-01-11 DOI: 10.37284/eajfa.6.1.1044
Dub Isacko Dokata, B. Mburu, G. Macharia, Simon Kosgey Choge, Samson Okoth Ojunga, Basil Okoth Kaudo
Forest ecosystems provide livelihood opportunities such as medicines, fuelwood, timber, cash income and a reliable supply of groundwater. However, encroachment of forests by human settlement adjacent to conservation areas is associated with overharvesting of forest resources and uncontrolled livestock grazing leading to the destruction and disappearance of useful plant species in forest ecosystems which can significantly affect both biodiversity integrity and ecological functioning. Therefore, this study aimed to investigate the distribution, conservation status, and effects of threats on the relative abundance of Warburgia ugandensis in Katimok Forest Reserve, Baringo County in Kenya. Data collection was done using transect lines and quadrat methods. The data on the relative abundance of Warburgia ugandensis and indicators of threat were collected from quadrats and sub-quadrats located at 50 m, 350 m and 650 m from the forest edge. In addition, other measures of tree growth such as diameter at breast height (DBH) and heights of mature trees in the study blocks were made. One-way ANOVA was used to analyse the relative abundance of Warburgia ugandensis, indicators of threat and growth parameters. Pearson correlation results revealed a significant relationship between debarked and mature Warburgia ugandensis (r = 0.95; df=2, P=0.019), grazing intensities, and number of seedlings/saplings (r = 0.96; df=2, P=0.017) and other indicators of threats (stumps, defoliated leaves, broken twigs/branches) and the abundance of Warburgia ugandensis (r = 0.97; df=2, p=0.015). Therefore, there is an urgent need to map out the distribution of Warburgia ugandensis in the whole country to know where it is abundant in order to draw a national conservation and management plan for the tree species.
森林生态系统提供生计机会,如药品、薪材、木材、现金收入和可靠的地下水供应。然而,毗邻保护区的人类住区对森林的侵占与森林资源的过度采伐和不受控制的牲畜放牧有关,导致森林生态系统中有用植物物种的破坏和消失,这可能严重影响生物多样性的完整性和生态功能。因此,本研究旨在调查肯尼亚巴林戈县Katimok森林保护区乌干达沃布贾(Warburgia乌干达)的分布、保护现状及威胁对其相对丰度的影响。数据采集采用样条线法和样方法。在距离森林边缘50 m、350 m和650 m的样方和亚样方上采集乌干达白檀相对丰度和威胁指标数据。此外,还测量了树木生长的其他指标,如胸径(DBH)和研究区域内成熟树木的高度。采用单因素方差分析方法对乌干达沃布贾的相对丰度、威胁指标和生长参数进行分析。Pearson相关分析结果显示,脱皮和成熟的乌干达瓦布吉(Warburgia ugandensis)呈显著相关(r = 0.95;df=2, P=0.019)、放牧强度和幼苗/树苗数量(r = 0.96;df=2, P=0.017),其他威胁指标(树桩、落叶、断枝/断枝)和乌干达瓦布吉(Warburgia ugandensis)丰度(r = 0.97;df = 2, p = 0.015)。因此,迫切需要绘制乌干达瓦布贾在全国的分布情况,了解其丰富的地方,以便制定国家树种保护和管理计划。
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引用次数: 0
Factors Influencing Household Tree Planting Behaviour. A Case Study of Wangchieng Ward, Homabay County 影响家庭植树行为的因素。以霍马贝县望青区为例
Pub Date : 2022-12-28 DOI: 10.37284/eajfa.5.1.1028
Basil Okoth Kaudo, Antony Ondiwa Okundi, Patrick Mwenja, E. I. Ejore, Jesse O. Owino
The ever-increasing impacts of climate change in sub-Saharan Africa have made many aware and struggle with livelihood options from nature, and the need for households and communities to plant trees can no longer be over-emphasised. Community tree planting is crucial for global environmental sustainability. The information that guided the public in selecting the tree they plant in their private spaces is important, especially to policymakers. This paper was aimed at analysing the factors that influence community tree planting behaviour. The study used a mixed-methods approach that involved both qualitative research using focus groups as well as quantitative research using questionnaires administered to the residents of the ten locations in Wangchieng ward: Homabay County in December 2021. A sample of 380 community households was selected, 38 in each location, through purposive sampling technique and mixed structured questionnaires delivered to them. The questionnaires assessed community attitudes and conservation involvement against the socioeconomic background, benefits, and costs of planting trees. Results showed that most residents of Wangchieng ward have positive attitudes towards tree planting. The data collected from the questionnaires showed that socioeconomic factors such as age, education levels and income were positively related to participation in community tree-planting programs among respondents. A stepwise binary logistics conducted ranked six variables as the major factors influencing household tree planting. The importance of trees was ranked at position one (most influential variable) with an odd ratio of 9.287, and at position six was education level with an odd ratio of 1.207. The full model containing all the variables was statistically significant at χ2 (10, N = 370) = 98.312, p < .001, clearly indicating that the model was able to distinguish respondents who have planted and those who have not planted trees in the last six months. Thus, it is recommended that household tree planting can significantly be enhanced by improving knowledge on the importance of trees, their various ecosystem goods and services, making seedlings cheaply available for households as well as promoting households to do agroforestry in their farmers
在撒哈拉以南非洲,气候变化的影响日益加剧,使许多人意识到并努力寻找来自大自然的生计选择,家庭和社区植树的必要性再怎么强调也不为过。社区植树对全球环境的可持续性至关重要。引导公众选择他们在私人空间种植的树木的信息很重要,尤其是对政策制定者来说。本文旨在分析影响社区植树行为的因素。该研究采用了混合方法,包括使用焦点小组的定性研究和使用问卷调查的定量研究,于2021年12月对霍马贝县望青区十个地点的居民进行了调查。通过有目的抽样技术和混合结构化问卷的方式,选取380个社区家庭,每个地区38个。调查问卷评估了社区的态度和对植树的社会经济背景、效益和成本的保护参与。结果显示,绝大多数汪清区居民对植树造林持积极态度。从问卷中收集的数据显示,年龄、教育水平和收入等社会经济因素与受访者参与社区植树计划呈正相关。通过逐步二元物流,将六个变量列为影响家庭植树的主要因素。树木的重要性排在第1位(最具影响力的变量),奇数比为9.287,第6位是教育水平,奇数比为1.207。包含所有变量的完整模型有统计学意义(χ2 (10, N = 370) = 98.312, p < .001),清楚地表明该模型能够区分调查对象在最近6个月内种植了树木和没有种植树木。因此,建议通过提高对树木及其各种生态系统产品和服务的重要性的认识,使家庭可以廉价获得树苗,以及促进家庭在其农民中进行农林业,可以大大加强家庭植树
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引用次数: 0
Awareness and Perceptions of Climate Variability Adaptation among Forest-adjacent Communities in Mau Forest, Kenya 肯尼亚Mau森林邻近社区对气候变率适应的认识和感知
Pub Date : 2022-12-15 DOI: 10.37284/eajfa.5.1.1009
S. Mwangi, B. Kirui, G. Kibue
Adequate knowledge of climate variability is essential for the success of any adaptation or mitigation efforts. Thus, a study was conducted to investigate the levels of awareness and perceptions on the adaptation of climate variability among forest-adjacent communities (FACs) in Mau Forest, Kenya. Data for the investigation was generated through the administration of 313 questionnaires across randomly selected forest-adjacent households. Of the entire questionnaire, 311 were analysed, while two were returned uncompleted and therefore discarded. Descriptive and inferential statistical analyses were conducted. Descriptive analysis showed that 96% of the respondents had knowledge of climate variability, while 4% claimed no knowledge of it. Nearly two-thirds of respondents (65%) reported that they receive weather information, with media (electronic and print) cited as the most common (63%) source of this information. As regards frequency of information, those respondents who get information about climate variability occasionally constituted 60%, while 29% of respondents received information frequently. However, 14% of respondents rarely received any climate-related information. Respondents who received climate-related information occasionally (sometimes) constituted 56%. Alternatively, respondents reported that they obtained weather information from agricultural extension officers (17.6%) and Kenya Forestry Service (KFS) officials (15.3%). The perceptions of the farmers that they had observed erratic weather patterns with a general decline in rainfall and an increase in temperatures were corroborated by scientific data as a trend analysis on rainfall and temperature data over a 20-year period mirrored the farmer’s perceptions. A logistic regression model was fitted to determine the socioeconomic factors that influence farmers’ choice of adaptation to climate variability. The ANOVA test results (F-test) show that overall, the logistic regression model was significant (df = 310, p = 0.002). Results of the model revealed that household head age (df = 310, p = 0.015), household head years of residency (df = 310, p = 0.034), and farming experience (df = 310, p = 0.024) were all significant factors that influence FACs’ decision to adopt to climate variability either positively or negatively. This study therefore recommends for more awareness creation and training of FACs of East Mau on how to identify and deal with changing climatic conditions.  
充分了解气候变率对于任何适应或缓解努力的成功至关重要。因此,进行了一项研究,以调查肯尼亚茂森林森林邻近社区(FACs)对气候变率适应的认识和认知水平。调查数据是通过对随机选择的森林附近家庭的313份问卷管理产生的。在整个问卷中,有311份被分析,有两份未完成,因此被丢弃。进行描述性和推断性统计分析。描述性分析表明,96%的受访者了解气候变率,而4%的受访者声称不了解。近三分之二的受访者(65%)表示他们收到天气信息,媒体(电子和印刷)被认为是最常见的天气信息来源(63%)。就获取信息的频率而言,偶尔获得气候变率信息的受访者占60%,而经常获得信息的受访者占29%。然而,14%的受访者很少收到任何与气候有关的信息。偶尔(有时)收到气候相关信息的受访者占56%。另外,受访者报告说,他们从农业推广官员(17.6%)和肯尼亚林业局(KFS)官员(15.3%)那里获得天气信息。农民们的看法是,他们观察到降雨普遍减少、气温普遍升高的不稳定天气模式,这一看法得到了科学数据的证实,因为对20年期间降雨和温度数据的趋势分析反映了农民的看法。采用logistic回归模型确定影响农民适应气候变率选择的社会经济因素。方差分析结果(f检验)显示,总体而言,logistic回归模型显著(df = 310, p = 0.002)。模型结果显示,户主年龄(df = 310, p = 0.015)、户主居住年限(df = 310, p = 0.034)和务农经验(df = 310, p = 0.024)均是农户适应气候变率的正向或负向影响因素。因此,这项研究建议提高东茂地区农民的认识,并对他们进行培训,使他们了解如何确定和应对不断变化的气候条件。
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引用次数: 0
Farmer’s Local Knowledge towards Effects of Highland Bamboo (Oldeania alpina (K. Schum.) Stapleton) in Agroforestry 农民对高原竹(Oldeania alpina, K. Schum.)效应的地方认识斯台普顿)在农林业
Pub Date : 2022-12-09 DOI: 10.37284/eajfa.5.1.997
Chala Mamude, Elsabet Befikadu
Highland bamboo has been playing a great role in economic, ecological, and social aspects. However, its effects while planted in Agroforestry (AF) lands have not been documented. Therefore, the aim of this study was to assess the local farmer’s knowledge towards the effects of highland bamboo while planted in AF niches at Arbegona District, Sidama, Ethiopia. To this end, a reconnaissance survey was conducted to select two study kebeles from the district purposively based on the traditional bamboo-based AF potential in the area. The principal techniques such as semi-structured informant interviews, field observation, and focus group discussions were used to collect the data. A total of 50 informant farmers (25 from each kebele) were selected and interviewed through snowball method. The data were analysed using descriptive statistics by SPSS software. The findings showed that the majority of the respondents experienced positive socio-ecological effects (i.e., functioning as a windbreak (96%), fast-growing (92%), and livelihood supplement (88%) and adverse effects (i.e., high rhizome distribution (96%), shade effect and low decomposition rate of leaf litter (90%), and high competition for nutrients (86%)) of highland bamboo in AF. In addition, the major bamboo management practices by farmers were fencing (92%), thinning (88%), and terracing to rhizome control (84%). Therefore, the inclusion of local knowledge of farmers into science is vital while designing and developing agroforestry system particularly bamboo-based agroforestry. Finally, the study recommended further in-depth field experimental research should be investigated to identify the interaction effects of highland bamboo in AF practices
高原竹林在经济、生态、社会等方面发挥着重要作用。然而,在农林业(AF)土地上种植它的影响还没有记录。因此,本研究的目的是评估埃塞俄比亚锡达马Arbegona区旱地竹林生态位种植的当地农民对旱地竹林效应的了解程度。为此,根据该地区传统的竹基AF潜力,进行了一次调查,有目的地从该地区选择了两种研究树种。收集数据的主要方法包括半结构化的信息提供者访谈、实地观察和焦点小组讨论。采用滚雪球法对50名提供信息的农户进行访谈,每个农户各25人。采用SPSS软件进行描述性统计分析。结果表明:高原竹林具有良好的社会生态效应(如防风作用(96%)、快速生长作用(92%)和生计补充作用(88%),而竹林的不利效应(如根茎分布高(96%)、遮荫作用和凋落叶分解率低(90%)、养分竞争激烈(86%))。此外,农户的主要竹管理措施为围篱(92%)、间伐(88%)、间伐(88%)和间伐(96%)。梯田用于根茎控制(84%)。因此,在设计和发展农林业系统,特别是竹材农林业时,将农民的当地知识纳入科学是至关重要的。最后,建议进一步开展深入的田间试验研究,以确定高原竹在AF实践中的互作效应
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引用次数: 3
Spatio-temporal Analysis of Changes in Land Use-Land Cover for Conservation Efficacy of Urban Forest Reserve: The Case of Rau Forest Reserve, Tanzania 城市森林保护区保护效果的土地利用-土地覆被变化时空分析——以坦桑尼亚劳森林保护区为例
Pub Date : 2022-12-01 DOI: 10.37284/eajfa.5.1.985
G. Massawe, A. Abubakar, S. Sembosi̇, Priscilla Heita
Changes in land use and land cover in different places around the globe have a significant impact on ecological structure and functions as well. Analysis of the changes in land use and land cover is useful in management activities, especially forest reserves as it reflects the interaction between adjacent communities and natural resources. Due to the rapid sprawl in urbanisation, there has been a rapid change in the human-land relationship. Rau Forest is situated in Moshi Municipality of Kilimanjaro Region in Tanzania. There have been several claims of a decrease in vegetation cover in this important forest reserve, although there is no documentation on such claims. It is on the basis of this background this study was conducted to explore the changes in land use and land cover in the Rau Forest reserve to show the management status of this ecosystem which is also located in an urban area where management activities have been a challenge. The land use and cover (LULC) Spatio-temporal changes in the Rau Forest were classified as Densely Vegetation, Slightly Vegetation, Grassland, Bare land, Built-up, and Waterbodies to evaluate qualitative and quantitative changes in this reserve through the use of GIS techniques and tools over time (1990, 2000 and 2019). Forest encroachment has driven changes in land use and land cover and transformed parts of the Rau Forest reserve into the urban settlement, and grazing lands which has ultimately led to gradual forest degradation. Landsat imageries for the year were used to identify the Spatio-temporal changes in vegetation in the area. This study shows the downward trend for the densely vegetated part of the reserve at the expense of expansion in the built-up area. The results demonstrate the urgent need for strong and more severe regulations concerning the protection of Rau Forest and other urban situated forest reserves against land use and land cover changes for the benefit of the present and future generations.
全球各地土地利用和土地覆盖的变化对生态结构和功能也产生了重大影响。分析土地利用和土地覆盖的变化对管理活动很有用,特别是森林储备,因为它反映了邻近社区和自然资源之间的相互作用。由于城市化的快速扩张,人地关系发生了迅速的变化。劳森林位于坦桑尼亚乞力马扎罗州的莫希市。有些人声称这个重要的森林保护区的植被覆盖减少了,尽管没有关于这种说法的文件。正是基于这一背景,本研究进行了探索土地利用和土地覆盖的变化在劳森林保护区,以显示这个生态系统的管理状况,也位于一个城市地区,管理活动一直是一个挑战。利用GIS技术和工具(1990年、2000年和2019年),将劳森林的土地利用和覆被(LULC)时空变化分为植被密集、轻度植被、草地、裸地、建成区和水体,以评价该保护区的定性和定量变化。森林的入侵导致了土地利用和土地覆盖的变化,并将Rau森林保护区的部分地区转变为城市定居点和牧场,最终导致森林逐渐退化。利用该年的陆地卫星图像来确定该地区植被的时空变化。研究表明,保护区植被密集区呈下降趋势,而建成区的扩张则是代价。结果表明,为了今世后代的利益,迫切需要制定强有力和更严格的条例,保护劳森林和其他城市森林保护区,使其不受土地利用和土地覆盖变化的影响。
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引用次数: 0
Survival and Growth of Olive Tree (Olea africana) Seedlings Under Open Field Conditions is Enhanced in Hydrogel Amended Soils Media, Teso Subcounty, Kenya 肯尼亚特索县,水凝胶改良土壤介质提高了开放条件下橄榄树(Olea africana)幼苗的存活和生长
Pub Date : 2022-10-24 DOI: 10.37284/eajfa.5.1.899
Roselyne Awino Orure, P. Sirmah, T. Matonyei
The rapid decline of timber from natural forests against increasing domestic demand for wood products has caused a steady increase in timber prices in Kenya. Recently, research and development institutions have recognized the ecological and economic value of indigenous tree species and therefore have emphasized the importance of their future production on private smallholder farms rather than in large plantations. This situation has been worsened by climate changes such as the frequent high intensity of prolonged droughts and the nature of soils with poor water retention capacity. As a result, unplanted forest regeneration sites have increased hence a need for re-afforestation of these sites to meet the target for the plantation industry. Therefore, there is a need for mass production of Olea africana seedlings for reforestation programs. One such approach is the application of hydrogels or synthetic polymer organic combinations capable of improving the water and nutrient retention of the soil that can support seedling growth. This study sought to investigate the effects of hydrogel application on selected growth characteristics of O. africana. Seeds were germinated and transferred into two sets of tubes of the same size arranged in a complete randomized block design (CRBD) experiment. The sets were subjected to different levels of hydrogel concentration. Under (0gm as control) and 7gm, 14gm, and 21gm) concentration levels of hydrogel mixed with soil in open field conditions. The height and shoot collar diameter of germinated seedlings were measured every two weeks for two months. The survival of O. africana seedlings decreased with time for all treatments irrespective of the addition of hydrogels with the highest (85%) survival of seedlings on soils mixed with 21gm of hydrogel compared to 0gm hydrogel that recorded (15% survival) eight weeks after transplanting. Application of different levels of hydrogel on soils had a significant influence on the survival of transplanted O. africana seedlings (p˂0.05). Generally, the height of O. africana seedlings increased with time for all types of treatments (0, 7, 14 and 21gm of hydrogel); however, the rate of growth of seedlings was highest (0.667cm /week) on soils treated with 21gm of hydrogel and least (0.33cm/week) on 0gm hydrogel. The shoot collar diameter of O. africana seedlings increased with time for all types of treatments (0, 7, 14 and 21gm of hydrogel); however, the average shoot collar diameter of O. africana seedlings was highest (0.088mm/week) on soils inoculated with 21gm hydrogel and least (0.066mm/week) on soils not inoculated with hydrogel. These results imply that a higher dose of hydrogel significantly enhances the survival and growth characteristics (height and shoot collar diameter) of transplanted seedlings by improving the water-holding capacity of soil and making it available for plant uptake during dry conditions. Hydrogels can therefore be used to amend soils for a sustainable
天然林的木材迅速减少,而国内对木材产品的需求却不断增加,这导致肯尼亚木材价格稳步上涨。最近,研究和发展机构已经认识到本地树种的生态和经济价值,因此强调今后在私人小农农场而不是在大型种植园生产这些树种的重要性。这种情况因气候变化而恶化,例如频繁的高强度长期干旱和土壤保水能力差的性质。因此,未种植的森林再生地点增加了,因此需要对这些地点重新造林,以满足种植业的目标。因此,有必要大规模生产非洲油橄榄幼苗,用于重新造林计划。其中一种方法是应用水凝胶或合成聚合物有机组合物,能够改善土壤的水分和养分保留,从而支持幼苗生长。本研究旨在探讨水凝胶应用对非洲稻生长特性的影响。采用完全随机区组设计(CRBD),将种子萌发后移栽到两组大小相同的试管中。各组受到不同水平的水凝胶浓度。在(0gm为对照)和7gm、14gm、21gm)浓度条件下,水凝胶与土壤混合。每两周测量一次发芽苗的苗高和茎颈直径,连续两个月。无论是否添加水凝胶,所有处理下非洲稻幼苗的存活率都随着时间的推移而下降,在移栽8周后,在混合了21gm水凝胶的土壤上,幼苗存活率最高(85%),而在混合了0gm水凝胶的土壤上,幼苗存活率最高(15%)。在土壤上施用不同水平的水凝胶对移栽非洲稻幼苗的成活率有显著影响(p小于0.05)。在0、7、14和21gm水凝胶处理下,非洲云杉幼苗高度均随时间增加而增加;水凝胶用量为21gm时,幼苗生长速率最高(0.667cm /周),用量为0gm时,幼苗生长速率最低(0.33cm/周)。在0、7、14和21gm水凝胶处理下,非洲花幼苗的茎领直径随时间的增加而增大;而接种21gm水凝胶的土壤,非洲栎幼苗的平均茎领直径最大(0.088mm/周),未接种水凝胶的土壤最小(0.066mm/周)。这些结果表明,高剂量的水凝胶通过提高土壤的持水能力,使其在干旱条件下可供植物吸收,显著提高了移栽苗的存活和生长特性(高度和茎颈直径)。因此,水凝胶可以用于修复土壤,促进热带木材物种的可持续大规模再生,从而实现肯尼亚的再造林计划、增加森林覆盖和恢复生物多样性
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引用次数: 0
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East African Journal of Forestry and Agroforestry
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