Pub Date : 2020-08-27DOI: 10.4336/2020.pfb.40e201901942
B. White, Maria Fernanda Almeida Silva
Equipments used to register weather conditions became more accessible. However, studies that accurately quantify microclimatic conditions in forest ecosystems are still rare. This study aimed to describe and analyze the variations in the air temperature, air relative humidity and soil temperature in an Atlantic Forest fragment located in Mata do Junco Wildlife Refuge, Capela, Sergipe, Brazil. Weather stations programmed to record every 30 min over a period of one year were installed inside a forest area, composed by late successional species forming dense canopy, and in a 0.1 ha forest gap. Results showed that the microclimate in the dense canopy forest was less variable than in the forest gap, where daily and seasonal variations were more intense. The average air and soil temperatures were 0.6 oC and 2.5 oC higher in the forest gap, while the average air humidity was 6.9% higher in the dense forest. The Angstron index indicated a higher risk of wildfire occurrence in the gap.
用于记录天气状况的设备变得更容易获得。然而，准确量化森林生态系统小气候条件的研究仍然很少。本研究旨在描述和分析位于巴西卡佩拉Mata do Junco野生动物保护区的大西洋森林片段的气温、空气相对湿度和土壤温度的变化。在一个由晚演替物种组成的茂密林冠区和0.1公顷的林隙内，安装了一个气象站，每30分钟记录一次，为期一年。结果表明:密林林内小气候的变化幅度小于林窗，林窗的日变化和季节变化更大;林隙区平均气温和土壤温度分别高出0.6 oC和2.5 oC，而密林区平均空气湿度高出6.9%。Angstron指数表明，林隙中发生野火的风险较高。
{"title":"Microclima em fragmento de Mata Atlântica no Refúgio da Vida Silvestre Mata do Junco, Capela, Sergipe","authors":"B. White, Maria Fernanda Almeida Silva","doi":"10.4336/2020.pfb.40e201901942","DOIUrl":"https://doi.org/10.4336/2020.pfb.40e201901942","url":null,"abstract":"Equipments used to register weather conditions became more accessible. However, studies that accurately quantify microclimatic conditions in forest ecosystems are still rare. This study aimed to describe and analyze the variations in the air temperature, air relative humidity and soil temperature in an Atlantic Forest fragment located in Mata do Junco Wildlife Refuge, Capela, Sergipe, Brazil. Weather stations programmed to record every 30 min over a period of one year were installed inside a forest area, composed by late successional species forming dense canopy, and in a 0.1 ha forest gap. Results showed that the microclimate in the dense canopy forest was less variable than in the forest gap, where daily and seasonal variations were more intense. The average air and soil temperatures were 0.6 oC and 2.5 oC higher in the forest gap, while the average air humidity was 6.9% higher in the dense forest. The Angstron index indicated a higher risk of wildfire occurrence in the gap.","PeriodicalId":19940,"journal":{"name":"Pesquisa Florestal Brasileira","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41334867","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}
Pub Date : 2020-07-27DOI: 10.4336/2020.pfb.40e201801644
D. Duarte, G. Rocha, C. L. P. Resende, B. M. Silva, F. Rodrigues
The objective of this study was to identify the response mechanisms to water stress Schizolobium parahyba Vell. Blake seedlings. At 90 days after emergency the plants were subjected to 10 days of water deficit, then they were irrigated with different percentages of evapotranspiration (20, 40, 60, 80 and 100%) for ten more days. In the initial stage of development, seedlings of Schizolobium parahyba were partially tolerant to the caused water deficit. They presented dehydration delay as a strategy, reducing growth in height, diameter and number of leaves and directing the production of photoassimilates for maintenance, with low transpiration rate.
{"title":"Response of Schizolobium parahyba seedlings to water stress","authors":"D. Duarte, G. Rocha, C. L. P. Resende, B. M. Silva, F. Rodrigues","doi":"10.4336/2020.pfb.40e201801644","DOIUrl":"https://doi.org/10.4336/2020.pfb.40e201801644","url":null,"abstract":"The objective of this study was to identify the response mechanisms to water stress Schizolobium parahyba Vell. Blake seedlings. At 90 days after emergency the plants were subjected to 10 days of water deficit, then they were irrigated with different percentages of evapotranspiration (20, 40, 60, 80 and 100%) for ten more days. In the initial stage of development, seedlings of Schizolobium parahyba were partially tolerant to the caused water deficit. They presented dehydration delay as a strategy, reducing growth in height, diameter and number of leaves and directing the production of photoassimilates for maintenance, with low transpiration rate.","PeriodicalId":19940,"journal":{"name":"Pesquisa Florestal Brasileira","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48378353","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}
Pub Date : 2020-06-30DOI: 10.4336/2020.pfb.40e201801737
Luan F. F. Silva, Antonio Renan Sales de Castro, Rudson Silva Oliveira, Simonne Sampaio da Silva, Vanessa Mayara Souza Pamplona, D. D. S. Barros, J. Nobre, S. Numazawa
Forestry activities in the Amazon generate large amounts of waste, from logging process, with carbonization being a potential alternative to mitigate this liability. However, the diversity of species and the lack of information on ideal carbonization parameters make the operation of the ovens difficult. In this research, the effects of the species and carbonization parameters on energy quality in the conversion of wood industry residues into charcoal are evaluated. The study material came from the municipality of Paragominas, Para, collecting samples of the three most commercialized species, Handroanthus serratifolius (Vahl) S.O., Hymenolobium petraeum Ducke and Enterolobium schomburgkii (Benth.) Benth. The carbonizations were carried out in a muffle furnace, with temperatures of 500 °C and 600 °C and a final level of 30 min and 60 min. The species and temperature parameters were those that had a significant effect, exerting the greatest influence on the production and quality of charcoal. The time at the final level of carbonization did not show any influence on the variables. The increase in temperature caused a reduction in gravimetric yield. The wood residues of the three species showed high quality characteristics for the production of charcoal.
{"title":"Seleção de espécie, temperatura e tempo de carbonização na produção de carvão vegetal com resíduos madeireiros da Amazônia","authors":"Luan F. F. Silva, Antonio Renan Sales de Castro, Rudson Silva Oliveira, Simonne Sampaio da Silva, Vanessa Mayara Souza Pamplona, D. D. S. Barros, J. Nobre, S. Numazawa","doi":"10.4336/2020.pfb.40e201801737","DOIUrl":"https://doi.org/10.4336/2020.pfb.40e201801737","url":null,"abstract":"Forestry activities in the Amazon generate large amounts of waste, from logging process, with carbonization being a potential alternative to mitigate this liability. However, the diversity of species and the lack of information on ideal carbonization parameters make the operation of the ovens difficult. In this research, the effects of the species and carbonization parameters on energy quality in the conversion of wood industry residues into charcoal are evaluated. The study material came from the municipality of Paragominas, Para, collecting samples of the three most commercialized species, Handroanthus serratifolius (Vahl) S.O., Hymenolobium petraeum Ducke and Enterolobium schomburgkii (Benth.) Benth. The carbonizations were carried out in a muffle furnace, with temperatures of 500 °C and 600 °C and a final level of 30 min and 60 min. The species and temperature parameters were those that had a significant effect, exerting the greatest influence on the production and quality of charcoal. The time at the final level of carbonization did not show any influence on the variables. The increase in temperature caused a reduction in gravimetric yield. The wood residues of the three species showed high quality characteristics for the production of charcoal.","PeriodicalId":19940,"journal":{"name":"Pesquisa Florestal Brasileira","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44739936","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}
Pub Date : 2020-05-25DOI: 10.4336/2020.pfb.40e201801645
David Marlon Dalposso, Eleandro José Brun, F. Schroeder, Cristian Medrado Canonico, V. Macedo
With the increasing demand for agricultural, livestock and forestry production in Brazil and in the World, it has become necessary to maximize production in the same area, in a sustainable way, where the silvopastoral system becomes a form of integration of increasing performance. The objective of this work was to evaluate the physical attributes of two land use systems: pure pasture with Panicum maximum cv. Aruana and a silvipastoril system with Peltophorum dubium in the lines and Aruana grass between the lines. Four mini trenches (repetitions) were opened in each area (line, between lines and pure pasture of Aruana grass), subdivided into 4 depths (00-10, 10-20, 20-40 and 40-60 cm), composing 48 soil samples, collected with volumetric ring. The samples were analyzed for density, macroporosity, microporosity and total porosity. Macroporosity and microporosity varied with depth, inversely and directly, respectively. The highest soil density occurred in pure pasture, however, without reaching values that limit root growth. Although the total porosity of the soil did not present statistically significant differences, this one undergoes interference of the applied management over the area. The effect of the use of leguminous wood species in silvopastoral system may already be noticed, although still incipient.
{"title":"Qualidade física do solo sob sistema silvipastoril com Peltophorum dubium e Panicum maximum cv. Aruana","authors":"David Marlon Dalposso, Eleandro José Brun, F. Schroeder, Cristian Medrado Canonico, V. Macedo","doi":"10.4336/2020.pfb.40e201801645","DOIUrl":"https://doi.org/10.4336/2020.pfb.40e201801645","url":null,"abstract":"With the increasing demand for agricultural, livestock and forestry production in Brazil and in the World, it has become necessary to maximize production in the same area, in a sustainable way, where the silvopastoral system becomes a form of integration of increasing performance. The objective of this work was to evaluate the physical attributes of two land use systems: pure pasture with Panicum maximum cv. Aruana and a silvipastoril system with Peltophorum dubium in the lines and Aruana grass between the lines. Four mini trenches (repetitions) were opened in each area (line, between lines and pure pasture of Aruana grass), subdivided into 4 depths (00-10, 10-20, 20-40 and 40-60 cm), composing 48 soil samples, collected with volumetric ring. The samples were analyzed for density, macroporosity, microporosity and total porosity. Macroporosity and microporosity varied with depth, inversely and directly, respectively. The highest soil density occurred in pure pasture, however, without reaching values that limit root growth. Although the total porosity of the soil did not present statistically significant differences, this one undergoes interference of the applied management over the area. The effect of the use of leguminous wood species in silvopastoral system may already be noticed, although still incipient.","PeriodicalId":19940,"journal":{"name":"Pesquisa Florestal Brasileira","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41971989","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}
Pub Date : 2020-05-21DOI: 10.4336/2021.pfb.41e201901953
Francisco Ivo dos Santos Aguiar, R. Silva, Romário Martins Costa, C. D. S. Reis, Maryzélia Furtado de Farias, Luisa Julieth Parra-Serrano
Este trabalho objetivou determinar métodos eficientes para superação de dormência em sementes de Dimorphandra mollis Benth. As sementes foram coletadas em árvores matrizes do município de Buriti, MA, Brasil e foram submetidas aos seguintes tratamentos: controle (T1); escarificação mecânica com lixa n° 60 (T2); escarificação química com soda cáustica a 98% por 15 min (T3); escarificação química com ácido sulfúrico 99,9% por 20 min (T4) e choque térmico com água (T5). Em casa de vegetação, foram dispostas 16 sementes por tratamento, divididas em quatro repetições, em delineamento inteiramente ao acaso. As avaliações foram iniciadas ao terceiro dia após o tratamento das sementes e estenderam-se por 17 dias após a semeadura. Avaliou-se o percentual de sementes emergidas e o índice de velocidade de emergência. Os tratamentos de escarificação mecânica com lixa (T2) e escarificação química com ácido sulfúrico (T4) foram eficientes para superar a impermeabilidade do tegumento nas sementes, sendo a escarificação mecânica o método mais seguro aos usuários para a superação da dormência das sementes.
{"title":"Eficiência de diferentes métodos para superação da dormência em sementes de Dimorphandra mollis","authors":"Francisco Ivo dos Santos Aguiar, R. Silva, Romário Martins Costa, C. D. S. Reis, Maryzélia Furtado de Farias, Luisa Julieth Parra-Serrano","doi":"10.4336/2021.pfb.41e201901953","DOIUrl":"https://doi.org/10.4336/2021.pfb.41e201901953","url":null,"abstract":"Este trabalho objetivou determinar métodos eficientes para superação de dormência em sementes de Dimorphandra mollis Benth. As sementes foram coletadas em árvores matrizes do município de Buriti, MA, Brasil e foram submetidas aos seguintes tratamentos: controle (T1); escarificação mecânica com lixa n° 60 (T2); escarificação química com soda cáustica a 98% por 15 min (T3); escarificação química com ácido sulfúrico 99,9% por 20 min (T4) e choque térmico com água (T5). Em casa de vegetação, foram dispostas 16 sementes por tratamento, divididas em quatro repetições, em delineamento inteiramente ao acaso. As avaliações foram iniciadas ao terceiro dia após o tratamento das sementes e estenderam-se por 17 dias após a semeadura. Avaliou-se o percentual de sementes emergidas e o índice de velocidade de emergência. Os tratamentos de escarificação mecânica com lixa (T2) e escarificação química com ácido sulfúrico (T4) foram eficientes para superar a impermeabilidade do tegumento nas sementes, sendo a escarificação mecânica o método mais seguro aos usuários para a superação da dormência das sementes.","PeriodicalId":19940,"journal":{"name":"Pesquisa Florestal Brasileira","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47796131","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}
Pub Date : 2020-05-12DOI: 10.4336/2020.pfb.40e201902066
Pollyni Ricken, A. Hess, P. Mattos, E. Braz, Nelson Yoshihiro Nakajima, R. T. Hosokawa
Os índices morfométricos podem ser usados para subsidiar o entendimento da dinâmica de florestas naturais. Diante disso, objetivou-se descrever e avaliar as características morfométricas e dendrométricas de Araucaria angustifolia, como subsídio para compreensão da estrutura da floresta natural de araucária. Os dados foram mensurados em três municípios de Santa Catarina, considerando diferentes altitudes de ocorrência da espécie, com amostragem de 247 árvores, utilizando o método de Bitterlich, sendo medida a circunferência a 1,30 m do solo, altura total e de inserção de copa e raios de copa. As relações interdimensionais das árvores foram descritas por meio de índices morfométricos. O sítio 2 apresentou árvores de maior porte em relação ao diâmetro e área de copa. O sítio 3 apresentou a maior densidade de árvores (403 árvores ha-1), enquanto nos sítios 1 e 2 foram observadas 362 e 232 árvores ha-1, respectivamente. No sítio 3, a maior parte das árvores apresentou proporção de copa superior a 50% e formal de copa menor que 1, indicando árvores de copas mais estreitas e largas. O diâmetro da árvore apresentou correlação negativa e superior a 70% com o grau de esbeltez. Nos três sítios, o diâmetro apresentou correlação positiva com o diâmetro de copa.
{"title":"Morfometria de Araucaria angustifolia em diferentes altitudes no Sul do Brasil","authors":"Pollyni Ricken, A. Hess, P. Mattos, E. Braz, Nelson Yoshihiro Nakajima, R. T. Hosokawa","doi":"10.4336/2020.pfb.40e201902066","DOIUrl":"https://doi.org/10.4336/2020.pfb.40e201902066","url":null,"abstract":"Os índices morfométricos podem ser usados para subsidiar o entendimento da dinâmica de florestas naturais. Diante disso, objetivou-se descrever e avaliar as características morfométricas e dendrométricas de Araucaria angustifolia, como subsídio para compreensão da estrutura da floresta natural de araucária. Os dados foram mensurados em três municípios de Santa Catarina, considerando diferentes altitudes de ocorrência da espécie, com amostragem de 247 árvores, utilizando o método de Bitterlich, sendo medida a circunferência a 1,30 m do solo, altura total e de inserção de copa e raios de copa. As relações interdimensionais das árvores foram descritas por meio de índices morfométricos. O sítio 2 apresentou árvores de maior porte em relação ao diâmetro e área de copa. O sítio 3 apresentou a maior densidade de árvores (403 árvores ha-1), enquanto nos sítios 1 e 2 foram observadas 362 e 232 árvores ha-1, respectivamente. No sítio 3, a maior parte das árvores apresentou proporção de copa superior a 50% e formal de copa menor que 1, indicando árvores de copas mais estreitas e largas. O diâmetro da árvore apresentou correlação negativa e superior a 70% com o grau de esbeltez. Nos três sítios, o diâmetro apresentou correlação positiva com o diâmetro de copa.","PeriodicalId":19940,"journal":{"name":"Pesquisa Florestal Brasileira","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44207550","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}
Pub Date : 2020-05-07DOI: 10.4336/2020.pfb.40e201901954
S. Penteado, E. T. Iede, G. S. E. Schuhli
Outros organismos podem ser empregados no controle da vespa de madeira, alem do nematoide Deladenus siricidicola . E o caso do parasitoide Megarhyssa nortoni . Sua introducao no Brasil ocorreu com um numero limitado de exemplos e, ate o momento, nao foi possivel determinar seu estabelecimento. Apos 20 anos da introducao, recebemos relatos de adultos de M. nortoni capturados em Santa Catarina. Identifica varias variedades de adultos parasitados ou determina o seu estabelecimento no territorio brasileiro.
{"title":"Capture suggests the successful introduction of Sirex parasitoid in Brazil","authors":"S. Penteado, E. T. Iede, G. S. E. Schuhli","doi":"10.4336/2020.pfb.40e201901954","DOIUrl":"https://doi.org/10.4336/2020.pfb.40e201901954","url":null,"abstract":"Outros organismos podem ser empregados no controle da vespa de madeira, alem do nematoide Deladenus siricidicola . E o caso do parasitoide Megarhyssa nortoni . Sua introducao no Brasil ocorreu com um numero limitado de exemplos e, ate o momento, nao foi possivel determinar seu estabelecimento. Apos 20 anos da introducao, recebemos relatos de adultos de M. nortoni capturados em Santa Catarina. Identifica varias variedades de adultos parasitados ou determina o seu estabelecimento no territorio brasileiro.","PeriodicalId":19940,"journal":{"name":"Pesquisa Florestal Brasileira","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44938300","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}
Pub Date : 2020-01-13DOI: 10.4336/2020.pfb.40e201901894
M. A. Vivian, R. Côrrea, K. Modes, A. Caetano, Cristiane Pedrazzi, Mário Dobner Júnior
The objective of this study was to determine the chemical composition, basic density and tracheids morphological parameters of the wood of Cupressus lusitanica aiming to verify its suitability for cellulosic pulp production. Discs were collected from three 16-year-old trees to determine chemical, physical and morphological characteristics. The morphology of the tracheids was evaluated in the annual rings corresponding to the ages of 4, 7, 10, 13 and 16 years. The pulp quality parameters were calculated from the tracheid parameters. The chemical composition indicated low ash and extractive contents (0.27 and 2.13%, respectively), but high lignin content (32.52%). The basic density (0.375 g cm -3 ) was smaller than other species of softwood used for pulp production. The mean values of tracheids dimensions observed were 2.41 mm of length, 31.40 μm of width; 25.15 μm of lumen diameter and 3.12 μm of wall thickness, which tended to increase in values with increasing age. In general, C. lusitanica wood presents good technological characteristics for pulp and paper production, especially for the observed quality morphological index.
{"title":"Caracterização tecnológica da madeira de Cupressus lusitânica visando à produção de polpa celulósica","authors":"M. A. Vivian, R. Côrrea, K. Modes, A. Caetano, Cristiane Pedrazzi, Mário Dobner Júnior","doi":"10.4336/2020.pfb.40e201901894","DOIUrl":"https://doi.org/10.4336/2020.pfb.40e201901894","url":null,"abstract":"The objective of this study was to determine the chemical composition, basic density and tracheids morphological parameters of the wood of Cupressus lusitanica aiming to verify its suitability for cellulosic pulp production. Discs were collected from three 16-year-old trees to determine chemical, physical and morphological characteristics. The morphology of the tracheids was evaluated in the annual rings corresponding to the ages of 4, 7, 10, 13 and 16 years. The pulp quality parameters were calculated from the tracheid parameters. The chemical composition indicated low ash and extractive contents (0.27 and 2.13%, respectively), but high lignin content (32.52%). The basic density (0.375 g cm -3 ) was smaller than other species of softwood used for pulp production. The mean values of tracheids dimensions observed were 2.41 mm of length, 31.40 μm of width; 25.15 μm of lumen diameter and 3.12 μm of wall thickness, which tended to increase in values with increasing age. In general, C. lusitanica wood presents good technological characteristics for pulp and paper production, especially for the observed quality morphological index.","PeriodicalId":19940,"journal":{"name":"Pesquisa Florestal Brasileira","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43644745","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}
Pub Date : 2020-01-09DOI: 10.4336/2020.pfb.40e201801734
Janisson Batista de Jesus, Robério Anastácio Ferreira, Dráuzio Correia Gama, Alisson Souza de Oliveira
The objective of this study was to analyze the temporal behavior of seedlings survival from seeds without and with the application of treatment to overcome dormancy. We used native forest species, in a riparian forest area of the Piauitinga River, at the municipality of Lagarto, Sergipe State, Brazil. In the field, the design of the direct sowing was in randomized blocks, testing 5 native species (2 pioneer: Guazuma ulmifolia Lam. e Cecropia pachystachya Trecul. and 3 climax species, that are demanding of light: Cassia grandis L.f., Enterolobium contortisiliquum (Vell.) and Libidibia ferrea var. leiostachya L. P. Queiroz). We used 2 treatments (without and with the application of treatment to overcome dormancy) in four replicate samples. Seedlings of Enterolobium contortisiliquum from seeds without treatment to overcome dormancy presented the highest survival among the species and treatments used. Libidibia ferrea var. leiostachya presented late emergence. The initial survival of the species seedlings used in the riparian forest sections of the Piauitinga River showed a decrease over time until stabilization was achieved after sowing, regardless treatment to overcome dormancy.
本研究的目的是分析种子在没有和应用处理克服休眠的情况下幼苗存活的时间行为。我们在巴西塞尔希佩州拉加托市的Piauitinga河沿岸森林地区使用了本地森林物种。在田间，直接播种的设计是随机分组的，试验了5种本地物种(2种先驱:瓜祖玛ulmifolia Lam)。e大眼盲症。3种需要光的顶极物种:决明子(Cassia grandis L.f.)、弯曲肠虫(Enterolobium contortisiliquum, Vell.)和Libidibia ferrea var. leiostachya l.p. Queiroz)。我们在4个重复样本中使用了2种处理(不使用和使用处理来克服休眠)。在不同的品种和处理中，未经休眠处理的弯曲肠虫幼苗成活率最高。leiostachya Libidibia ferrea var. leiostachya出现晚。在Piauitinga河河岸林段使用的物种幼苗的初始存活率随着时间的推移而下降，直到播种后达到稳定，无论采取何种措施来克服休眠。
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Pub Date : 2020-01-09DOI: 10.4336/2020.pfb.40e201801745
Adglecianne S. Melo, L. Benitez, V. S. Barbosa
Moringa oleifera Lam. e uma especie tolerante a ambientes aridos e semi-aridos, como o nordeste brasileiro. Nessa regiao as condicoes climaticas fazem da agua um recurso escasso. A limitacao hidrica afeta o crescimento e desenvolvimento vegetal e seu impacto dependera da sua duracao, intensidade e estadio de desenvolvimento da planta. Durante o periodo reprodutivo o deficit hidrico pode ser critico, pois nesta fase ha alta demanda hidrica. O presente trabalho teve o objetivo de verificar como os atributos reprodutivos de M. oleifera respondem a sazonalidade do semi-arido brasileiro. Partimos da hipotese que atributos como tamanho dos frutos, numero e qualidade fisiologica das sementes sao diferentes entre a estacao seca e chuvosa, apresentando valores inferiores para a estacao seca. Foram analisadas as caracteristicas biometricas dos frutos e a germinacao de sementes de M. oleifera produzidos nas duas estacoes. Observaram-se diferencas no peso, comprimento dos frutos e numero de sementes, assim como velocidade e porcentagem de germinacao entre as estacoes, sendo os valores superiores para a estacao chuvosa. A sazonalidade afetou aspectos reprodutivos importantes para o sucesso de recrutamento e estabelecimento dessa especie, evidenciando que, mesmo tolerando a seca, o deficit hidrico pode limitar o sucesso reprodutivo de M. oleifera.
{"title":"Environmental seasonality influences on reproductive attributes of Moringa oleifera","authors":"Adglecianne S. Melo, L. Benitez, V. S. Barbosa","doi":"10.4336/2020.pfb.40e201801745","DOIUrl":"https://doi.org/10.4336/2020.pfb.40e201801745","url":null,"abstract":"Moringa oleifera Lam. e uma especie tolerante a ambientes aridos e semi-aridos, como o nordeste brasileiro. Nessa regiao as condicoes climaticas fazem da agua um recurso escasso. A limitacao hidrica afeta o crescimento e desenvolvimento vegetal e seu impacto dependera da sua duracao, intensidade e estadio de desenvolvimento da planta. Durante o periodo reprodutivo o deficit hidrico pode ser critico, pois nesta fase ha alta demanda hidrica. O presente trabalho teve o objetivo de verificar como os atributos reprodutivos de M. oleifera respondem a sazonalidade do semi-arido brasileiro. Partimos da hipotese que atributos como tamanho dos frutos, numero e qualidade fisiologica das sementes sao diferentes entre a estacao seca e chuvosa, apresentando valores inferiores para a estacao seca. Foram analisadas as caracteristicas biometricas dos frutos e a germinacao de sementes de M. oleifera produzidos nas duas estacoes. Observaram-se diferencas no peso, comprimento dos frutos e numero de sementes, assim como velocidade e porcentagem de germinacao entre as estacoes, sendo os valores superiores para a estacao chuvosa. A sazonalidade afetou aspectos reprodutivos importantes para o sucesso de recrutamento e estabelecimento dessa especie, evidenciando que, mesmo tolerando a seca, o deficit hidrico pode limitar o sucesso reprodutivo de M. oleifera.","PeriodicalId":19940,"journal":{"name":"Pesquisa Florestal Brasileira","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44808306","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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