Currently there is an urgent and special attention in actions to restore tropical forests.In this study,we evaluated the effect of different restoration methods on aboveground biomass(AGB)stock,tree community diversit...Currently there is an urgent and special attention in actions to restore tropical forests.In this study,we evaluated the effect of different restoration methods on aboveground biomass(AGB)stock,tree community diversity and structure,in areas affected by the Fundão tailings dam collapse in Mariana,Minas Gerais state,Brazil.We measured and compiled data of the AGB,community diversity and structure attributes in 36 plots distributed in six restoration treatments and six replicas:planting of native tree seedlings with fertilization and pH correction(PSf)and without fertilization and pH correction(PS);seeding of native trees with fertilization and pH correction(SDf)and without fertilization and pH correction(SD);natural regeneration with fertilization and pH correction(NRf)and without fertilization and pH correction(NR).No significant differences in substrate properties and AGB between treatments.Although biomass storage between treatments was not statistically different,there is a clear pattern showing higher values active restoration method.The Pielou index ranged from 0.520(SDf)to 0.943(NR),except for SDf all the others treatments had values higher than 0.76.This result suggests floristic heterogeneity,without ecological dominance in the plant community.Overall,active restoration had important implications for the forest restoration where natural regeneration is limited.展开更多
科学基金在促进我国基础科学研究方面扮演着重要的角色,近十年来,我国在海洋领域科学的资助投入保持了较快的增长。本文对比研究了2007-2019年间中国国家自然科学基金委员会(National Natural Science Foundation of China,NSFC)和美国...科学基金在促进我国基础科学研究方面扮演着重要的角色,近十年来,我国在海洋领域科学的资助投入保持了较快的增长。本文对比研究了2007-2019年间中国国家自然科学基金委员会(National Natural Science Foundation of China,NSFC)和美国国家科学基金会(National Science Foundation,United States,NSF)对海洋科学领域的资助情况,包括资助项目数量及类型、资助金额等;以NSFC和NSF在该领域不同年代、类型的立项项目及项目产出的SCIE论文为研究对象,探究项目产出论文数量、质量以及研究主题等方面的差异性,分析NSFC和NSF在海洋科学领域的资助方向的差异性,进而揭示NSFC对我国海洋科学领域的资助效果。结果发现,NSFC在我国海洋领域的经费投入增加幅度较大,项目发表论文数量和论文平均影响力与资助金额呈正相关关系;NSFC海洋科学领域项目均论文产出数量高于NSF的相应项目产出,但论文影响力与其仍有差距;NSFC和NSF海洋领域资助方向与论文产出主题均较为一致,但资助重点差异明显,NSFC资助研究集中在南海、东海和黄海等近海海域,重点资助领域包括海洋天然产品、物种分类、遥感和生态灾害等;NSF资助研究集中在墨西哥湾、南大洋和大西洋,重点资助领域包括珊瑚礁生态系统、气候变化、深海热液喷口、海洋酸化和生物地球化学循环等;NSFC资助基本涵盖海洋领域热点研究问题,未来资助应强化国际科技合作,扩大研究海域,在海洋缺氧、生物地球化学循环以及深海等领域加大资助力度。展开更多
基金To the National Council of Scientific and Technological Development of Brazil(CNPq),provided for research fellowships for S.V.Martins and to the Fundação Renova for provided infrastructure and financial support for the project.
文摘Currently there is an urgent and special attention in actions to restore tropical forests.In this study,we evaluated the effect of different restoration methods on aboveground biomass(AGB)stock,tree community diversity and structure,in areas affected by the Fundão tailings dam collapse in Mariana,Minas Gerais state,Brazil.We measured and compiled data of the AGB,community diversity and structure attributes in 36 plots distributed in six restoration treatments and six replicas:planting of native tree seedlings with fertilization and pH correction(PSf)and without fertilization and pH correction(PS);seeding of native trees with fertilization and pH correction(SDf)and without fertilization and pH correction(SD);natural regeneration with fertilization and pH correction(NRf)and without fertilization and pH correction(NR).No significant differences in substrate properties and AGB between treatments.Although biomass storage between treatments was not statistically different,there is a clear pattern showing higher values active restoration method.The Pielou index ranged from 0.520(SDf)to 0.943(NR),except for SDf all the others treatments had values higher than 0.76.This result suggests floristic heterogeneity,without ecological dominance in the plant community.Overall,active restoration had important implications for the forest restoration where natural regeneration is limited.
文摘科学基金在促进我国基础科学研究方面扮演着重要的角色,近十年来,我国在海洋领域科学的资助投入保持了较快的增长。本文对比研究了2007-2019年间中国国家自然科学基金委员会(National Natural Science Foundation of China,NSFC)和美国国家科学基金会(National Science Foundation,United States,NSF)对海洋科学领域的资助情况,包括资助项目数量及类型、资助金额等;以NSFC和NSF在该领域不同年代、类型的立项项目及项目产出的SCIE论文为研究对象,探究项目产出论文数量、质量以及研究主题等方面的差异性,分析NSFC和NSF在海洋科学领域的资助方向的差异性,进而揭示NSFC对我国海洋科学领域的资助效果。结果发现,NSFC在我国海洋领域的经费投入增加幅度较大,项目发表论文数量和论文平均影响力与资助金额呈正相关关系;NSFC海洋科学领域项目均论文产出数量高于NSF的相应项目产出,但论文影响力与其仍有差距;NSFC和NSF海洋领域资助方向与论文产出主题均较为一致,但资助重点差异明显,NSFC资助研究集中在南海、东海和黄海等近海海域,重点资助领域包括海洋天然产品、物种分类、遥感和生态灾害等;NSF资助研究集中在墨西哥湾、南大洋和大西洋,重点资助领域包括珊瑚礁生态系统、气候变化、深海热液喷口、海洋酸化和生物地球化学循环等;NSFC资助基本涵盖海洋领域热点研究问题,未来资助应强化国际科技合作,扩大研究海域,在海洋缺氧、生物地球化学循环以及深海等领域加大资助力度。
