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Sci.Rep:中科院武汉植物园在亚热带山地森林群落β多样性研究中取得进展

摘要 : 近日,国际学术权威刊物自然出版集团旗下子刊《Scientific Reprots》杂志上在线发表中国科学院武汉植物园植被生态学学科组副研究员乔秀娟的一篇研究文章,文章揭示亚热带山地森林群落β多样性研究。

 近日,国际学术权威刊物自然出版集团旗下子刊《Scientific Reprots》杂志上在线发表中国科学院武汉植物园植被生态学学科组副研究员乔秀娟的一篇研究文章,文章揭示亚热带山地森林群落β多样性研究。

β多样性也被称为生境间的多样性,可以度量时空尺度上物种组成的变化,是生物多样性的重要组成部分,与许多生态学和进化生物学问题密切相关。扩散过程和生态位过程共同决定了β多样性,只是这两个过程的相对重要性依地理区域和物种类群的不同而有所差异。湖南八大公山25 ha样地代表了亚热带山地常绿落叶阔叶混交林类型,物种丰富,地形多变,研究该样地内不同生态学过程对β多样性的相对贡献,对补充和提高科学家对物种丰富群落构建机制的理解有重要意义。

植被生态学学科组副研究员乔秀娟等,利用八大公山25ha动态定位样地物种清查数据,使用distance-based Moran’s eigenvectors maps (dbMEM) 和 redundancy analysis (RDA)方法,分解了环境要素和空间距离对样地内物种周转的相对影响,并计算了每个样方内的局地β多样性。结果表明,环境和空间因子可以解释群落组成β多样性的60%的空间变异。土壤因子单独可以解释物种空间变异的21.6%,略高于地形因子的单独解释量(15.7%)。地形和土壤总共解释β多样性变异的27%,稍低于空间距离的解释量(34%)。基于现有的环境数据,八大公山群落结构受到中性过程和生态位过程的共同影响。

整个森林群落β多样性的方差分解图

不同生活型物种β多样性方差分解图

不同生活型物种局地β多样性(20*20 m2)与物种数目的关系

原文链接:

Beta diversity determinants in Badagongshan, a subtropical forest in central China

原文摘要:

Niche and neutral theories emphasize different processes contributing to the maintenance of species diversity. In this study, we calculated the local contribution to beta diversity (LCBD) of every cell, using variation partitioning in combination with spatial distance and environmental variables of the 25-ha Badagongshan plot (BDGS), to determine the contribution of environmentally-related variation versus pure spatial variation. We used topography and soil characteristics as environmental variables, distance-based Moran’s eigenvectors maps (dbMEM) to describe spatial relationships among cells and redundancy analysis (RDA) to apportion the variation in beta diversity into three components: pure environmental, spatially-structured environmental, and pure spatial. Results showed LCBD values were negatively related to number of common species and positively related to number of rare species. Environment and space jointly explained ~60% of the variation in species composition; soil variables alone explained 21.6%, slightly more than the topographic variables that explained 15.7%; topography and soil together explained 27%, slightly inferior to spatial variables that explained 34%. The BDGS forest was controlled both by the spatial and environmental variables, and the results were consistent across different life forms and life stages.

来源: Scientific Reports 浏览次数:0

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