PDF(Pubmed)
Abstract：
A long-standing key issue for examining the relationships between biodiversity and ecosystem functioning (BEF), such as forest productivity, is whether ecosystem functions are influenced by the total number of species or the properties of a few key species. Compared with controlled ecosystem experiments, the BEF relationships in secondary forest remain unclear, as do the effects of common species richness and rare species richness on the variation in ecosystem functions. To address this issue, we conducted field surveys at five sampling sites (1 ha each) with subtropical secondary evergreen broad-leaved forest vegetation. We found (1) a positive correlation between species richness and standing aboveground biomass (AGB); (2) that common species were primarily responsible for the distribution patterns of species abundance and dominance; although they accounted for approximately 25% of the total species richness on average, they represented 86-91% of species abundance and 88-97% of species dominance; and (3) that common species richness could explain much more of the variation in AGB than total species richness (common species plus rare species) at both the site and plot scales. Because rare species and common species were not equivalent in their ability to predict productivity in the biodiversity-ecosystem productivity model, redundant information should be eliminated to obtain more accurate results. Our study suggested that woody plant species richness and productivity relationship in subtropical forest ecosystem can be explained and predicted by a few common species.
摘要：
研究生物多样性与生态系统功能（BEF）之间关系的长期关键问题，比如森林生产力，是生态系统功能是否受物种总数或少数关键物种特性的影响。与受控生态系统实验相比，次生林中的BEF关系仍不清楚，常见物种丰富度和稀有物种丰富度对生态系统功能变化的影响也是如此。为了解决这个问题，我们在五个采样点（每个1公顷）对亚热带次生常绿阔叶林植被进行了实地调查。我们发现（1）物种丰富度与地上生物量（AGB）之间存在正相关；（2）常见物种主要负责物种丰富度和优势度的分布模式；尽管它们平均占总物种丰富度的25％，它们代表了86-91％的物种丰度和88-97％的物种优势；（3）在站点和地块尺度上，与总物种丰富度（普通物种加稀有物种）相比，普通物种丰富度可以解释更多的AGB变异。因为稀有物种和常见物种在生物多样性-生态系统生产力模型中预测生产力的能力不相等，应消除冗余信息，以获得更准确的结果。我们的研究表明，亚热带森林生态系统中的木本植物物种丰富度和生产力关系可以用一些常见物种来解释和预测。
