Higher effect of plant species diversity on productivity in natural than artificial ecosystems
Higher effect of plant species diversity on productivity in natural than artificial ecosystems
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DOI：
10.1073/pnas.0704801105
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发表时间：
2008-04-22
影响因子：
11.1
通讯作者：
Sala, Osvaldo E.
中科院分区：
文献类型：
--
作者：
Flombaum, Pedro;Sala, Osvaldo E.
当前和预期的生物多样性变化激发了重大实验，这些实验报告了植物物种多样性与初级生产之间的正相关关系。作为解决这种关系的第一步，这些操纵性实验控制了尽可能多的潜在混杂协变量，并出于实验目的组装了人工生态系统。作为这一努力的新一步，我们询问植物物种丰富度与自然生态系统生产力的关系。在这里，我们报告了在巴塔哥尼亚草原自然生态系统中进行的一项实验，其中我们评估了生物多样性对初级生产的影响。利用通过去除物种同时保持恒定生物量而产生的植物物种多样性梯度，我们发现地上净初级生产力随着植物物种数量的增加而增加。我们还发现，自然生态系统的生物多样性效应比人工生态系统更大。这一结果支持了之前的发现，也表明生物多样性对自然生态系统的影响可能比目前想象的要大得多。
Current and expected changes in biodiversity have motivated major experiments, which reported a positive relationship between plant species diversity and primary production. As a first step in addressing this relationship, these manipulative experiments controlled as many potential confounding covariables as possible and assembled artificial ecosystems for the purpose of the experiments. As a new step in this endeavor, we asked how plant species richness relates to productivity in a natural ecosystem. Here, we report on an experiment conducted in a natural ecosystem in the Patagonian steppe, in which we assessed the biodiversity effect on primary production. Using a plant species diversity gradient generated by removing species while maintaining constant biomass, we found that aboveground net primary production increased with the number of plant species. We also found that the biodiversity effect was larger in natural than in artificial ecosystems. This result supports previous findings and also suggests that the effect of biodiversity in natural ecosystems may be much larger than currently thought.