Biomass-dependent susceptibility to drought in experimental grassland communities.
Biomass-dependent susceptibility to drought in experimental grassland communities.
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DOI：
10.1111/j.1461-0248.2007.01031.x
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发表时间：
2007-05
期刊：
影响因子：
8.8
通讯作者：
Yongfan Wang;Shixiao Yu;Jiang-Hai Wang
中科院分区：
文献类型：
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作者：
Yongfan Wang;Shixiao Yu;Jiang-Hai Wang
早期的研究表明，当生态系统受到扰动时，植物多样性会影响生物量的群落抵抗力。然而，这种关系仍然存在争议。在这里，我们构建了草地群落，以测试在控制和实验干旱条件下物种多样性和生产力之间的关系。无论是在恒定条件下还是在干旱条件下，物种丰富度与生物量均不相关。然而，生物量生产较低的群落比生产力较高的群落更能抵御干旱胁迫。我们的研究结果还表明，生态系统对干旱的抵抗力是生物量的递减但非线性的函数。与此相反，物种多样性对生态系统阻力的影响很小，而且是模棱两可的。从这里报道的结果，和以前的几项研究的结果，我们认为，高生物量的系统表现出更大的生物量减少响应干旱比低生物量的系统没有，无论植物多样性和社区生物量生产之间的关系。
Earlier studies indicated that plant diversity influences community resistance in biomass when ecosystems are exposed to perturbations. This relationship remains controversial, however. Here we constructed grassland communities to test the relationships between species diversity and productivity under control and experimental drought conditions. Species richness was not correlated with biomass either under constant conditions or under drought conditions. However, communities with lower biomass production were more resistant to drought stress than those that were more productive. Our results also showed that ecosystem resistance to drought is a decreasing but nonlinear function of biomass. In contrast, species diversity had little and an equivocal effect on ecosystem resistance. From the results reported here, and the results of several previous studies, we suggest that high biomass systems exhibited a greater biomass reduction in response to drought than low biomass systems did, regardless of the relationship between plant diversity and community biomass production.