Climate mediates the biodiversity-ecosystem stability relationship globally
Climate mediates the biodiversity-ecosystem stability relationship globally
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DOI：
10.1073/pnas.1800425115
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发表时间：
2018-08-14
影响因子：
11.1
通讯作者：
Maestre, Fernando T.
中科院分区：
文献类型：
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作者：
Garcia-Palacios, Pablo;Gross, Nicolas;Maestre, Fernando T.
保险假说认为生物多样性可以增加生态系统的稳定性，受到广泛的研究和政治关注。最近的实验表明，气候变化可以影响植物多样性如何影响生态系统的稳定性，但迄今为止获得的生物多样性-稳定性关系的大多数证据来自在有限的气候条件下进行的当地研究。在这里，我们调查气候如何介导植物（分类和功能）多样性和生态系统稳定性之间的关系在整个地球仪。为此，我们结合了14年的时间遥感测量植物生物量的多样性实地调查，在123个旱地生态系统，除南极洲。在广泛的气候和土壤条件下，植物物种池，和位置，我们能够解释73%的生态系统稳定性的变化，测量的时间平均生物量的SD的比率。植物多样性对生态系统稳定性的积极作用与气候和土壤因子同样重要。然而，我们也发现了一个强大的气候依赖性的生物多样性生态系统稳定性的关系，在我们的全球干旱梯度。我们的研究结果表明，叶性状的多样性可能会驱动生态系统的稳定性在低干旱水平，而物种丰富度可能有更大的稳定作用下，最干旱的条件下评估。我们的研究强调，以尽量减少与植物生物量，功能和分类植物多样性的生态系统服务的时间交付的变化，应特别促进低和高干旱条件下，分别。
The insurance hypothesis, stating that biodiversity can increase ecosystem stability, has received wide research and political attention. Recent experiments suggest that climate change can impact how plant diversity influences ecosystem stability, but most evidence of the biodiversity-stability relationship obtained to date comes from local studies performed under a limited set of climatic conditions. Here, we investigate how climate mediates the relationships between plant (taxonomical and functional) diversity and ecosystem stability across the globe. To do so, we coupled 14 years of temporal remote sensing measurements of plant biomass with field surveys of diversity in 123 dryland ecosystems from all continents except Antarctica. Across a wide range of climatic and soil conditions, plant species pools, and locations, we were able to explain 73% of variation in ecosystem stability, measured as the ratio of the temporal mean biomass to the SD. The positive role of plant diversity on ecosystem stability was as important as that of climatic and soil factors. However, we also found a strong climate dependency of the biodiversity-ecosystem stability relationship across our global aridity gradient. Our findings suggest that the diversity of leaf traits may drive ecosystem stability at low aridity levels, whereas species richness may have a greater stabilizing role under the most arid conditions evaluated. Our study highlights that to minimize variations in the temporal delivery of ecosystem services related to plant biomass, functional and taxonomic plant diversity should be particularly promoted under low and high aridity conditions, respectively.