Smithsonian Tropical Research Institute, Balboa Ancon, Republic of Panama.
Department of Ecology, Evolution, and Marine Biology, University of California, Santa Barbara, Santa Barbara, CA, USA.
Nat Commun. 2020 May 5;11(1):2204. doi: 10.1038/s41467-020-16047-5.
Empirical studies show that plant-soil feedbacks (PSF) can generate negative density dependent (NDD) recruitment capable of maintaining plant community diversity at landscape scales. However, the observation that common plants often exhibit relatively weaker NDD than rare plants at local scales is difficult to reconcile with the maintenance of overall plant diversity. We develop a spatially explicit simulation model that tracks the community dynamics of microbial mutualists, pathogens, and their plant hosts. We find that net PSF effects vary as a function of both host abundance and key microbial traits (e.g., host affinity) in ways that are compatible with both common plants exhibiting relatively weaker local NDD, while promoting overall species diversity. The model generates a series of testable predictions linking key microbial traits and the relative abundance of host species, to the strength and scale of PSF and overall plant community diversity.
实证研究表明，植物-土壤反馈（PSF）可以产生负密度依赖（NDD）的繁殖，从而能够在景观尺度上维持植物群落多样性。然而，在局部尺度上，常见植物通常表现出相对较弱的 NDD ，而稀有植物表现出相对较强的 NDD ，这一观察结果与整体植物多样性的维持很难协调一致。我们开发了一个空间显式模拟模型，该模型跟踪微生物共生体、病原体及其植物宿主的群落动态。我们发现，净 PSF 效应随宿主丰度和关键微生物特性（例如，宿主亲和性）的变化而变化，这与常见植物表现出相对较弱的局部 NDD 的方式一致，同时促进了整体物种多样性。该模型生成了一系列可测试的预测，将关键微生物特性和宿主物种的相对丰度与 PSF 的强度和范围以及整体植物群落多样性联系起来。
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