Plant-Soil Feedback / Microbial Ecology: disentangling negative and positive soil feedback effects

植物多样性可以促进几种生态系统功能，但植物-土壤生物相互作用在促进这些生态系统服务方面的潜在作用仍未得到充分研究。本提案的目的是调查土壤微生物在影响植物多样性梯度上的植物生长反应中的作用。首先，我们将通过对土壤细菌、真菌和线虫的分子、生化、形态和功能鉴定，研究特定的病原菌、共生互助者和分解者的土壤微生物群落是如何跨植物群落(由1-60种组成)构成的。其次，将研究植物群落特有的土壤群落对植物单一栽培和混合栽培的生产力、结构和动态的反馈效应。这些测量和实验将是对子项目2和4的补充，其结果将是对植物-植物相互作用研究的补充，所有这些都加强了我们对植物-土壤有机体相互作用在改变植物物种丰度分布和动态以及初级生产力随时间的稳定性方面的作用的理解。

Plant diversity can promote several ecosystem functions, but the underlying role of plant–soil organism interactions in the promotion of these ecosystem services remains poorly investigated. The aim of the present proposal is to investigate the role of soil microorganisms in affecting plant growth responses along a plant diversity gradient. Firstly, we will investigate how specific soil microbial communities of pathogens, symbiotic mutualists and decomposers are structured across plant communities (composed of 1 to 60 species) using molecular, biochemical, morphological and functional identification of soil bacteria, fungi and nematodes. Secondly, feedback effects of plant community-specific soil communities on the productivity, structure and dynamics of plant monocultures and mixtures will be studied. The measurements and experiments will complement those of subprojects 2 and 4, and the results will be complementary to studies of plant–plant interactions, all together enhancing our understanding on the role of plant–soil organism interactions in modifying plant species abundance distributions and dynamics, as well as the stability of primary productivity over time.