内蒙古温带草地植物群落及集合群落生产力稳定性研究

研究内蒙古温带草地的生产力稳定性及其维持机制和影响因素，有助于准确评估其可持续性并预测全球变化的响应。然而，基于具均匀性的理论假设和人工群落所预期的稳定性维持机制是否适用于具有不均匀性特点的自然生态系统尚存争议。此外，以往单一样地和群落水平的研究忽略了气候因子对稳定性及其维持机制的修饰作用，也忽略了群落间过程和动态对稳定性的影响。再者，我们不清楚自然生态系统的稳定性是依赖于物种丰富度还是优势种。本项目拟在具有不均匀性特点的内蒙古温带草地选择38个研究样地，基于集合群落理论框架研究生态系统稳定性及其生物和非生物调控机制。本项目致力于检验稳定性维持机制是否适用于具有不均匀性特点的自然生态系统；研究气候因子和群落间动态对稳定性的影响；分析内蒙古温带草地的稳定性是依赖于物种多样性还是优势种。实施本项目有助于我们准确评估和预测全球变化对内蒙古温带草地生产力稳定性的影响，并开展区域尺度的生态系统保护。

Researches of biotic stability mechanisms and their regulating factors in the Inner Mongolian temperate grassland are helpful for us to precisely evaluate the sustainability of this region and predict the effects of global changes. However, biotic stability mechanisms proposed by theoretical and biodiversity experimental studies basing on evenly distributed species abundances are argued to be irrelevant to natural ecosystems characterized with high-unevenness pattern. In addition, traditional single-site and community-level studies potentially neglected modifying effects of climatic factors on community stability and its maintaining biotic mechanisms, but also neglected the effects of inter-community dynamics on stabilities of natural ecosystems. Furthermore, we are still unclear about whether stabilities of natural ecosystems are driven by species richness or dominant species. Here, we will conduct a 38-sites study in Inner Mongolian temperate grassland characterized with unevenness, and investigate the stability and its biotic and abiotic regulating factors using a metacommunity-level method. This project aimed to examine the proposed stability mechanisms and analyze effects of climatic factors and inter-community dynamics on stabilities of natural ecosystems characterized with unevenness. In addition, this project will also analyze whether stabilities of natural communities and metacommunities are regulated by species richness or dominant species. This project will be helpful to precisely predict effects of global changes on the productivity stability of Inner Mongolian temperate grassland and has practical implications for region-scale ecosystem conservation.