高寒草地植物多样性与Godron群落稳定性关系及其环境驱动因素

植物群落多样性及稳定性对草地生态系统功能的稳定发挥至关重要。本研究以青藏高原高寒湿地草甸、高寒草甸、高寒草原和高寒荒漠草原为研究对象，基于480个野外样方调查及实验分析，运用显著性分析、回归分析和结构方程模型等方法，探究不同草地类型植物多样性与稳定性之间关系及其影响因素。结果表明：高寒草原植物多样性显著高于其他3种草地类型；高寒草甸群落稳定性最高。高寒草地中，不同的物种多样性指标与群落稳定性的关系不同，4种草地类型均匀度与群落稳定性显著负相关；高寒草甸和高寒荒漠草原中Shannon-Wiener多样性与群落稳定性显著负相关，在高寒湿地草甸和高寒草原中丰富度与稳定性显著正相关。降水量是影响高寒草地植物多样性和群落稳定性的主要因素，土壤有机碳、pH以及铵态氮含量也能通过影响植物多样性进而影响群落稳定性。综上，在高寒草地生态系统的管理过程中，需充分考虑气候和土壤因子的变化，根据草地类型制定不同的管理措施。

The diversity-Godron stability relationship of alpine grassland and its environmental drivers

The diversity and stability of plant communities is of great significance to the function of ecosystems and their ability to provide services. Drawing on field investigation and analysis of data from 480 sample plots， the present study explored the relationship between plant diversity and stability of alpine wetland meadow， alpine meadow， alpine steppe and alpine desert steppe， and also elucidated their environmental drivers using significance analysis， regression analysis and structural equation modeling. It was found that the alpine steppe had higher plant diversity than the other three grassland types， and alpine meadow had the highest community stability. The relationship between species diversity and community stability was different in the four alpine grassland types. The community evenness was negatively correlated with community stability. Plant Shannon-Wiener diversity was negatively correlated with community stability in alpine meadow and alpine desert steppe， but in contrast plant richness was positively correlated with community stability in alpine wetland meadow and alpine steppe. Precipitation is the main factor affecting plant diversity and community stability in alpine grassland. Soil organic carbon， pH and ammonium nitrogen content also affected community stability through altering plant diversity. Taken together， climate and soil factors should be considered in the management of alpine grassland ecosystems， and different management measures should be formulated for different types of grassland.