黄土高原草地植物多样性与群落稳定性的关系及其驱动因素

植物多样性对维持生态功能的稳定发挥具有重要作用。以黄土高原不同植被带草地为研究对象，基于野外调查和实验分析，探究黄土高原不同植被带草地植物多样性与群落稳定性特征和二者之间的关系以及影响因素。结果表明：黄土高原草地群落结构特征(地上生物量、地下生物量)与植物多样性具有明显的纬度分布格局，草地植物多样性和生物量均表现出自东南向西北沿森林草原带—森林带—草原带—草原荒漠带逐渐递减趋势。森林草原带草地植物多样性和群落稳定性显著高于森林带、草原带和草原荒漠带；植物多样性与群落稳定性之间存在显著正相关关系，可以作为衡量群落稳定性的指标，其稳定性大小表现为森林草原带>森林带>草原带>草原荒漠带。降雨量是影响植物多样性和群落稳定性的主要因素，并通过改变土壤含水量影响群落稳定性。研究结果揭示了草地植物多样性与群落稳定性之间的关系及驱动机制，为维持黄土高原草地生态系统的群落稳定性提供了科学依据。

Relationship between grassland plant diversity and community stability and its driving factors on the Loess Plateau

Plant diversity plays an important role in maintaining the stability of ecological functions. Based on field investigation and empirical analysis, this study took the grassland in different vegetation zones of the Loess Plateau as the research object, explored the characteristics of plant diversity and community stability, assessed the relationship between the two indicators, and further revealed the essential drivers that affected the relationships. The results showed that the characteristics of community structure (aboveground biomass, underground biomass) and plant diversity (richness, diversity and evenness) in grassland on the Loess Plateau had an obvious latitudinal distribution pattern, and the diversity and biomass of grassland plant showed the following trend from southeast to northwest:forest steppe belt > forest belt > grassland belt > desert grassland belt. The plant diversity and community stability of grassland in forest steppe belt were significantly higher than those in the other belts; There was a significantly positive correlation between plant diversity and community stability, suggesting that the plant diversity could be used as an index to estimate the stability.The order of stability was forest-steppe belt>forest belt>steppe belt>steppe desert belt. Rainfall was the main factor that influenced plant diversity and community stability, further affecting community stability by changing soil moisture content. The results of this study revealed the relationship between grassland plant diversity and community stability and the underlying driving mechanism, which provided a scientific basis for maintaining the community stability of grassland ecosystem on the Loess Plateau.