柴达木盆地不同退化程度的天然草地生态位研究

Study on the Ecological Niche of Natural Grassland with Different Degraded Degree in Qaidam Basin

[目的]探讨草地退化过程中群落主要植物生态功能的变化规律。[方法]以青海省乌兰县不同退化程度的紫花针茅型天然草地为研究对象,利用生态位理论研究不同退化程度对天然草地的生态位宽度和生态位重叠的影响。[结果]随着天然草地退化程度的加剧,柴达木盆地天然草地优势种植物的生态位宽度和总生态位宽度呈下降趋势,而生态位重叠值略有减少。[结论]生态建设项目对改善退化天然草地生态系统生态状况具有重大意义。

[Objective]The research aimed to discuss the change laws of the ecological functions of main community plant species in the degraded process of grassland.[Method] Taking Stipa purpurea Griseb.natural grassland with different degraded degree in Dulan County of Qinghai Province as the research objects,the effects of different degraded degree on the ecological niche breadth and ecological niche overlap of the natural grassland were studied by using the niche theory.[Result]With the aggravation of the degraded degree of natural grassland,the ecological niche breadth of the dominant plant species and total ecological niche breadth of the natural grassland in Qaidam Basin showed the decreased trend and the ecological niche overlap decreased slightly.[Conclusion]The ecological construction project was of great significance for improving the ecological status of the ecosystem of the degraded natural grassland.