围栏封育对草地生物多样性的影响

Effects of Enclosure on Grassland Plant Biodiversity

利用玛曲沙质次生裸地植物群落丰富度、多样性、均匀度及生产力的抽样调查资料,分析了不同放牧方式下植物群落生物多样性的变化情况,探讨围栏封育对草地生物多样性的影响。结果表明,对草地实行围栏封育,虽有利于群落优势度指数增大,但系统内群落的物种丰富度、均匀度和植物多样性均显著低于适度利用的草地,而适度放牧利用草地的群落物种多样性和丰富度以及植被均匀度均表现为最高。

A sample survey was conducted of species richness, species diversity, evenness and productivity of plant community in Maqu sandy grassland. At typical sample plots, the variation of plant community biodiversity wasanalyzed at different grazing systems, and the effect of enclosure on grassland plant biodiversity was discussed. The results indicate that the species richness, evenness and plant diversity were the highest in moderate utilizationgrasslands. Ahhough enclosure was benefit for community dominance increasing, species richness, evenness and species diversity significantly were lower than those in moderate utilization grasslands.