【摘要】 基于样方调查统计了青藏高原多年冻土区高寒草地生态系统植物的科属组成,计算了多样性指数和均匀度指数,探讨了多年冻土退化对高寒草地物种多样性的影响。结果表明:多年冻土退化过程中物种组成在属和物种丰富度上呈现降低趋势,湿、中生植物逐渐被旱中生和旱生植物替代;青藏高原多年冻土退化会导致高寒草地生态系统的物种多样性和初级生产力的降低,影响高寒草地生态系统的稳定性;物种多样性与初级生产力具有密切的抛物线型关系。更多还原

【Abstract】 Based on quadrat investigation,this paper studied the species composition of alpine vegetation in permafrost region of Qinghai-Tibetan Plateau,calculated the diversity index and evenness index,and approached the effects of permafrost degradation on the species diversity.During the permafrost degradation,the family number and species richness decreased,and the hygrophytes and mesophytes were gradually replaced by meso-xerophytes and xerophytes.Permafrost degradation lowered the species diversity and primary productivity,giving negative effects on the stability of alpine grassland ecosystem.There was a close parabolic relationship between species diversity and primary productivity.更多还原