中文摘要：

高原鼠兔有效洞口数密度变化会引起高山嵩草草甸植物组分变化,而且引起种间关系的改变。研究了高原鼠兔有效洞口数密度对高山嵩草草甸植物种间联结性的影响。结果表明,随高原鼠兔有效洞口数密度增加,原优势种高山嵩草优势度降低,而原伴生种达乌里秦艽和小花草玉梅等植物的优势度却逐渐增加;植物群落内主要物种间的总体联结性从有效洞口数密度小于或等于224个/hm2时的正关联,转变为有效洞口数密度超过224个/hm2时的负关联;高山嵩草和青藏苔草的联结性从有效洞口数密度≤224个/hm2时的正关联,转变为有效洞口数密度超过224个/hm2时的负关联,而密花香薷和乳浆大戟、乳浆大戟和黄花棘豆的联结性则相反。这说明高原鼠兔有效洞口数密度变化改变了高山嵩草草甸植物种间的总体联结性,有效洞口数密度为224个/hm2时种间联结性最强,群落最稳定。

英文摘要：

Changes in the active burrow entrance densities of plateau pika （Ochotona curzoniae） can result in changes in the botanical composition in Kobresia pygmaea meadow which can influence interspecific relation- ships in the meadow. A field survey was carried out to determine the effect of active plateau pika active burrow entrance densities on the interspecific asseclation between the major plant species in K. pygmaea meadow. This study showed that the dominance index for K. pygmaea （dominant species）, decreased, while the domi- nance index of associated species including Gentiana dahurica and Anemone rivularis var. flore-minors in- creased as burrow density increased. The overall interspecific association among the main plant species of the K. pygmaea alpine meadow transformed from significantly positive association at 128 and 224 burrow en- trances per ha to a negative association at 368 and 544 burrow entrances per ha. The relationship between K. pygmaea and Carex moorcroftii transformed from positive association at 128 and 224 active burrow entrances per ha to negative association at 368 and 544 active burrow entrances per ha, while associations between Eu-phorbia esula and Elsholtzia densa , and between Oxytropis ochrocephala and E. esula were negative at 128 and 224 active burrow entrances per ha but positive at 368 and 544 burrow entrances per ha. These results sug- gested that the active burrow entrance densities regulated the overall interspecific association among the main plant species in K. pygmaea alpine meadow, and the interspecific association among the main plant species was strongest and the stability of the alpine meadow community was greatest at 224 active burrow entrances per ha.