草业学报2025，Vol.34Issue(11)：17-30,14.DOI:10.11686/cyxb2024523
不同围封年限对高寒草地植物群落的影响
Effects of the duration of grazing exclusion on plant communities in alpine grassland
摘要
Abstract
Large herbivores strongly influence plant communities and ecosystem processes in a variety of habitats.In this study,fencing was used to simulate the loss of large herbivores,and the"space-for-time substitutions"method was adopted to study the structure,aboveground net primary productivity,diversity and productivity-diversity relationships of alpine grassland plant communities after exclusion of grazers for different durations(0,3,5,8,10 years)in Haibei,Qinghai.The results show that:1)Grazing exclusion significantly changed the plant community structure of alpine grassland.With longer periods of grazing exclusion,the proportion of grasses in the community gradually increased,while the proportions of other functional groups(legumes,sedges,and forbs)gradually decreased,and internal heterogeneity within the communities gradually increased.2)The aboveground net primary productivity of the plant communities initially decreased and then increased as the duration of grazing exclusion extended,while litter mass showed the opposite trend.Grazing exclusion generally reduced species diversity,functional diversity,and phylogenetic diversity.3)There was a significant negative correlation between aboveground net primary productivity and Pielou's evenness index,Simpson's dominance index,Rao's quadratic entropy index,and mean nearest taxon distance,but no significant correlations with other diversity indices.These results indicate that the loss of large herbivores will significantly impact grassland ecosystems,particularly those in good health.Therefore,grazing exclusion should be carefully formulated based on the actual situation of grasslands.关键词
高寒草地/围栏封育/食草动物/多样性/生产力Key words
alpine grassland/grazing exclusion/herbivores/diversity/productivity引用本文复制引用
贺聪,马永才,字洪标..不同围封年限对高寒草地植物群落的影响[J].草业学报,2025,34(11):17-30,14.基金项目
国家自然科学基金(32401497),甘肃科技重大专项(23ZDNA009)和兰州大学"双一流"人才引进科研启动经费(561120230)资助. （32401497）
