草业学报2017，Vol.26Issue(3)：44-52,9.DOI:10.11686/cyxb2016145
牦牛粪沉积下高寒草甸植物群落种间关联研究
Interspecific associations in plant communities under yak dung depositions in an alpine meadow
摘要
Abstract
Plant community composition and interspecific associations reflect inter-dependence and competition between species,influencing their spatial distribution.To explore the evolutionary trends and stability mechanisms of grassland communities influenced by the interaction between yak dung depositions and vegetation we analyzed the importance values (Ⅳ) of different species,Jaccard association indices and Spearman rank correlation coefficients of the main species present in patches of grass/forb and Kobresia/forb swards under yak dung deposition in an alpine meadow on the northeast Qinghai-Tibetan Plateau.The results indicated that:1) dung deposition (DP) increased the Agropyron cristatum Ⅳ and decreased the Stipa krylovii Ⅳ in grass/forb patches,while decreasing the Kobresia capillifolia Ⅳ for Kobresia/forb parches;2) in grass/forb patches,the species-pairs ratios of positive and negative associations under DP and control (CK) were 0.61 and 0.63,respectively and their respective associated species-pairs were 6.6 ％ and 6.4％.For Kobresia/forb patches,the species-pairs ratio of positive and negative associations in DP and CK were 0.90 and 0.72,respectively and their respective associated species-pairs were 2.8％ in DP and 14.5％ in CK,exhibited mainly between the dominant or sub-dominant species and the companion species;3) the interspecific association of most species-pairs was weak in both vegetation types;yak dung strengthened the stability of Kobresia/forb patches benefiting the generation of grass/forb patches;4) according to their adaptability to environment and the key ecological factors affecting plants,the main plant species of two patches were divided into three ecological groups:shade-intolerant and drought-tolerant plants,shade-tolerant and drought-intolerant plants,and,shade-intolerant and drought-intolerant plants.关键词
粪斑/禾草/杂类草斑块/嵩草/杂类草斑块/重要值/Jaccard指数/Spearman秩相关Key words
dung patch/grass/forb patches/Kobresia/forb patches/important value/Jaccard association index/Spearman rank correlation引用本文复制引用
孔杨云,于应文,侯扶江..牦牛粪沉积下高寒草甸植物群落种间关联研究[J].草业学报,2017,26(3):44-52,9.基金项目
国家重点研发计划课题(2016YFC0501902),草地农业生态系统国家重点实验室2015年度开放课题和云南省高端科技人才引进项目(2012HA012)资助. （2016YFC0501902）
