草业学报2026，Vol.35Issue(3)：13-25,13.DOI:10.11686/cyxb2025113
东祁连山高寒草甸山生柳灌木扩张对草本植物群落特征的影响
Impact of Salix oritrepha shrub encroachment on characteristics of herbaceous plant communities in the alpine meadows of the Eastern Qilian Mountains
摘要
Abstract
Exploring the impacts of shrub encroachment on the characteristics of herbaceous plant communities in the alpine meadows of the Eastern Qilian Mountains is important both for understanding local ecological equilibrium and for the development of animal husbandry.This study was carried out in alpine meadows dominated by Salix oritrepha in Tianzhu,Gansu Province.Using a space-for-time substitution method,we assessed differences in plant height,coverage,and aboveground biomass across various functional groups,and species diversity indexes,under light,moderate,and heavy levels of shrub encroachment in both shrub and grass patches.As shrub encroachment intensified,herbaceous plant height increased in both patch types,whereas the cover of sedges declined and the aboveground biomass of grasses remained stable.The composition of forbs shifted significantly,with Equisetum arvense becoming dominant under severe shrub encroachment.Species richness,Shannon-Wiener diversity,Simpson's dominance,and Pielou's evenness indexes all decreased in shrub patches as shrub encroachment intensified.Correlation analysis revealed a significant negative relationship between herbaceous species diversity and the plant height and canopy size of S.oritrepha.Overall,the results of this study show that S.oritrepha expansion has both suppressive and facilitative effects on herbaceous communities,with the extent of these effects varying depending on the plant functional group and the degree of shrub encroachment.关键词
高寒灌丛草甸/灌丛化/草本植物功能群/物种多样性Key words
alpine shrub meadow/shrub encroachment/herbaceous plant functional groups/species diversity引用本文复制引用
刘阳,肖红,徐长林,邓明月,魏文强,韩奥,马凯,王昀..东祁连山高寒草甸山生柳灌木扩张对草本植物群落特征的影响[J].草业学报,2026,35(3):13-25,13.基金项目
国家自然科学基金项目(32301509),对口支援科研联合基金项目(GSAU-DKZY-2025-004)和甘肃农业大学公招博士科研启动基金项目(GAU-KYQD-2021-01)资助. （32301509）
