草地学报2026，Vol.34Issue(2)：403-414,12.DOI:10.11733/j.issn.1007-0435.2026.02.003
放牧强度对羊草草甸草原植物群落组成及生态位的影响
The Influences of Grazing Intensity on the Composition of Plant Communities and Ecological Niches in the Leymus chinensis Meadow Steppe
摘要
Abstract
This study aimed to explore the changes and linkages of plant community species diversity and niche under different grazing intensities in(Leymus chinensis)meadow steppe,providing a basis for rational utilization of grassland resources.Taking plant communities in Leymus chinensis meadow steppe under six grazing intensi-ties,including no grazing(G0=0 cow.AU∙hm-2),light grazing(G1=0.23 cow.AU∙hm-2),light-moderate grazing(G2=0.34 cow.AU∙hm-2),moderate grazing(G3=0.46 cow.AU∙hm-2),moderate-heavy grazing(G4=0.69 cow.AU∙hm-2),and heavy grazing(G5=0.92 cow.AU∙hm-2),as research materials,we con-ducted plant community surveys and calculated diversity indices and niche indices.The results showed that diversity indices first increased and then decreased with increasing grazing intensity,peaking at moderate graz-ing.The species importance values changed significantly,where the dominant position of Leymus chinensis was replaced by Carex duriuscula as the important values gradually decreased.The importance value was positively correlated with niche breadth,and the correlation was the strongest under light-moderate grazing and moderate grazing.The niche overlap value first increased and then decreased,while the interspecific competition pressure remained stable under light-moderate grazing and moderate grazing.Therefore,controlling the number of graz-ing livestock based on the niche breadth and overlap value of species could help stabilize the grassland ecosystem and facilitate the sustainable utilization of grasslands.关键词
放牧强度/物种多样性/生态位宽度/生态位重叠/草甸草原Key words
Grazing intensity/Species diversity/Niche breadth/Niche overlap/Meadow steppe分类
农业科技引用本文复制引用
毕鑫,俞天琦,侍梦圆,辛晓平,张智涛,闫瑞瑞,韩国栋..放牧强度对羊草草甸草原植物群落组成及生态位的影响[J].草地学报,2026,34(2):403-414,12.基金项目
国家自然基金面上项目(32371781) （32371781）
国家重点研发计划项目(2021YFD1300503) （2021YFD1300503）
中央级公益性科研院所基本科研业务费专项(1610132024003) （1610132024003）
内蒙古中央引导地方科技发展资金(2025ZY0018) （2025ZY0018）
内蒙古自治区科技"突围"工程"揭榜挂帅"项目(2025KJTW0025-03) （2025KJTW0025-03）
呼伦贝尔市科技计划项目(SF2023007) （SF2023007）
内蒙古科技厅(2022PT0003) （2022PT0003）
草学学科(YLXKZX-NND-001)资助 （YLXKZX-NND-001）
