中国草地学报2025，Vol.47Issue(10)：73-82,10.DOI:10.16742/j.zgcdxb.20240474
不同载畜率对荒漠草原植物功能群特征及其生产力贡献的影响
Effects of Different Stocking Rates on Characteristics and Productivity Contribution of Plant Functional Groups in Stipa breviflora Desert Steppe
摘要
Abstract
This research was conducted in the Stipa breviflora desert steppe of Siziwang Banner,Inner Mongolia.We established four stocking-rate treatments 0,0.91,1.82,and 2.71 sheep/(hm2·a)and plant community was categorized into five plant functional groups-perennial rhizomatous grasses,perennial forbs,perennial bunchgrasses,annual-biennial herbs,and shrubs/sub-shrubs.Quadrat sampling was used to measure plant height,cover,density,above-ground biomass,and species composition in August 2022.We calculated importance values and applied principal component analysis(PCA)to evaluate productivity-diversity coupling.Results showed that:(1)Species richness exhibited a hump-shaped response to stocking rate(22,24,22,and 21 species,respectively),while morphological traits and pro-ductivity of the plant functional groups generally declined with increasing grazing pressure.(2)Importance-value analysis showed that the relative importance of perennial bunchgrasses increased from 40%to 68%,while their contribution to community productivity rose from 60%to 95%.PCA further indicated that pro-ductivity and diversity together accounted for 66.12%of the variance,which was primarily driven by this functional group.(3)A positive linear relationship was observed between species richness and productivity in the perennial forb group under no grazing,light grazing,and moderate grazing,whereas this relationship under heavy grazing was found in shrubs/sub-shrubs group.No other functional groups exhibited signifi-cant correlations.These results demonstrate that while stocking rate significantly alters plant functional group composition,species diversity alone is not a direct determinant of productivity,indicating complex interactions among disturbance,diversity,and productivity.Since perennial bunchgrasses play a crucial role in supporting productivity at higher stocking rates,grazing management strategies should prioritize the conservation and regulation of this functional group to ensure sustainable use and the ecological stability of the desert steppe.关键词
载畜率/荒漠草原/物种多样性/功能群/生产力Key words
Stocking rate/Desert steppe/Species diversity/Functional group/Productivity分类
农业科技引用本文复制引用
王煜鑫,王瑞,鞠馨,张晓嘉,韩国栋..不同载畜率对荒漠草原植物功能群特征及其生产力贡献的影响[J].中国草地学报,2025,47(10):73-82,10.基金项目
内蒙古自治区林草局揭榜挂帅项目"草原保护与可持续管理碳汇方法学研发与应用"(2024LKY-TH02) （2024LKY-TH02）
内蒙古自治区高校铸牢中华民族共同体意识研究基地重大项目(ZLJD24034) （ZLJD24034）
