草业科学2026，Vol.43Issue(1)：101-112,12.DOI:10.11829/j.issn.1001-0629.2025-0012
青海贵南高寒草甸垂穗披碱草功能性状对长期放牧的响应
Response of functional traits of Elymus nutans to long-term grazing in Guinan alpine meadow,Qinghai
摘要
Abstract
Plant traits can be altered by grazing,wherein phenotypic plasticity is related to grazing intensity.Three grazing intensity plots,including a no grazing control and light and heavy grazing groups,were selected at the Guinan County,Qinghai Province.The modular characteristics and the phenotypic plasticity index were calculated to explore the impacts of grazing intensity on the functional traits of Elymus nutans in alpine meadow.The results showed that:1)Compared with the no grazing group,grazing treatment significantly reduced crown width,nutrient branch height,reproductive branch height,tiller number,leaf number,leaf thickness,leaf shape index,and average leaf area of E.nutans(P<0.05).2)Grazing significantly reduced the stoichiometric characteristics such as leaf carbon content,carbon nitrogen ratio,carbon phosphorus ratio,and nitrogen phosphorus ratio(P<0.05).3)The total aboveground biomass of E.nutans and the nutrient and reproductive branch weights were significantly reduced after long-term grazing(P<0.05),and the proportion of nutrient branch weight decreased with increasing of grazing intensity.4)Leaf dry matter content was insensitive to grazing and was an inert trait,while reproductive branch weight and total aboveground biomass were the most sensitive traits.Therefore,grazing significantly altered the functional traits of E.nutans,and the plasticity of phenotypic traits was influenced by grazing intensity.E.nutans adopted a rapid resource-based adaptation strategy to grazing.Appropriately adjusting grazing intensity provides valuable insights for grassland health and sustainable use.关键词
放牧强度/结构性状/化学性状/表型可塑性/化学计量特征/功能性状/适应策略Key words
grazing intensity/structural traits/chemical traits/phenotypic plasticity/stoichiometric characteristics/functional traits/adaptation strategy引用本文复制引用
孙平,许明圆,王娅琳,赵娜,徐世晓,赵新全..青海贵南高寒草甸垂穗披碱草功能性状对长期放牧的响应[J].草业科学,2026,43(1):101-112,12.基金项目
青海省帅才科学家项目(2024-SF-102) （2024-SF-102）
