高原农业2025，Vol.9Issue(6)：730-738,9.DOI:10.19707/j.cnki.jpa.2025.06.006
氮添加对青藏高原色季拉山高寒草地植物的影响
Effect of Nitrogen Addition on Plants in Alpine Grassland of Sejila Mount on the Qinghai-Xizang Plateau
摘要
Abstract
A long-term nitrogen addition experiment with different gradients was conducted in the alpine grassland of Sejila Mountain in Linzhi City,Xizang,to explore the response of alpine grassland plant communities to the intensification of atmospheric nitrogen deposition.The effects and patterns of variation of nitrogen addition on plant functional groups,community biomass,nutrient content,and stoichiometric ratio characteristics were systematically analyzed.The results indicated that nitrogen addition promoted an increase in plant community biomass and root-shoot ratio,but with the increase in nitrogen addition concentration,the aboveground biomass of Poaceae and forbs decreased.Nitrogen addition significantly reduced the carbon(C)content of the plant community,while increasing the nitrogen(N)and phosphorus(P)contents of plants.Under the N15 treatment,the aboveground N content increased by 8.34%,and the P content increased by 24.20%,thereby changing the stoichiometric ratio of plants(P<0.05).However,high-concentration nitrogen addition reduced the N and P contents of plants and increased the nitrogen-to-phosphorus ratio(N:P),causing the plant community to shift from nitrogen-limited to co-limited by nitrogen and phosphorus.关键词
氮添加/高寒草地/生物量/养分含量/计量比Key words
Nitrogen addition/Alpine grassland/Biomass/Nutrient content/Stoichiometric ratio分类
农业科技引用本文复制引用
张西哲,陶江,牛紫悠,崔志攀,韩艳英,叶彦辉..氮添加对青藏高原色季拉山高寒草地植物的影响[J].高原农业,2025,9(6):730-738,9.基金项目
西藏农牧大学研究生教育创新计划项目(YJS2024-26,YJS2024-28,YJS2024-31) （YJS2024-26,YJS2024-28,YJS2024-31）
国家自然科学基金项目(31860141,31360119) （31860141,31360119）
国家级大学生创新创业训练计划项目(2024-02) （2024-02）
西藏林芝苹果科技小院(XY2024-03)和西藏农牧大学重点学科建设项目(XK20245-04),西藏高原林业生态工程重点实验室资助. （XY2024-03）
