草地学报2026，Vol.34Issue(3)：960-972,13.DOI:10.11733/j.issn.1007-0435.2026.03.020
封育与放牧下氮添加对植物功能群氮、磷含量的影响
Effects of Nitrogen Addition on Nitrogen and Phosphorus Contents of Plant Functional Groups under Fencing and Grazing Management
摘要
Abstract
Nitrogen deposition intensification influences nutrient cycling in grassland ecosystems,yet plant nutri-ent responses under grazing and enclosure remain unclear.This study conducted a two-year multi-level nitrogen addition experiment in an alpine steppe in Qinghai to investigate the responses of nitrogen(N)and phosphorus(P)contents at both the plant functional group and community levels to nitrogen addition under enclosure and grazing conditions.The results showed that N addition significantly increased the N concentrations in grasses,sedges,forbs,and the community as a whole(P<0.001),but had no significant effect on legumes(P>0.05);N addition significantly enhanced the P concentrations in grasses,sedges,and the community(P<0.001),while significantly reducing that in legumes and forbs(P<0.05).Management practices further regu-lated the nutrient response pathways:under enclosure condition,nitrogen addition primarily induced a phospho-rus dilution effect,thereby increasing the N∶P;while under grazing condition,it promoted nitrogen absorption and altered phosphorus dynamics,leading to an elevated N∶P,with the overall N∶P being higher in enclosed grasslands.The study demonstrated that grazing and fencing,as distinct management approaches,were key factors regulating the response of plant nutrients to nitrogen deposition in the alpine steppe,holding significant implications for understanding regional nutrient limitations and guiding sustainable grassland management.关键词
封育/放牧/养分添加/高寒草地/功能群/氮、磷含量Key words
Fencing/Grazing/Nutrients addition/Alpine grassland/Plant functional groups/Plant nitrogen and phosphorus content分类
农业科技引用本文复制引用
何丰媛,陈梦娇,任飞,刘鑫燕,李晓凤,李兰平,梁德飞,韩成龙..封育与放牧下氮添加对植物功能群氮、磷含量的影响[J].草地学报,2026,34(3):960-972,13.基金项目
青海省帅才科学家负责制项目(2024-SF-102) （2024-SF-102）
国家自然科学基金(U21A20185,31901171) （U21A20185,31901171）
青海大学省部共建三江源生态与高原农牧业国家重点实验室开放研究项目(2019-KF-001)资助 （2019-KF-001）
