中国草地学报2025，Vol.47Issue(6)：1-9,9.DOI:10.16742/j.zgcdxb.20240266
氮磷添加对甘南高寒草甸植物生物量和物种多样性的影响
Effects of Nitrogen and Phosphorus Addition on Plant Biomass and Species Diversity in Alpine Meadows of the Gannan Region
摘要
Abstract
Nutrient enrichment is a key driver of plant diversity loss in grassland ecosystems.However,the specific pathways and mechanisms underlying species diversity reduction under different nutrient additions influence remain insufficiently understood.This study investigated the effects of nitrogen(N),phosphorus(P),and combined nitrogen and phosphorus(N+P)additions on alpine meadows located on the eastern edge of the Tibetan Plateau,using the natural community as a control.The main objective was to examine changes in species richness,biomass,and light transmission,and to elucidate the direct and indirect mechanisms contrib-uting to species richness decline under these experimental treatments.The results showed as follows:(1)N was identified as the primary limiting nutrient for aboveground biomass.Both N and N+P additions signifi-cantly increased aboveground biomass(P<0.05),primarily due to an increase in the biomass of grasses;(2)N and N+P additions significantly reduced species richness(P<0.05),whereas P addition alone had no sig-nificant effect;(3)The mechanisms underlying the reduction in species richness under N and N+P treatments were consistent and involved both direct effects of nitrogen and indirect effects via increased aboveground bio-mass,which in turn reduced light availability.关键词
氮添加/磷添加/高寒草甸/物种多样性/资源竞争Key words
Nitrogen addition/Phosphorus addition/Alpine meadow/Species diversity/Resource competition分类
农业科技引用本文复制引用
陈欢,王瑞兵,潘珍珍,赵维,蚌绍豪,周小龙,任正炜..氮磷添加对甘南高寒草甸植物生物量和物种多样性的影响[J].中国草地学报,2025,47(6):1-9,9.基金项目
国家自然科学基金(32060285) （32060285）
