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Functional Trait Divergence Underlies the Spatial Trade-Off Between Water and Nitrogen Use Efficiencies in Northern Tibetan Alpine Grasslands

文献类型：期刊论文

作者Zhao, Guangshuai4; Yan, Mingcong3; Shi, Peili1,2; Chen, Xueying1,2; Hei, Huixin2
刊名PLANTS-BASEL
出版日期2026-04-01
卷号15期号:7页码:1076
关键词alpine grasslands precipitation gradient functional trait divergence resource use efficiency spatial trade-off nitrogen limitation
ISSN号2223-7747
DOI10.3390/plants15071076
产权排序3
文献子类Article
英文摘要The coupling of water and nitrogen (N) availability critically constrains alpine plant growth and ecosystem productivity, yet the mechanistic links between plant functional traits and resource use efficiencies (rain use efficiency, RUE; nitrogen use efficiency, NUE) along precipitation gradients remain unclear. This study aimed to test whether coordinated shifts in plant functional traits are associated with spatial variation in RUE and NUE across a precipitation gradient on the Changtang Plateau. Here, combining transect surveys with N-addition experiments on the Changtang Plateau, we measured biomass and leaf/root functional traits on four typical grasslands and analyzed the spatial variations in RUE, NUE, and fertilizer use efficiency (FUE). Our results demonstrated contrasting spatial patterns: with increasing precipitation, soil resource availability, community species richness, and biomass significantly improved, and vegetation shifted from a water-conservative strategy in arid regions to a nutrient-efficient strategy in humid regions. FUE increased with precipitation (p < 0.05), with low-dose nitrogen addition exerting more pronounced effects in humid regions, indicating greater responsiveness to fertilization. This transition in resource use patterns is underpinned by a coordinated divergence in functional traits: as water limitation eases, communities exhibited decreasing specific root length (high specific root length, SRL) coupled with increasing specific leaf area (high specific leaf area, SLA) along the gradient. Our findings demonstrate that functional trait variation is associated with the optimization of resource acquisition across environmental gradients. These results provide a mechanistic basis for adaptive management in climate-sensitive alpine biomes, where differentiated grassland management schemes may enhance ecosystem productivity-water conservation and reduced disturbance in arid regions, with moderate low-dose nitrogen fertilization and species diversity protection in humid regions. Long-term ecosystem responses to such management approaches require further investigation.
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WOS关键词LEAF LIFE-SPAN ; PRECIPITATION GRADIENT ; SPECIES RICHNESS ; INNER-MONGOLIA ; PLANT TRAITS ; ROOT TRAITS ; CARBON ; NUTRIENT ; AREA ; ECOSYSTEM
WOS研究方向Plant Sciences
语种英语
WOS记录号WOS:001739343500001
出版者MDPI
源URL[http://ir.igsnrr.ac.cn/handle/311030/221561]  
专题拉萨站高原生态系统研究中心_外文论文
通讯作者Shi, Peili
作者单位1.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modelling, Beijing 100101, Peoples R China;
3.Beijing Forestry Univ, Sch Econ & Management, Beijing 100083, Peoples R China;
4.Natl Forestry & Grassland Adm, Dev Res Ctr, Beijing 100714, Peoples R China;
推荐引用方式
GB/T 7714		 Zhao, Guangshuai,Yan, Mingcong,Shi, Peili,et al. Functional Trait Divergence Underlies the Spatial Trade-Off Between Water and Nitrogen Use Efficiencies in Northern Tibetan Alpine Grasslands[J]. PLANTS-BASEL,2026,15(7):1076.
APA Zhao, Guangshuai,Yan, Mingcong,Shi, Peili,Chen, Xueying,&Hei, Huixin.(2026).Functional Trait Divergence Underlies the Spatial Trade-Off Between Water and Nitrogen Use Efficiencies in Northern Tibetan Alpine Grasslands.PLANTS-BASEL,15(7),1076.
MLA Zhao, Guangshuai,et al."Functional Trait Divergence Underlies the Spatial Trade-Off Between Water and Nitrogen Use Efficiencies in Northern Tibetan Alpine Grasslands".PLANTS-BASEL 15.7(2026):1076.

入库方式： OAI收割

来源：地理科学与资源研究所

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