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Seed nutrient is more stable than leaf in response to changing multiple resources in an alpine meadow

Ecological Processes 2023年第1期12卷 589-597页

作者： Jiapu Li Dashuan Tian Kailiang Yu Hongbo Guo Ruiyang Zhang Jinsong Wang Qingping Zhou Shuli Niu Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of resources and Environmental Sciences Nanjing Agricultural UniversityNanjing 210095China College of resources and Environment University of Chinese Academy of SciencesBeijing 100101China Institute of Qinghai-Tibetan Plateau Southwest Minzu UniversityChengdu 610041China High Meadows Environmental Institute Princeton UniversityPrinceton 02138USA

Background It has been long thought that nitrogen(N),phosphorus(P)concentrations and their ratios(N:P)in metabolically active or functional organs(i.e.,leaves)are less responsive to environmental *** attention,however,has been paid to the reproductive organs-seeds,while seeds may maintain their nutrients more stable for the evolutionary fitness of next *** Here,we conducted a field experiment of N,P addition and drought in an alpine meadow,aiming to compare the difference of leaf and seed nutrients and stoichiometric ratios in response to these resource treatments and their *** dominant species were selected among grass and forb functional groups,including Elymus nutans,Deschampsia caespitosa,Artemisia roxburghiana and Polygonum *** Under natural conditions,leaf N and P concentrations were consistently lower than seed among ***,leaf nutrients were much more sensitive than seed nutrients to N and P ***,N or P addition accordingly increased leaf N or P concentration by 22.20-44.24%and 85.54-93.61%,while only enhanced seed N or P concentration by 5.15-17.20%and 15.17-32.72%,*** N or P concentration was significantly reduced by P or N addition,but seed nutrients remained *** contrast,drought did not change both organ ***,nutrient addition and drought had synergistic interactions on leaf nutrients,but not on seed *** This study highlights that seed nutrient concentrations could be more stable than metabolically active leaf organ when facing multidimensional resource *** complements the traditional view on the‘Stable Leaf Nutrient Hypothesis’with the involvement of reproductive *** less responsiveness of seed nutrients suggests the adaptive strategy to ensure the success of next generations and long-term plant demographic stability.

关键词： Alpine meadow Leaf multiple resource change Nitrogen concentration N:P ratio Phosphorus concentrations Seed

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