ZhangNiZhuEtAl2022

Référence

Zhang, L., Ni, M., Zhu, T., Xu, X., Zhou, S., Shipley, B. (2022) Nitrogen Addition in a Tibetan Alpine Meadow Increases Intraspecific Variability in Nitrogen Uptake, Leading to Increased Community-level Nitrogen Uptake. Ecosystems, 25(1):172-183. (Scopus )

Résumé

Plant nitrogen (N) uptake is a critical ecosystem function, especially when terrestrial ecosystems are threatened worldwide by increasing anthropogenic N deposition. However, the mechanisms by which biotic factors mediate the effects of increases in N addition on community N uptake remain unknown. Here, we determine how inter- and intraspecific differences contribute to this response by decomposing N uptake in a specific community in a 7-year NH4NO3 addition experiment in a Tibetan alpine meadow using variance partitioning approach. We measured both plant N uptake from ammonium and nitrate of 25 common species in control plots and community-level uptake along a N addition gradient, using short-term in situ 15N labeling. Plant community composition, soil properties (soil ammonium and nitrate, pH, Al3+ and base cations), soil microbial biomass carbon and nitrogen were measured and recorded. We found that N addition increased community-level N uptake by significantly increasing individual species’ variability of N uptake (that is, positive intraspecific variability), although with limited effect of community composition shift. The significantly positive intraspecific variability from ammonium and nitrate along the N addition gradient was caused by increased soil available N and soil acidification with N addition. The limited effect of community composition shift means that N addition increased community-level N uptake with only limited species filtering. Our results provide a novel insight into the mechanism of how N addition affects community-level N uptake, by linking physiological, community and ecosystem function, and highlight the important role that intraspecific variability of N uptake plays. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.

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@ARTICLE { ZhangNiZhuEtAl2022,
    AUTHOR = { Zhang, L. and Ni, M. and Zhu, T. and Xu, X. and Zhou, S. and Shipley, B. },
    JOURNAL = { Ecosystems },
    TITLE = { Nitrogen Addition in a Tibetan Alpine Meadow Increases Intraspecific Variability in Nitrogen Uptake, Leading to Increased Community-level Nitrogen Uptake },
    YEAR = { 2022 },
    NOTE = { cited By 0 },
    NUMBER = { 1 },
    PAGES = { 172-183 },
    VOLUME = { 25 },
    ABSTRACT = { Plant nitrogen (N) uptake is a critical ecosystem function, especially when terrestrial ecosystems are threatened worldwide by increasing anthropogenic N deposition. However, the mechanisms by which biotic factors mediate the effects of increases in N addition on community N uptake remain unknown. Here, we determine how inter- and intraspecific differences contribute to this response by decomposing N uptake in a specific community in a 7-year NH4NO3 addition experiment in a Tibetan alpine meadow using variance partitioning approach. We measured both plant N uptake from ammonium and nitrate of 25 common species in control plots and community-level uptake along a N addition gradient, using short-term in situ 15N labeling. Plant community composition, soil properties (soil ammonium and nitrate, pH, Al3+ and base cations), soil microbial biomass carbon and nitrogen were measured and recorded. We found that N addition increased community-level N uptake by significantly increasing individual species’ variability of N uptake (that is, positive intraspecific variability), although with limited effect of community composition shift. The significantly positive intraspecific variability from ammonium and nitrate along the N addition gradient was caused by increased soil available N and soil acidification with N addition. The limited effect of community composition shift means that N addition increased community-level N uptake with only limited species filtering. Our results provide a novel insight into the mechanism of how N addition affects community-level N uptake, by linking physiological, community and ecosystem function, and highlight the important role that intraspecific variability of N uptake plays. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature. },
    AFFILIATION = { Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Coastal Ecosystems Research Station of the Yangtze River Estuary, Shanghai Institute of Eco-Chongming (SIEC), and School of Life Sciences, Fudan University, 2005 Songhu Road, Shanghai, 200438, China; Département de Biologie, Université de Sherbrooke, Sherbrooke, QC J1K 2R1, Canada; School of Resources and Environment, Anhui Agricultural University, 130 Changjiang West Road, Hefei, 230036, China; Karst Dynamics Laboratory, MLR & Guangxi, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, 541004, China; Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources, Chinese Academy of Sciences, 11A Datun Road, Chaoyang District, Beijing, 100101, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences (CAS), Beijing, 100101, China; Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, Ministry of Education, College of Forestry, Hainan University, Haikou, 570228, China },
    AUTHOR_KEYWORDS = { Community composition shifts; Intraspecific variability; N addition; Plant N uptake; Species turnover; Tibetan alpine meadow },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1007/s10021-021-00647-3 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-85107587116&doi=10.1007%2fs10021-021-00647-3&partnerID=40&md5=6aa7cbbbe3826d845d1890c83888f392 },
}

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