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Responses of nitrogen concentrations and pools to multiple environmental change drivers: A meta-analysis across terrestrial ecosystems

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DOI

  • Kai Yue, Sichuan Agricultural University
  • ,
  • Yan Peng, Københavns Universitet
  • ,
  • Dario A. Fornara, Agri-Food and Biosciences Institute, Belfast
  • ,
  • Koenraad Van Meerbeek, Department of Earth and Environmental sciences, KU Leuven University
  • ,
  • Lars Vesterdal, Københavns Universitet
  • ,
  • Wanqin Yang, Sichuan Agricultural University
  • ,
  • Changhui Peng, GEOTOP, Université du Québec à Montréal
  • ,
  • Bo Tan, Sichuan Agricultural University
  • ,
  • Wei Zhou, Sichuan Agricultural University
  • ,
  • Zhenfeng Xu, Sichuan Agricultural University
  • ,
  • Xiangyin Ni, Sichuan Agricultural University
  • ,
  • Li Zhang, Sichuan Agricultural University
  • ,
  • Fuzhong Wu, Sichuan Agricultural University
  • ,
  • Jens Christian Svenning

Aim: We sought to understand how the individual and combined effects of multiple environmental change drivers differentially influence terrestrial nitrogen (N) concentrations and N pools and whether the interactive effects of these drivers are mainly antagonistic, synergistic or additive. Location: Worldwide. Time period: Contemporary. Major taxa studied: Plants, soil, and soil microbes in terrestrial ecosystems. Methods: We synthesized data from manipulative field studies from 758 published articles to estimate the individual, combined and interactive effects of key environmental change drivers (elevated CO 2 , warming, N addition, phosphorus addition, increased rainfall and drought) on plant, soil, and soil microbe N concentrations and pools using meta-analyses. We assessed the influences of moderator variables on these effects through structural equation modelling. Results: We found that (a) N concentrations and N pools were significantly affected by the individual and combined effects of multiple drivers, with N addition (either alone or in combination with another driver) showing the strongest positive effects; (b) the individual and combined effects of these drivers differed significantly between N concentrations and N pools in plants, but seldom in soils and microbes; (c) additive effects of driver pairs on N concentrations and pools were much more common than synergistic or antagonistic effects across plants, soils and microbes; and (d) environmental and experimental factors were important moderators of the individual, combined and interactive effects of these drivers on terrestrial N. Main conclusions: Our results indicate that terrestrial N concentrations and N pools, especially those of plants, can be significantly affected by the individual and combined effects of environmental change drivers, with the interactive effects of these drivers being mostly additive. Our findings are important because they contribute to the development of models to better predict how altered N availability affects ecosystem carbon cycling under future environmental changes.

OriginalsprogEngelsk
TidsskriftGlobal Ecology and Biogeography
Vol/bind28
Nummer5
Sider (fra-til)690-724
Antal sider35
ISSN1466-822X
DOI
StatusUdgivet - maj 2019

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