Increased microbial sequestration of soil organic carbon under nitrogen deposition over China’s terrestrial ecosystems

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DOI

  • Shu Liao, Fujian Normal University
  • ,
  • Siyi Tan, Fujian Normal University
  • ,
  • Yan Peng, Københavns Universitet
  • ,
  • Dingyi Wang, Fujian Normal University
  • ,
  • Xiangyin Ni, Fujian Normal University
  • ,
  • Kai Yue, Fujian Normal University
  • ,
  • Fuzhong Wu, Fujian Normal University
  • ,
  • Yusheng Yang, Fujian Normal University

Background: China’s terrestrial ecosystems have been receiving increasing amounts of reactive nitrogen (N) over recent decades. External N inputs profoundly change microbially mediated soil carbon (C) dynamics, but how elevated N affects the soil organic C that is derived from microbial residues is not fully understood. Here, we evaluated the changes in soil microbial necromass C under N addition at 11 forest, grassland, and cropland sites over China’s terrestrial ecosystems through a meta-analysis based on available data from published articles. Results: Microbial necromass C accounted for an average of 49.5% of the total soil organic C across the studied sites, with higher values observed in croplands (53.0%) and lower values in forests (38.6%). Microbial necromass C was significantly increased by 9.5% after N addition, regardless of N forms, with greater stimulation observed for fungal (+ 11.2%) than bacterial (+ 4.5%) necromass C. This increase in microbial necromass C under elevated N was greater under longer experimental periods but showed little variation among different N application rates. The stimulation of soil microbial necromass C under elevated N was proportional to the change in soil organic C. Conclusions: The stimulation of microbial residues after biomass turnover is an important pathway for the observed increase in soil organic C under N deposition across China’s terrestrial ecosystems.

OriginalsprogEngelsk
Artikelnummer52
TidsskriftEcological Processes
Vol/bind9
DOI
StatusUdgivet - sep. 2020

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