Contrasting responses after fires of the source components of soil respiration and ecosystem respiration

Ji Chen, Yuefang Zhang, Yiqi Luo, Xuhui Zhou, Yu Jiang, Jin Zhao, Yizhao Chen, Chao Wang, Liang Guo, Junji Cao

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Wildfire is an important ecological disturbance that can have cascading effects on ecosystem carbon (C) fluxes. Ecosystem respiration (ER) and soil respiration (SR) account for two of the largest terrestrial C fluxes to the atmosphere, and they play critical roles in regulating C–climate feedbacks. Here, the responses of ER, SR and their source components to experimental burning in a meadow grassland on the Tibetan Plateau were investigated. Fire treatment increased ER by 9% but decreased SR by 15%. The contrasting post-fire responses of SR and ER can be explained by the behaviour of their source components; that is, fire increased aboveground plant respiration (Ragb) by 37%, but decreased heterotrophic respiration (HR) by 21%. Increases in ER and Ragb were mainly related to enhanced plant productivity, whereas smaller SR and HR were associated with reductions in microbial biomass and soil moisture. Accounting for the responses of ER, SR and their intrinsic components has advanced our understanding of how fire affects ecosystem C fluxes. Highlights: Fire treatment increased ecosystem respiration (ER) and aboveground plant respiration. Fire treatment decreased soil respiration (SR) and heterotrophic respiration (HR). Increases in ER and aboveground plant respiration were related to plant productivity. Reductions in SR and HR were caused by the suppressed microbial activity.

Original languageEnglish (US)
Pages (from-to)616-629
Number of pages14
JournalEuropean Journal of Soil Science
Volume70
Issue number3
DOIs
StatePublished - May 2019

Keywords

  • autotrophic respiration
  • ecosystem respiration
  • fire disturbance
  • heterotrophic respiration
  • microbial biomass
  • plant functional types
  • plant productivity
  • soil respiration

ASJC Scopus subject areas

  • Soil Science

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