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Responses of CO 2 emission to external organic carbon input in the drying-rewetting cycles: a meta-analysis
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  • Junjie Lin,
  • Hongxin Dong,
  • Dan Liu,
  • Kehong Wang,
  • Zhiguo Yu,
  • Amit kumar
Junjie Lin
Chongqing Three Gorges University

Corresponding Author:junjielin@sanxiau.edu.cn

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Hongxin Dong
Chongqing Three Gorges University
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Dan Liu
Department of Agricultural and Forestry Science and Technology Chongqing Three Gorges Vocation College Chongqing 404000 China
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Kehong Wang
Chongqing Three Gorges University
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Zhiguo Yu
Nanjing University of Information Science and Technology
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Amit kumar
Nanjing University of Information Science and Technology
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Abstract

In recent decades, global warming under rising CO 2 significantly influences external organic carbon (EOC) input and drying-rewetting processes in terrestrial ecosystems. However, little is known about how soil CO 2 emissions respond to these perturbations, which provides us with a chance to explore potential factors and variability. In this study, a meta-analysis on the responses of CO 2 emissions with or without EOC input in the soil drying-rewetting cycles (DWC) based on 291 observations (included 33 study sites and 11 variables) has been conducted. The results indicated that i) CO 2 emission with the increase of EOC by 284% relative to without EOC under DWC; ii) The effect size of CO 2 emission was the smallest in the forest (+15%) and the largest in the grassland (+1468%); iii) The CO 2 emission effect sizes were substantially greater in complex substrates (+288%) than in simple substrates (+132%), and iv) longer drought period in a DWC can induce more CO 2 emission. The study suggests that terrestrial CO 2 emission may be multi folds in the long drought-rapid rewetting processes under large input of EOC.