[1]WANG Rongrong,YU Hailong,LI Shiyao,et al.Review on the Effects of Soil Alternate Drying-Rewetting Cycle on Soil Respiration and Soil Organic Carbon Mineralization[J].Research of Soil and Water Conservation,2022,29(01):78-85.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 01
Page number:
78-85
Column:
Public date:
2022-02-20
- Title:
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Review on the Effects of Soil Alternate Drying-Rewetting Cycle on Soil Respiration and Soil Organic Carbon Mineralization
- Author(s):
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WANG Rongrong1, YU Hailong1, LI Shiyao1, FAN Jin1, HUANG Juying2
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(1.College of Resources and Environment, Ningxia University, Yinchuan 750021, China; 2.Environmental Engineering Research Institute, Ningxia University, Yinchuan 750021, China)
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- Keywords:
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soil alternate drying-rewetting cycle; soil respiration; soil microbe; priming effect
- CLC:
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S153.4
- DOI:
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- Abstract:
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Soil respiration priming effect caused by alternate drying-rewetting cycle is proved to commonly existe in arid, semi-arid and Mediterranean climate zones. Soil alternate drying-rewetting cycle is regarded as an important factor that influences soil respiration. During the soil alternate drying-rewetting process, a series of physical, chemical and biological changes happened, which leads to the ‘Birch effect' caused by the significant increase of soil CO2 emission. Under the future climate change, increasing frequency and intensity of extreme rainfall events is expected to happen, the extension and frequency of soil alternate drying-rewetting cycle may be enhanced in some regions, which will lead to the changes in soil moisture, intensify the soil drying-rewetting cycle, and in turn lead to soil respiration changes. We summarized the research progresses and underlying mechanisms of the effects of soil alternate drying-rewetting cycle on key processes of soil C cycling(especially soil respiration and priming effect of soil organic matter mineralization)from the aspects of soil aggregate, root respiration, and microbial respiration. Based on the comprehensive understanding of the theories of physiology and physics, it is concluded that soil alternate drying-rewetting mainly affects soil respiration and soil organic carbon mineralization by changes of soil structure, soil organic carbon decomposition rate, and structure and stability of soil microbial community. At present, available results of the effects of soil alternate drying-rewetting cycle on the key processes of soil carbon cycling(soil respiration and soil organic carbon mineralization)remain not consistent. The underlying mechanism is still not clear and some research methodological deficiencies need to be further explored and improved. In the end, some deficiencies in current research and possible key topics in the future study are proposed and pointed out.