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Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (5): 180-189.DOI: 10.7522/j.issn.1000-694X.2020.00075

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Review on response of soil carbon cycle to groundwater level change

Tianyan Su(), Wenjie Liu, Qiu Yang, Wei Mao()   

  1. College of Ecology and Environment,Hainan University,Haikou 570228,China
  • Received:2020-07-07 Revised:2020-08-19 Online:2020-09-28 Published:2020-09-28
  • Contact: Wei Mao

Abstract:

The fluctuation of groundwater tables affects the rate and degree of decomposition of litter and soil organic matter. It affects the microbial activity of soil, the turnover of plant root and the respiration rate of soil, and thus affects the accumulation and loss of SOC (soil organic carbon). The previous research mainly studied the influencing factors, e.g., temperature and precipitation, on the process of soil carbon conversion and the dynamic of carbon stock, lacking the understanding of how soil carbon cycle dynamics in different levels of underground water table due to the interaction of plant root system-microorganism-SOC. Based on this, this paper combined with the recent domestic and foreign soil carbon turnover process related research, summarizes the groundwater table effect on underground carbon distribution of plant roots, carbon metabolism of microbial communities and soil respiration in respective, and analyzes the dynamic relationship between groundwater depth and soil carbon cycle in-depth. The study benefit to reveal the soil carbon cycle dynamics in different groundwater depth, explain the uncertainty of regional terrestrial carbon sink assessment adequately, improve the terrestrial ecosystem carbon cycle model, and provide scientific theoretical support for terrestrial ecosystems to reply to the global changes.

Key words: groundwater depth, soil organic carbon, soil microorganisms, plant roots, soil respiration

CLC Number: