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[1]XU Ting,MA Lulu,LI Zesen,et al.Response of Soil Respiration to Changes of Rainfall Pattern in Naturally Restored Grassland in Loess Hilly Region[J].Research of Soil and Water Conservation,2023,30(05):92-98.[doi:10.13869/j.cnki.rswc.2023.05.004.]

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Response of Soil Respiration to Changes of Rainfall Pattern in Naturally Restored Grassland in Loess Hilly Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 05 Page number: 92-98 Column: Public date: 2023-08-10

Title:: Response of Soil Respiration to Changes of Rainfall Pattern in Naturally Restored Grassland in Loess Hilly Region

Author(s):: XU Ting¹, MA Lulu¹, LI Zesen¹, CAO Jiayi², YAN Nannan², JIAO Feng¹; (1.Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China)

Keywords:: loess hilly area; natural restoration of grassland; soil respiration; rainfall change

CLC:: X171

DOI:: 10.13869/j.cnki.rswc.2023.05.004.

Abstract:: [Objective] The response of soil respiration to long-term change of rainfall in naturally restored grassland in the loess hilly region was revealed, and the relationship between soil respiration and soil temperature and soil water content under different rainfall treatments was expounded. [Methods] The natural restoration of grassland communities in the loess hilly area was taken as the object. Long-term field artificially controlled rainfall experiment on setting 20%, 40%, 60% rain increase and 20%, 40%, 60% rain reduction and control treatments was conducted. Soil respiration, soil temperature, and soil water content were measured. [Results](1)Soil respiration under different rainfall treatments showed a unimodal curve in the growing season, reaching a maximum value in July and a minimum value in October. In the whole growing season, the increase of rainfall by 20% and the increase of rainfall by 60% had no significant effect on soil respiration. 40% increase in rainfall and 20%, 40% and 60% decrease in rainfall significantly inhibited soil respiration(p<0.05), which showed that soil respiration decreased with the increase of rainfall.(2)In the growing season, rainfall significantly affected soil water content(p<0.05), which decreased with the decrease of rainfall. Except for 60% decrease in rainfall treatment, the other rainfall treatments significantly decreased soil temperature(p<0.05).(3)Under the condition of no water stress, soil temperature and soil respiration in different rainfall treatments showed extremely significant exponential correlation(p<0.01). Soil water content and soil respiration in each rainfall treatment showed significant quadratic function correlation(p<0.05). The two factors of soil temperature and soil water content had the very significant linear and power-exponential correlation with soil respiration, repcectively, and the two-factor power-exponential model was optimal. [Conclusion] In general, the effect of rainfall on the soil respiration of the naturally restored grassland community in the loess hilly area is jointly regulated by soil temperature and soil water content, and its dominant degree depends on whether water stress occurs.

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Last Update: 2023-08-10