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[1]CHEN Junhan,LU Qi,LIU Yuqing,et al.Distribution and Influencing Factors of Freeze-thaw Desertification Degradation in Qinghai-Tibet Plateau[J].Research of Soil and Water Conservation,2023,30(03):103-110,120.[doi:10.13869/j.cnki.rswc.2023.03.044]

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Distribution and Influencing Factors of Freeze-thaw Desertification Degradation in Qinghai-Tibet Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 03 Page number: 103-110,120 Column: Public date: 2023-04-10

Title:: Distribution and Influencing Factors of Freeze-thaw Desertification Degradation in Qinghai-Tibet Plateau

Author(s):: CHEN Junhan^1,2, LU Qi^1,2, LIU Yuqing^1,2, HE Chenyang^1,2, YAN Feng^1,2; (1.Institute of Ecological Conservation and Restoration, Chinese Academy of Forestry, Beijing 100091, China; 2.Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China)

Keywords:: desertification; freeze-thaw; land degradation; Qinghai-Tibet Plateau

CLC:: S181

DOI:: 10.13869/j.cnki.rswc.2023.03.044

Abstract:: [Objective]The Qinghai-Tibet Plateau(QTP)is the main distribution area of freeze-thaw desertification in China due to its high altitude, low temperature, and intense freeze-thaw erosion. To explore the distribution and causes of freeze-thaw degradation areas on the QTP has important reference significance for soil and water conservation and ecological environment protection in this area. [Methods] Six main factors affecting freeze-thaw erosion were selected in this study to evaluate the freeze-thaw erosion sensitivity in the QTP: vegetation coverage, days of freeze-thaw cycle, daily range of soil temperature, soil moisture content, annual precipitation and slope. Combined with the desertification trend of the QTP during the study period, a method was established to determine the degraded zones of freeze-thaw desertification. [Results] In 2000—2019, the total area of freeze-thaw erosion area was 1.531×10⁶ km², and the area of moderate and above sensitivity was 9.131×10⁵ km², accounting for 35.92% of the total area of the QTP. The area of freeze-thaw desertification degradation zones in the QTP was 1.113×10⁵ km², mainly distributed in the southwest of the plateau, and the degradation degree was mainly moderate, accounting for 44.35%. [Conclusion] In general, the increase of annual average temperature, the decrease of moisture index and the increase of net solar radiation are the main natural driving factors for freeze-thaw desertification in the QTP, while in some parts of the south plateau, the three factors play the opposite roles due to different environmental conditions.

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Last Update: 2023-04-10