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Spatial and temporal distribution and environmental determinants of freeze-thaw erosion intensity in Qiangtang grasslands,China

Gaobo Zhang , Xiaohuang Liu, Jinjie Wang, Jiufen Liu, Xiaofeng Zhao, Hongyu Li, Ran Wang, Xinping Luo, Liyuan Xing, Chao Wang, Honghui Zhao

Abstract

Abstract: Context: Analyzing freeze-thaw erosion is of great significance to ecological environment protection and land resource utilization in high altitude areas. Methods: We used a graded weighted evaluation model and a geographic detector method to analyze Spatial-temporal pattern and driving factors of freeze-thaw erosion intensity in Qiangtang grasslands. Aims: We used seven indicators (temperature, precipitation, vegetation cover, elevation, slope, slope orientation, and sand content) to calculate the freeze-thaw erosion intensity index for different seasons from 2000-2019. Key results: 1) From 2000-2019, the total area of freeze-thaw erosion was higher in the non-growing season than in the growing season. The area of moderate and above-average freeze-thaw erosion increased over time in the non-growing season but decreased in the growing season. The spatial distribution of freeze-thaw erosion was mainly determined by the annual range of precipitation and temperature, which reflect the intensity and frequency of freezing and thawing cycles. 2) Vegetation cover was an indirect factor that influenced the soil moisture and stability. The slope was another important factor that affected the spatial distribution of freeze-thaw erosion in different regions. Conclusions: The result show, 2000-2019, the area of freeze-thaw erosion showed a downward trend. The erosion degree in non-growing season is on the rise. Implications: Our study provides new insights into the dynamics and mechanisms of freeze-thaw erosion in Qiangtang grasslands and contributes to the understanding and management of water and climate change impacts on this region.

SR23216  Accepted 25 July 2024

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