Quantitative Analysis of Spatial-Temporal Variation and Driving Factors of Soil Freeze-Thaw in the Qinghai-Tibet Plateau from 2003 to 2022

被引：0

作者：

Zhang, Xiaolong ^{[1
]}

Zhao, Shangmin ^{[1
]}

Li, Shuzhen ^{[1
]}

机构：

[1] College of Geological and Surveying Engineering, Taiyuan University of Technology, Taiyuan

来源：

Journal of Geo-Information Science | 2025年 / 27卷 / 03期

基金：

中国国家自然科学基金;

关键词：

driving factors; Geodetector; permafrost; Qinghai-Tibet Plateau; soil freeze-thaw; spatial and temporal variation; temperature;

D O I：

10.12082/dqxxkx.2025

中图分类号：

学科分类号：

摘要：

[Objectives] The soil freeze-thaw process is a sensitive indicator of ecosystem and climate change in the Qinghai-Tibet Plateau. Studying its spatial and temporal variation characteristics is crucial for understanding the climate change and its ecological impacts in this region. [Methods] Based on ERA5-LAND surface temperature data from 2003 to 2022, the spatial and temporal variation characteristics of soil freezing start time, freezing end time, freezing duration, and freezing days in the Qinghai-Tibet Plateau were analyzed using the Theil-Sen slope estimation method and the Mann-Kendall test. The dominant factors influencing the spatial differentiation of freeze-thaw parameters were analyzed using the Geodetector method. Finally, correlation analysis was performed to explore the relationships between freeze-thaw parameters and the main driving factors. [Results] (1) The soil freeze-thaw process in the Qinghai-Tibet Plateau showed a trend of delayed freezing start times from northwest to southeast. Conversely, freezing end times, durations, and freezing days were significantly shortened, affecting 74.05% of the regional pixel area. (2) The four soil freeze-thaw parameters varied significantly across different regions over time. In permafrost regions, freezing initiation was delayed by 12.7 days, while freezing days were reduced by 20.4 days, showing the fastest changes. (3) Temperature was the dominant factor influencing the spatial differentiation of freezing days in the Qinghai-Tibet Plateau, with precipitation and NDVI also playing significant roles. The interaction of any two factors had a greater explanatory power than a single factor, with temperature’s influence being particularly significant when combined with other factors. (4) Across the Plateau, the four freeze-thaw parameters were significantly correlated with temperature changes but not with precipitation or NDVI. These parameters also showed clear gradient differences with altitudes: as altitude increased, freezing start times occurred earlier, end times were delayed, and freezing durations and freezing days were prolonged. [Conclusions] The results provide valuable data for further understanding the relationship between the soil freeze-thaw process and climate change. They also offer a theoretical basis for monitoring and predicting ecological and environmental changes in the Qinghai-Tibet Plateau. © 2025 Science Press. All rights reserved.

引用

页码：716 / 731

页数：15

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