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

IF 1.2 4区农林科学 Q4 SOIL SCIENCE Soil Research Pub Date : 2024-08-12 DOI:10.1071/sr23216

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

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Abstract

Context

Analysing freeze-thaw erosion is of great significance to ecological environment protection and land resource utilisation in high altitude areas.

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 to 2019.

Methods

We used a graded weighted evaluation model and a geographical detector method to analyse spatiotemporal pattern and driving factors of freeze-thaw erosion intensity in Qiangtang grasslands.

Key results

(1) From 2000 to 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 results show that in 2000–2019 the area of freeze-thaw erosion showed a downward trend. The erosion degree in the 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.

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中国羌塘草原冻融侵蚀强度的时空分布及其环境决定因素

背景分析冻融侵蚀对高海拔地区的生态环境保护和土地资源利用具有重要意义。目的我们利用气温、降水、植被覆盖度、海拔、坡度、坡向和含沙量 7 项指标计算了 2000 年至 2019 年不同季节的冻融侵蚀强度指数。方法我们采用分级加权评价模型和地理探测方法分析了羌塘草原冻融侵蚀强度的时空格局和驱动因素。主要结果（1）2000-2019 年，非生长季冻融侵蚀总面积高于生长季。非生长季中度及以上冻融侵蚀面积逐年增加，而生长季冻融侵蚀面积逐年减少。冻融侵蚀的空间分布主要取决于降水量和温度的年变化范围，这反映了冻融周期的强度和频率。(2) 植被覆盖是影响土壤湿度和稳定性的间接因素。坡度是影响不同地区冻融侵蚀空间分布的另一个重要因素。结果表明，2000-2019 年冻融侵蚀面积呈下降趋势。非生长季节的侵蚀程度呈上升趋势。意义我们的研究为了解羌塘草原冻融侵蚀的动态和机制提供了新的视角，有助于理解和管理水和气候变化对该地区的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Soil Research SOIL SCIENCE-

CiteScore

3.20

自引率

6.20%

发文量

审稿时长

4.5 months

期刊介绍： Soil Research (formerly known as Australian Journal of Soil Research) is an international journal that aims to rapidly publish high-quality, novel research about fundamental and applied aspects of soil science. As well as publishing in traditional aspects of soil biology, soil physics and soil chemistry across terrestrial ecosystems, the journal welcomes manuscripts dealing with wider interactions of soils with the environment. Soil Research is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.