Abstract
In order to learn the relevant characteristics of soil erosion of highway slope in the permafrost region of the Qinghai-Tibet Plateau, the different characteristics of the erosion area were analyzed in this paper firstly. Then based on ArcGIS and RUSLE modes and gray correlation analysis, the spatial and temporal differentiation characteristics of soil erosion in the area were proposed. The results showed that soil erosion was mainly concentrated in June to September, and the date of the project construction should be avoided as much as possible; The erosion intensity was slightly and mildly and gradually weakened from south to north. Theoretical research results will have important theoretical and technical significance for the prevention and control of soil erosion of highway slope in the permafrost area of the Qinghai-Tibet Plateau.
Highlights
Due to global climate change and the westward shift of national development strategy, the intensification of permafrost melting, the degradation of high-cold meadows and grassland vegetation, the intensification of soil erosion, and the rapid development of soil desertification had been experienced in the Qinghai-Tibet Plateau
The study found that the potential soil erosion of the ecosystems of the Qinghai-Tibet Plateau was as high as 3.09 × 1010t/a[1], and the economic value of soil conservation function was 1.5×108 - 4.6×108 RMB/a for the high-cold meadow ecosystem[2]
Combined with the soil erosion characteristics and the basic conditions of ecological protection in the permafrost area of the Qinghai-Tibet Plateau mentioned above, the three indicators of land use, vegetation cover (C value) and soil erosion intensity were selected, and the ecological protection in the region was defined as three levels from priority to difficulty, and divided into five grades
Summary
Due to global climate change and the westward shift of national development strategy, the intensification of permafrost melting, the degradation of high-cold meadows and grassland vegetation, the intensification of soil erosion, and the rapid development of soil desertification had been experienced in the Qinghai-Tibet Plateau. There were many studies on soil erosion in the Qinghai-Tibet Plateau area, but they mainly focus on the space-time changes of small-scale soil erosion, or on the soil conservation function and its value of ecosystems, or on soil erosion of a single ecosystem type, as well as the control factors of small-scale soil erosion, and there was little research on permafrost areas of the Qinghai-Tibet Plateau. In this topic, we first summarized the erosion area difference characteristics of the permafrost area of the Qinghai-Tibet Plateau, and based on ArcGIS and RUSLE models, as well as the mapping of topographical features, vegetation and other factors or remote sensing data and the classification criteria according to soil erosion, to reveal the space-time and space-time separation characteristics of the permafrost area of the Qinghai-Tibet Plateau
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