Study on the Characteristics of Soil Depletion and Degradation in the Coal Fire Area of the Southern Junggar Coalfield, Xinjiang, China

IF 3.6 2区农林科学 Q2 ENVIRONMENTAL SCIENCES

Land Degradation & Development Pub Date : 2025-01-30 DOI:10.1002/ldr.5457

Li Shen, Qiang Zeng

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引用次数: 0

Abstract

Coal mining can lead to coal spontaneous combustion, especially in arid and semi‐arid areas, and soil can suffer varying degrees of depletion and degradation, which can be harmful to the regional eco‐environment. However, the characteristics of soil depletion and degradation are not yet clear in the coal fire areas, and there are fewer soil quality assessments. In this study, we studied the characteristics of soil ions, nutrient and their stoichiometric ratios at different sampling points and different thermal effects. The principal component analysis and membership function were used to calculate the soil quality index (SQI) to comprehensively evaluate the impact of different thermal effects on soil quality (SQ). The results showed that soil cations were dominated by Na+ and anions by Cl− and SO42−, and the higher the temperature, the higher the concentration of SO42−. The concentrations of Na+ and Cl− tended to increase with increasing temperature, while the opposite was true for K+ and SO42−. Soil organic carbon (SOC) increased with increasing temperature, Total nitrogen (N) content was lower when heated at 40°C 5 d, and the N:P ratio was 8.99. The degree of soil degradation at this time was only lower than that at 70°C for 10 and 20 d, which indicated that the SQ was initially affected by the temperature. The analysis using principal component analysis and membership function showed that the Sikeshu (SKS) fire area (SQI = 0.183) was lower than the Wugong (WG) fire area (SQI = 0.281). In the homemade heating experiment, the SQI of the soil affected by thermal effects was lower than that of the raw soil. The SQIs were consistent at 40°C 20 d and 70°C 10 d, indicating that the effect of low temperature for a long time and high temperature for a short time on SQ can be equivalent. The results of this study provide a theoretical basis for SQ improvement and ecological restoration in coal fire areas.

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来源期刊

Land Degradation & Development 农林科学-环境科学

CiteScore

7.70

自引率

8.50%

发文量

379

审稿时长

5.5 months

期刊介绍： Land Degradation & Development is an international journal which seeks to promote rational study of the recognition, monitoring, control and rehabilitation of degradation in terrestrial environments. The journal focuses on: - what land degradation is; - what causes land degradation; - the impacts of land degradation - the scale of land degradation; - the history, current status or future trends of land degradation; - avoidance, mitigation and control of land degradation; - remedial actions to rehabilitate or restore degraded land; - sustainable land management.