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| Characteristics of soil aggregates in the Shanxi-Shaanxi-Inner Monglia opencast coal dump, China |
| Received:May 19, 2020 |
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| KeyWord:water-stable aggregates;mean weight diameter;geometric mean weight diameter;fractal dimension;soil organic matter content |
| Author Name | Affiliation | E-mail | | LIU Hong-tao | College of Resources and Environment, Northwest A&F University, Yangling 712100, China | | | ZHENG Ji-yong | College of Resources and Environment, Northwest A&F University, Yangling 712100, China
State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Water and Soil Conservation, Chinese Academy of Sciences & Ministry of Water Resources, Yangling 712100, China | zhjy@ms.iswc.ac.cn | | LI Gao-liang | State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Institute of Water and Soil Conservation, Chinese Academy of Sciences & Ministry of Water Resources, Yangling 712100, China | | | MA Zhang-huai | College of Resources and Environment, Northwest A&F University, Yangling 712100, China | | | YANG Kai-qi | College of Resources and Environment, Northwest A&F University, Yangling 712100, China | |
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| Abstract: |
| In order to explore how the characteristics of new soil aggregates are affected by weathered coal and soft rock, four new soil masses were established in the Shanxi-Shaanxi-Inner Monglia mining area:sandy loess, sandy loess mixed with soft rock, sandy loess mixed with weathered coal, and sandy loess mixed with soft rock and weathered coal. After 4 years, the composition of soil aggregates was measured by dry and wet sieve methods, and analyzed the aggregate composition and stability of the new soil mass. Results showed that soft rock and weathered coal mixed with the sand could increase the content of < 0.25 mm air-dried stable aggregates. This combination also increased the mean weight diameter and geometric mean weight diameter, but decreased the fractal dimension to 0.843, 0.751 mm, and 2.803, respectively. In addition, organic matter content and water-stable aggregate percentage of this combination were the largest, reaching 21.45 g·kg-1 and 60.41%, respectively. In addition, it also had the lowest aggregate damage rate of 30.85%. Correlation analysis showed that mixing weathered coal and soft sandstone with the sand increased the organic matter content, improved the soil structure, and strengthened the aggregate. However, mixing weathered coal with the sand increased the compound grain content but decreased the stability of soil. The study illustrates the effects of new soil aggregates on weathering coal and soft sandstone, and brings positive significance to soil texture restoration, and soil and water conservation. |
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