Fang Haiyan, Zhai Yuyu, Li Chaoyue
Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China.
Sci Rep. 2024 Jul 7;14(1):15629. doi: 10.1038/s41598-024-65646-5.
The impact of soil erosion on soil quality is still not systematically understood. The purpose of this study was thus to quantify the impact of soil erosion on soil quality and its change with slope morphology in an agricultural field, northeastern China based on radionuclide Cs, unmanned aerial vehicle derived high resolution digital elevation model, and soil sampling. Cs method yielded an average soil erosion rate of - 275 t km yr ranging from - 1870 to 1557 t km yr. The soil quality index derived from total dataset (SQI_TDS) can be well explained by that derived from minimum data set (SQI_MDS) with a determination coefficient R of 0.874. SOM, sand, and cation exchange capacity in the MDS play more important roles than other soil indicators. Soil quality was significantly affected by soil erosion, with Adj. R of 0.29 and 0.33 for SQI_TDS and SQI_MDS, respectively. The spatial variations of soil erosion and soil quality were both affected by slope topography. Soil erosion must be controlled according to topographic and erosion characteristics in northeastern China.
土壤侵蚀对土壤质量的影响仍未得到系统的认识。因此，本研究的目的是基于放射性核素铯、无人机获取的高分辨率数字高程模型和土壤采样，量化中国东北某农田土壤侵蚀对土壤质量的影响及其随坡形的变化。铯法得出的平均土壤侵蚀速率为-275吨/平方公里·年，范围在-1870至1557吨/平方公里·年之间。由总数据集得出的土壤质量指数（SQI_TDS）可以很好地由最小数据集得出的土壤质量指数（SQI_MDS）解释，决定系数R为0.874。最小数据集中的土壤有机质、砂粒和阳离子交换容量比其他土壤指标发挥更重要的作用。土壤侵蚀对土壤质量有显著影响，土壤质量指数总数据集（SQI_TDS）和最小数据集（SQI_MDS）的调整R分别为0.29和0.33。土壤侵蚀和土壤质量的空间变化均受坡形地形影响。在中国东北，必须根据地形和侵蚀特征控制土壤侵蚀。
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