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探究地形变化对耕地土壤侵蚀空间分布聚集性的影响,为耕地合理利用及水土保持工作提供参考。利用修正的通用土壤流失方程(RUSLE)对耕地土壤侵蚀量进行空间估算,并以行政村为单元对耕地的土壤侵蚀强度指数进行空间自相关分析,揭示土壤侵蚀强度的局部聚集特征;选取高程、高程变异系数、坡度、坡度变率4种地形因子,对耕地土壤侵蚀强度指数在0.05显著性水平下的局部聚集区域的地形特征进行分析。结果表明:耕地土壤侵蚀强度指数在行政村之间存在较强的空间自相关性;空间分布特征为,显著高值聚集区(HH聚集区)主要分布在青龙满族自治县的中南、东北和西部,显著低值聚集区(LL聚集区)分布在该县的中北部地区,聚集区的形成均与地形的分布关系密切;HH聚集区在高程、高程变异系数、坡度这3项指标的面积分布上均比LL聚集区高出一个分级梯度。研究结果对耕地合理利用及水土保持措施的制定具有重要意义。
Explored the impact of topographic changes on the spatial distribution and accumulation of soil erosion in cultivated land and provided reference for the rational utilization of cultivated land and soil and water conservation. Spatial autocorrelation analysis of the soil erosion intensity index of arable land based on the unit of administrative village was conducted using the modified universal soil loss equation (RUSLE) to reveal the local aggregation characteristics of soil erosion intensity. According to the elevation, Topographical variation coefficient, slope degree and slope change rate, the topographic characteristics of the local aggregation area under the 0.05 significance level of soil erosion intensity index were analyzed. The results showed that there was strong spatial autocorrelation among the administrative villages in the index of soil erosion intensity of the cultivated land. The spatial distribution was characterized by significant high value gathering area (HH gathering area) mainly distributed in the south, northeast and west of Qinglong Manchu Autonomous County, Significantly low concentration areas (LL aggregates) were found in the central and northern regions of the county, and the formation of aggregation areas was closely related to the topography distribution. The distribution of HH aggregates in the area distribution of elevation, elevation coefficient of variation and slope All of them have a grading gradient higher than LL agglomeration. The research results are of great significance to the rational utilization of cultivated land and the formulation of soil and water conservation measures.