黄土坡耕地地表微地形空间变异性研究

Spatial variability of micro-topography in the loess slope land

以黄土高原普遍采用的人工锄耕、人工掏挖和等高耕作等管理措施的坡耕地为研究对象,利用半方差方法分析了不同耕作措施下坡面相对高程空间变异结构特征,以期为开展数值模拟坡面微地形的研究提供理论支持。结果表明:不同耕作措施下坡面相对高程具有较强的空间相关性,依次为等高耕作<人工掏挖<人工锄耕;人工锄耕与人工掏挖坡面具有自相似性特征,等高耕作坡面,在平行坡面方向上具有自相似特征,在垂直坡面方向上具有自仿射性特征;利用球状理论模型能够较好地模拟坡耕地微地形空间分布特征。

The semi-variance methodology is applied to analyze the spatial variability characteristics of field surface relative elevation（SRE） under different types of tillage measures like artificial hoeing,contour tillage and artificial digging in loess slope land.The results indicated that：（1） The degree of spatial correlation of different types of tillage practice was contour tillageartificial diggingartificial hoeing.（2） Soil surface microrelief had the self-similar features to the slope with hoeing and that with digging in the aspects of different directions,while to the slope with contour tillage,it had self-similar features in the parallel to slope and had self-affine features in the vertical to slope,and spherical interpolation model could be used to simulate the spitial distribution features of micro-topography in the loess slope land.