基于地统计学的黄土高原地貌分异规律研究

Research on the Topographic Differentiation Rule of the Loess Plateau Based on Geostatistics

地统计分析是研究区域化变量的重要手段,以陕北黄土高原为研究区域,采用数字地形分析结合地统计学的方法进行地形空间分异规律研究。选取神木、绥德、延川、甘泉、宜君、长武、淳化7个样区,从变程、偏基台值、块金值3个指标,分析了黄土高原地区高程、坡度、剖面曲率和平面曲率在空间上的分异规律。结果表明,高程的块金值变化与地形粗糙度存在正相关关系,坡度的变程变化与粗糙度呈负相关关系,剖面曲率的块金值变化与粗糙度一致。黄土高原整体地形由南至北呈平缓—破碎—平缓的变化特点。

Geostatistical analysis is an important method of studying the regionalized variables.In this paper,taking the Loess Plateau in northern Shaanxi as the research area,we used the method that combining the digital terrain analysis with the geostatistical analysis to research the spatial differentiation rules of terrain.We selected seven sample areas including Shenmu,Suide,Yanchuan,Ganquan,Yijun,Changwu,Chunhua,and analyzed the spatial differentiation rules of elevation,slope,profile curvature and surface curvature in the Loess Plateau from the range value,the partial sill and the nugget value.The results show that the nugget value change of the elevation positive correlates with terrain roughness,the range change of the slope is negatively related to the roughness,and the nugget value change of the profile curvature is consistent with roughness.The terrain of the Loess Plateau from south to north is gently-broken-gently.