耕作土壤表面不平度分析

Analysis of Tillage Soil Surface Roughness

利用激光式不平度测试仪测定犁耕耕地地面、圆盘耙耙地地面和驱动耙耙地地面的不平度 ,测定地面不平度沿着 3个方向进行 ,即平行、倾斜和垂直于耕作方向。对每一种地面不平度的 RMS高度、自相关长度和自相关函数进行了分析 ,结果表明 :对于短的地块 ,可用单一尺度来表征地表不平度的特征 ,地表不平度特征属于指数相关函数 ,RMS高度和自相关长度具有明显的相关性 ;对于长的地块 ,平整的农业地表不平度具有分形性或多尺度性 。

Roughness of agricultural soil profile has a potential relation with soil wind erosion, tire soil interaction and soil moisture mapping. By using of a laser profiler, the surface height variation trace of three types of tillage soil profiles, that is ploughed, harrowed and rolled surface, were obtained. In order to acquire the different direction profiles of every tillage type, the profiles at 0(parallel), 45 and 90 (perpendicular) degrees with respect to the tillage direction were measured. Using these data the range of root mean square (rms) height and correlation values associated with each agricultural roughness state were estimated. The results show that at spatial scales agricultural surface roughness characterization are well described by the superposition of a single scale process related to the tillage state with a multi scale random fractal process related to field topography.