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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 ,其自相关函数是一种分形过程
Unevenness tester laser rodents plowing cultivated land, rake rake to the ground and the rake rake ground roughness, ground roughness measured in three directions, that is, parallel, inclined and perpendicular to the farming direction. The RMS height, autocorrelation length and autocorrelation function of each ground roughness are analyzed. The results show that for a short block, the characteristics of surface roughness can be characterized by a single scale, and the characteristics of surface roughness belong to the exponential correlation function , RMS height and autocorrelation length have significant correlations; For long plots, the formation of agricultural surface roughness has fractal or multi-scale, the autocorrelation function is a fractal process