排灌机械工程学报2017，Vol.35Issue(5)：424-429,6.DOI:10.3969/j.issn.1674-8530.16.0236
南方农田土壤容重空间变异性及其尺度效应
Spatial variability and scale effect of soil bulk density of farm land in South China
摘要
Abstract
Taking a typical farm land in South China as the test field,the spatial variability and scale effect of bulk density of soils harvested at different soil depths (0-10,10-20 cm) in the selected field were analyzed by using classical statistical and geostatistical methods,and the spatial interpolation of soil bulk density in the field was estimated.The results indicated that the coefficient of variation (CV) of bulk density was small and the variation was weak.A semi-variogram analysis showed that the C0/(C0+C) values of the measured soil bulk density were lower than 10%,indicating the spatial hete-rogeneity resulted from the spatial variability of soil bulk density was significant.For the scale effect,the CV decreased firstly and then increased with increasing sampling interval.By adjusting the location of sampling points ("re-sampling"),it was found that the CV of soil bulk density was small (6.32%-7.92%) and the correlation distance decreased when the sampling interval increased.It was suggested that the sampling interval affected CV a little after the interval was decreased to a certain value.The spatial distribution pattern of soil bulk density in two layers also showed a spatial correlation based on the density spatial interpolation and contours,i.e.a significant positive correlation with a correlation coefficient of 0.76.Furthermore,the spatial variability of soil bulk density was affected by human activities largely.关键词
土壤容重/空间变异/尺度效应/经典统计/地统计学方法Key words
soil bulk density/spatial variability/scale effect/classical statistical/geostatistical method分类
农业科技引用本文复制引用
徐翠兰,侯淑楠,姚紫东,张飞,佘冬立..南方农田土壤容重空间变异性及其尺度效应[J].排灌机械工程学报,2017,35(5):424-429,6.基金项目
国家自然科学基金资助项目(41471180) （41471180）
江苏省国土资源科技项目(KJXM2016003) （KJXM2016003）
