摘要
对10 m×10 m面积内的100个土壤样点取样分析其硝态氮含量,用地质统计学中的区域化变量理论和半方差函数分析,研究结果表明2种含水率土壤中硝态氮含量在一定范围内均具有空间变异性,属于中等程度变异;硝态氮含量的半方差随着取样间距的增加而增加,最后趋于稳定,存在着空间变异结构,对其进行拟合,确定其变异程度及空间相关尺度。
One hundred soil samplers at a plot of 10 m×10 m were made at an interval of 1 m with different soil moisture and different time. The NO3^--N in surface soil （10 to 15 cm） were measured. The author analyzed experimental data by the theory of regionalized variable theory and studied the spatial variations of NO3^--N in the field. The results showed that the NO3^--N at different soil moisture had spatial variability in a given spatial range. The semi-variances of NO3^--N were increased with the increase of the lag（h）. Fitting the results with linear regressions, the parameters of the semi-variograms were estimated, and their variable extent and space correlative scale were made.
出处
《灌溉排水学报》
CSCD
北大核心
2008年第3期106-108,共3页
Journal of Irrigation and Drainage
关键词
硝态氮
空间变异
区域化变量
半方差分析
NO3^--N
spatial variability
regionalized variable theory
semi-variance analysis
