为研究县域尺度土壤调查最适宜的采样尺度和插值方法,以河北省顺平县山前平原区为例,按照8点/km2点位密度采集1532个土壤样品并测定土壤有机质.从样点中抽取250 m × 250 m、500 m× 500 m、1 km× 1 km、2 km × 2 km 4个采样尺度样本子集,结合地统计学和GIS对有机质空间变异特征进行分析,并对不同采样尺度和插值方法下有机质含量空间插值结果进行分析比较.结果表明:研究区有机质含量具有中等变异性,普通克里金法插值精度优于规则样条函数法和反距离权重法.为保证研究区有机质空间变异评价精度,较为适宜的采样尺度为1 km× 1 km.
Research on the Prediction Accuracy of Soil Organic Matter in Cultivated Land in the Plain Area of Shunping County Based on Sampling Scale and Spatial Interpolation Method
To study the most suitable sampling scale and interpolation method for county-level soil investigation,taking the piedmont plain area of Shunping County,Hebei Province as an example,1532 soil samples were col-lected at a density of 8 points/km2 and soil organic matter was measured.4 sampling scale sample subsets(250 m ×250 m,500 m×500 m,1 km× 1 km and 2 km×2 km)are extracted from sample points.The spatial variation characteristics of organic matter using geostatistics and GIS are analyzed,and the spatial interpolation results of organic matter content under different sampling scales and interpolation methods are compared.The research re-sults indicate that the organic matter in the study area exhibits moderate spatial variability,and the interpolation accuracy of the ordinary Kriging method is better than that of the regular spline function method and the inverse distance weighting method.To ensure the accuracy of organic matter spatial variation evaluation in the research area,the more suitable sampling scale is 1 km×1 km.
NETL
NSTL
万方数据
