西南岩溶盆地土壤干容重协同克里格分析

选择我国云南典型的坝子农业区鹤庆盆地为研究区域,用环刀采集表层(0~10 cm)土壤样品114个,测定土壤干容重和土壤含水率。利用经典统计学方法、普通克里格(OK)方法和协同克里格(OCK)方法,研究坝子农业土壤干容重的空间变异特征。结果表明:研究区域土壤干容重变化范围为0.74~1.60 g/cm3,平均值为1.25 g/cm3。在空间分布上研究区域土壤干容重呈现南北低,中东部高的格局,土壤类型、质地和土地利用方式是影响其空间分布的主要因素。土壤干容重和土壤含水率具有显著的相关性,相关系数达到-0.686。Kriging插值分析表明,以土壤含水率为辅助数据,利用OCK法能有效提高土壤干容重的预测精度。

Cokriging Analysis on Soil Bulk Density in Karst Basin of Southwest China

Heqing basin is a typical dam agriculture area in Yunnan province in Southwest China, which was selected as the study area. 114 soil samples (0~10cm) were collected in metal cylinders (diameter 5cm; length 5cm), and soil bulk density (SBD) and soil water content (SWC) were measured gravimetrically. The classical statistical analysis methods of ordinary Kriging (OK) and ordinary Cokriging (OCK) were used to study the spatial variability of soil bulk density. Results showed that the values of soil bulk density ranged from 0.74g/cm3 to 1.60g/cm3, with an average of 1.25g/cm3. The low value of soil bulk density distributed in north and south regions in the study area, while the high value distributed in mid-east region, which were influenced by soil type, texture and land use in the dam area. Soil bulk density was highly correlated with soil water content and the correlation coefficient between them was -0.686. The spatial variability of soil bulk density was studied using OCK method with soil water content as auxiliary variable, and the prediction accuracy was enhanced by 36.61%.