Yang Qi-Yong, Yang Jing-Song, Liu Guang-Ming
Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Ying Yong Sheng Tai Xue Bao. 2011 Feb;22(2):431-6.
With the support of GIS and by using classical statistics and geostatistics methods, the spatial variability of soil available P (AP) and available K (AK) in cultivated lands in Yucheng City of Shandong Province was approached at county and township scales. The results showed that both the soil AP and AK followed the logarithmic normal distribution, with the coefficient of variation (CV) at the two scales being 26.5% - 36.6% and presenting a moderate variation. With the decrease of the scale, the CV of the soil AP and AK increased. Both the soil AP and AK were spatially correlated with scale. At county scale, the soil AP and AK had a larger spatial correlation distance, being 9.0 km and 26.5 km, respectively; while at township scale, the soil AP and AK had a smaller spatial correlation distance, being 1.7 km and 2.8 km, respectively. The spatial distribution of the soil AP and AK at the two scales was obviously different, which was mainly affected by structural factors and random factors.
在地理信息系统（GIS）支持下，运用经典统计学和地统计学方法，在山东省禹城市县级和乡镇级尺度上探讨了耕地土壤有效磷（AP）和速效钾（AK）的空间变异性。结果表明，土壤AP和AK均呈对数正态分布，两个尺度上的变异系数（CV）为26.5% - 36.6%，呈现中等变异程度。随着尺度减小，土壤AP和AK的CV增大。土壤AP和AK在空间上均与尺度相关。在县级尺度上，土壤AP和AK具有较大的空间相关距离，分别为9.0 km和26.5 km；而在乡镇级尺度上，土壤AP和AK的空间相关距离较小，分别为1.7 km和2.8 km。两个尺度上土壤AP和AK的空间分布明显不同，主要受结构因素和随机因素影响。
