江苏北部县域土壤有机质空间变异特征

Spatial Variation Characteristic of Soil Organic Matter in a County of North Jiangsu Province

苏北地区是江苏省的粮食主产区,掌握该地区的土壤有机质空间变异特征对苏北乃至全省农业生产均有重要意义。以江苏省沛县为案例,利用网格法采集了324个土壤样品,通过经典统计和地统计方法研究了该县的土壤有机质空间分布特征。结果表明:该县土壤有机质含量均值为20.10g/kg,变异系数为0.42,属中等变异程度;土壤有机质空间自相关性为中等程度,自相关距离为26 700m;全县土壤有机质含量主要集中在12～18,18～24g/kg和24～30g/kg三个等级,且在空间上由东向西逐渐降低,分布规律明显,主要受土壤类型与土地利用方式的空间分布的影响,并分析了该县不同区域土壤有机质含量的提升潜力,为该县乃至苏北地区制定合理的农业管理措施提供参考。

North Jiangsu is a major grain production area in Jiangsu Province. Understanding the regional spatial variation characteristic of soil organic matter is important for agricultural production of Jiangsu Province. Taking Peixian County as the study area, the spatial variability of soil organic matter on the basis of 324 soil samples collected through the county was investigated. The results showed that： the mean value of soil or- ganic matter content was 20.10 g/kg, and the corresponding variation coefficient was 0.42, belonging to me- dium level of variability. The auto-correlation distance of soil organic matter was 26 700 m. Moreover, soil organic matter contents were mainly concentrated in the three levels of 12~18, 18~24 and 24~30 g/kg and decreased regularly from east to west, closely relating to the distribution of soil types and land use patterns. It is indicated that the different region has different promotion potential of soil organic matter. It will provide reference for making agricultural management measures to Peixian County, even whole north Jiangsu.