皖东江淮丘陵县域农田土壤有机质空间变异特征

Spatial variability characteristics of soil organic matter at county scale of Jianghuai hilly region in the east Anhui province

基于皖东江淮丘陵滁州市7个县域农田土壤有机质数据,运用传统统计学和地统计学方法,分析了皖东江淮丘陵县域农田土壤有机质的空间变异特征。研究结果表明,滁州市各县域农田土壤有机质平均含量介于15.16~19.90 g·kg-1之间,土壤有机质含量总体水平较低。变异系数为11.0%~22.4%,均为中等程度变异。但不同县域农田土壤有机质的空间自相关程度和结构性影响因子存在差异。空间自相关程度方面,南谯、来安、明光、凤阳和全椒5个县域为强烈空间自相关,而定远和天长两个县域为中等空间自相关。结构性影响因子方面,南谯、全椒和明光3个县域主要受土壤质地影响,而定远、凤阳、来安和天长4个县域主要受土壤类型影响。皖东江淮丘陵各县域应结合其土壤有机质空间变异特点对土壤资源进行合理利用与保护,以提高土壤有机质含量,改善土壤质量。

The spatial variability characteristics of soil organic matter at county scale in Jianghuai hilly region of east Anhui Province was analyzed by using traditional statistical and geostatistical methods based on the soil organic matter data of seven counties in Chuzhou city.The results showed that the average content of soil organic matter in counties of Chuzhou ranged from 15.16 to 19.90 g·kg-1,and the overall level of soil organic matter was low.The coefficient of variation was 11.0% ~ 22.4%,which was moderate.However,spatial autocorrelation degree and structural factors of soil organic matter in different counties were different.In terms of spatial autocorrelation degree,the five counties of Nanqiao,Laian,Mingguang,Fengyang and Quanjiao were strongly spatial autocorrelated,while the two counties of Dingyuan and Tianchang were medium spatial autocorrelated.In terms of structural factors,the three counties of Nanqiao,Quanjiao and Mingguang were mainly affected by soil texture,while the four counties of Dingyuan,Fengyang,Laian and Tianchang were mainly affected by soil types.Therefore,the soil resources of each county in Jianghuai hilly area of east Anhui should be rational used and protected in order to improve the content of soil organic matter and soil quality.