基于普通克里格的中山市农田土壤砷的空间变异特性

Spatial Variation Characteristics of Arsenic in Farmland Soil Based on Ordinary Kriging in Zhongshan City

采集了中山市58个农田土壤样品,分析了重金属砷的浓度值,通过模拟地统计学半变异函数模型得到最佳模拟效果并绘制了砷的普通格里格插值图。结果显示:半方差函数表明砷的空间异质性为中等强度等级,空间自相关性尺度较小,砷的富集受土壤内在属性以及人为因素共同作用;砷的分布特征呈东高西低、南高北低的态势,大致表明农业生产对砷的富集影响高于工业生产,砷可能主要来源于施肥及含砷农药的使用等。

58 farmland soil samples were collected,concentration of the heavy metals arsenic were analyzed,and a interpolation figure of arsenic based on Ordinary Kriging was drawn after the best geostatistical semivariable function mode was found.The results show that the spatial heterogeneity of arsenic is medium intensity level which is influenced by the semivariable function,the spatial autocorrelation scale is small,and affected by the intrinsic properties of soil and human factors;and,distribution characteristics of arsenic presents higher in the east than the west and south than north,generally indicates that agricultural production for arsenic enrichment effect higher than that of industrial production,arsenic may mainly comes from the use of fertilizer and pesticide arsenic,etc.