辽宁瓦房店北部5乡镇土壤质量变异研究

Study on Variation of Soil Quality in Five Towns of the Northern Part of Wafangdian, Liaoning Province

运用地统计学,结合GIS分析了辽宁瓦房店北部5乡镇土壤表层(0￣20 cm)有机质、碱解氮、速效磷、及速效钾的空间变异规律及其驱动机制。通过对瓦房店北部5乡镇209个采样点养分含量及其半方差分析和Kriging插值的研究结果表明:该地区有机质均值为8.9358 g/kg,碱解氮均值为65.6744mg/kg,速效磷均值为52.3676 mg/kg,速效钾均值为58.4863 mg/kg。与第二次土壤普查资料相比,有机质含量略有下降,速效磷含量上升非常多,速效钾含量也略有上升。变异系数大小依次为速效磷、速效钾、碱解氮、有机质,分别为53.04%、42.52%、42.32%、29.24%,都属于中等变异。半方差分析的结果表明,瓦房店北部地区土壤养分各采样点的相关系数都在0.25￣0.75之间,空间相关性中等。人类的施肥习惯、耕作措施的改变及土地利用变化是引起土壤养分变化的主要原因。

The paper is concerned with the rule AK in surface soil （0-20 cm） in five northern part of Wafangdian, Liaoning nutrient content of 209 sampling points of spatial variation of four indicators--- SOM,AN, AP, and towns （Wanjialing, Xutun, Tucheng, Liguan and Songshuling） of the Province, based on the method of GIS and Geo-statistics. Using the with Semi-variance analysis and Kriging interpolation in the northern region, the study＇s result showed that the mean of SOM is 8.9358 g/kg, the mean of AN is 65.6744 mg/kg, the mean of SOM is 52.3576 mg/kg, and the mean of SOM is 58.4863 mg/kg. Comparing with the dates of Second Soil General Survey, SOM content has dropped slightly, but AP rises extremely, meanwhile, AK rises slightly. The coefficient of variation is as follows. AP, AK, AN, SOM, whose value is 53.04%,42.52%,42.32%, 29.24% respectively ,and all belong to the medium variation. The result of Semi-variogram analysis showed that the correlation coefficient of the sampling points of the five towns （Wanjialing, Xutun, Tucheng, Liguan and Songshuling） in the northern part of Wafangdian is among 0.25-0.75,and the spatial correlation presents middle. It is the main reason of the change of soil nutrients that human fertilization, measures changes in farming and land use change.