江门市新会区耕地土壤有效性Si,Ca,Mg的空间变异特征

运用地统计学,结合GIS技术研究了江门市新会区土壤有效性Si、有效性Ca和有效性Mg3种元素含量的空间分布特征。结果表明,各变量经对数转换后符合正态分布。半方差分析的结果显示,除了有效性Ca具有强空间相关外,其余的都具有中等空间相关性。从Kriging插值结果可知,有效性硅含量在115 2 30mg/kg的面积占研究区域耕地面积的34.9% ,主要分布于研究区域的中部和东北部地区;有效性Ca的含量在>10 0 0mg/kg的面积占研究区域耕地面积的71.6 % ,主要分布在研究区域的东北、中部和西北、南部的部分地区;有效性Mg的含量在>30 0mg/kg的面积占研究区域耕地面积的2 9.8% ,主要分布于研究区域的东北部地区

Spatial Variability of Soil Available Silicon, Calcium and Magnesium in Cultivated Soil of Xinhui District, Jiangmen City

Geostatistical methods were used in combination of GIS techlonogy to analyze the spatial distribution characteristics of available silicon, available calcium and available magnesium in cultivated soil in Xinhui district, Jiangmen. The results indicated that data of each variable fitted normal distribution after log transformation. Semivariogram analysis showed that 3 soil elements were moderately spatially dependent in a given spatial range and available calcium were strongly spatially dependent. With the Kriging analysis, results showed that the area with the content of available silicon in the range of 115~230 mg/kg is 34.9% of the investigation region, mainly distributed in the middle and the northeast. The area with the content of available calcium in the range of >1 000 mg/kg is 71.6% of the investigation region, mainly distributed in the northeast, middle, northwest and the south. The area with the content of available magnesium in the range of >300 mg/kg is 29.8% of the investigative region, mainly distributed in the northeast.