江门市新会区耕地土壤有效性Si,Ca,Mg的空间变异特征  

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

作　　者：彭凌云[1] 甘海华[1] 吴靖宇[1] 

机构地区：[1]华南农业大学资源环境学院,广东广州510642

出　　处：《水土保持学报》2005年第2期80-83,共4页Journal of Soil and Water Conservation

基　　金：国家自然科学基金重点项目 (40 2 350 54);广东省科技项目 (2 0 0 4B3330 1 0 1 2 )资助

摘　　要：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% 。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.

关 键 词：土壤有效性 空间变异特征 新会区 江门市 CA SI Mg KRIGING插值 研究区域 东北部地区 空间分布特征 耕地面积 GIS技术 半方差分析 空间相关性 地统计学 元素含量 正态分布 对数转换 部分地区 硅含量 中部 

分 类 号：S144[农业科学—肥料学] X53[农业科学—农业基础科学]