基于GPS和Arc GIS技术，对武威市凉州区耕层土壤有机质的空间变异特征，以及不同土类中的平均含量分析评价，结果表明，凉州区土壤有机质平均含量为16.20 g/kg，变化区间为1.02～40.10 g/kg，标准差为5.79，有机质含量为Ⅳ级，属中等变异。相对于第二次土壤普查，有机质含量平均增加了2.10 g/kg。山地灰钙土有机质平均含量最高，为19.38 g/kg；风沙土最低，为10.54 g/kg。

This research based on GPS and Arc GIS technology then gives a analysiis of spatial variation features of arable layer soil organic matter in liangzhou district， and the average content of different soil type， the results showed that soil organic matter average content of liangzhou district was 16.20 g/kg， variation range was 1.02 ~ 40.10 g/kg， the standard deviation was 5.79， organic matter content was Ⅳ level， and belongs to the medium variation. Compared with the second soil census， The organic matter content increased by 2.10 g/kg， The average percentage of organic matter of mountain ash siol was the highest(19.38 g/kg)； Sand siol was the lowest(10.54 g/kg).

S159.2

农业部测土配方施肥试点补贴资金项目