伽师县种植作物土壤有机质与盐分的相关性分析

为提高伽师县不同耕作土壤施肥的精度、减少浪费、降低盐分含量及轮流种植作物等方面提供科学依据。采用野外取样、GPS定位、统计分析和空间分析方法，在SPSS 17.0 和ArcGIS 9＋的支持下，研究不同耕作土壤有机质与盐分之间进行相关性分析。研究结果表明：（1）种植甜瓜土壤各层有机质平均含量高于种植玉米和种植棉花土壤。（2）不同耕作土壤不同土层中各盐离子变异系数的差异比较明显，有机质与盐离子具有不同程度的相关特征。其中，种棉土壤中有机质与K+＋Na+、Mg2+盐离子呈显著正相关，其余都是呈显著负相关；种植甜瓜土壤有机质与Cl-、Mg2+盐离子呈显著正相关，其余都是呈显著负相关；种植玉米土壤中有机质与SO42-、K+＋Na+、Mg2+盐离子呈显著正相关，其余都是呈显著负相关。（3）种植棉花土壤的盐分含量从表层到底层呈逐渐增加趋势；种植甜瓜土壤的盐分含量分别为表层含量高，中层和底层的盐分含量差异不大；种植玉米土壤的盐分含量呈先增加后减少的趋势。

Correlation Analysis Between Organic Matter and Salinity in Cultivated Soil of Jiashi County

The purposes are to provide a basis for precise fertilization, waste reduction, salt content decrease in soil and crop rotation. The field samples, GPS positions, statistical analysis and space analysis methods were used in this study. Correlation analysis between organic matter and salinity in cultivated soil was studied based on the SPSS17.0 and ArcGIS 9+ software. The results showed that: (1) the average content of organic matters in melon planting soil was higher than that in maize and cotton planting soil; (2) the differences of variation coefficients in different layers of different cultivated soil were obvious, the organic matters and salt ions had different degrees of correlated characters, the organic matter and K++ Na+, Mg2+ salt ions showed significantly positive correlations in cotton planting soil, and the others had significantly negative correlations; the organic matters and CI-, Mg2+ salt ions had significantly positive correlations in melon planting soil, and the others had significantly negative correlations; the organic matters and SO42-, K++ Na+, Mg2+ salt ions showed significantly positive correlations in maize planting soil, and the others showed significantly negative correlations; (3) the content of salt in cotton planting soil gradually increased from surface to bottom; the content of salt in the surface layer of melon planting soil was high, while the contents of salt in the middle and bottom layers had no difference, the content of salt in maize planting soil had first increasing and then decreasing trend.