典型潮土区土壤耕层盐分含量的趋势效应研究

通过分析典型潮土区山东省禹城市100个土壤采样点2003年耕层土壤的盐分含量,研究得出了潮土区土壤耕层盐分含量的空间分布图,在地统计学和地理信息系统的支持下,分析了区域尺度土壤耕层含盐量的趋势效应,探讨了研究区土壤盐分含量的空间变异性特征。在对比分析研究区2003年和1980年第二次土壤普查土壤耕层盐分含量的空间变异性基础上,基于研究区近50年的气温和降水资料,分析了研究区盐分含量变化的原因,并总结了引起研究区土壤盐碱化的人为原因。

The Trend Variability of Soil Salt Content in the Representative Fluvo-aquic Soil Area

By means of analyzing salt content of 100 soil sampling points of Yucheng city where locates in the representative Fluvo-aquic soil area in Shandong province in 2003 ,the article studied the temporal and spatial variability of salt content by coupling geostatistics theory with geographic information system, also analyzed the trend variability of soil salt content on the region scale in soil arable layer. With the help of the temperature and precipitation within 50 years, the article also analyzed the change cause of soil salt content in the research area, and the decrease of salt content provided good conditions for the increase of SOM content and effective nutrient content. The research results showed that soil salt content characteristic is normal distribution(after log transformation),the semivariogram model of soil salt content is fitted with spherical model, the nugget/sill ratio, soil salt content had exhibited middle spatial correlation ,which results from structure and stochastic factor together.