潮土区土壤有机质含量的趋势演变研究——以禹城市为例

通过分析山东省禹城市100个采样点1980年和2003年耕层土壤的有机质含量,研究了土壤有机质的时空变异特征,探讨了潮土区有机质含量的变化,形成了研究区1980年和2003年有机质含量空间分布图及1980~2003年有机质含量的空间变化图。分析了研究区有机质含量增加的原因。研究结果表明,该市目前土壤有机质含量平均为14.68g kg-1,比1980年的6.0g kg-1增加了8.68 g kg-1,年均提高0.38g kg-1。土壤表层含盐量的降低为土壤养分含量提高提供了条件。

The Trend Variability of Soil Organic Matter Content in the Salinity Region of Yucheng City in Shandong Province

With the help of GPS(Global Position System) and GIS(Geographic Information System),the dynamic variability of soil organic matter(SOM) content was studied in 1980 and 2003 in Yucheng City in Shandong Province of China.One hundred sampling points were selected.Research result indicated the average SOM content in the arable layer was 14.68g kg~(-1) in 2003,an increase of 141.7% compared with that(6.0g kg~(-1)) recorded in 1980.The temporal and spatial variability of SOM content could be expressed by the spherical semi-variance model and ordinary Kriging interpolated method.The article also analysed the change of SOM content in the salinity region.The decrease of salinity content provided good conditions for the increase of SOM content.The research result showed that soil organic matter character is in normal distribution,the SOM had exhibited moderate spatial correlation.