1979～1999年辽宁省耕地土壤养分肥力的变化分析

The Changes of Nutrients on the Cultivated Soils in Liaoning Province in1979～1999

1979年土壤普查结束后 ,沈阳、锦州、朝阳等地又在耕地土壤上采集5551个监测土样 ,进行了土壤有机质、全氮、速效磷、速效钾等项目的测试分析。结果表明 ,在1979～1999年 ,全省耕地土壤有机质、全氮、速效钾呈下降趋势 ,速效磷呈上升趋势。有机质年递减率约为0.06%,全氮年递减率为0.47%;有效钾年递减率约为1.27%,平均下降20.6mg·kg-1 ;有效磷年递增率约为5.31%,平均提高7.3mg·kg-1。

After the soil investigation in1979,soil OM,total N,available P,available K of the soil samplings were measurd from some areas in Liaoning province.The result showed that,in20years,the levels of soil OM,total N,total K were decreasing,but available P was increasing.The OM content decreased by0.06%annually,total N decreased by0.47%,available K decreased by1.27%,with an average decline of20.6mg·kg -1 .The available P content increased by5.31%annually,with an average increase of7.3mg·kg -1 .