西南环境移民示范区土壤肥力动态变化

Dynamic changes of soil fertility and its causes in southwest China demonstration area of environmental immigrants

为了解西南环境移民示范区农业土地利用对土壤肥力变化的影响 ,以便更好地指导移民对土地进行合理的综合性开发 ,特对肯福环境移民示范区移民迁入前和移民迁入后第三年示范区的土壤养分的动态变化进行了研究 ,分析了耕层土样的 8个土壤养分指标 ,结果表明 ,示范区土壤肥力整体上呈下降趋势 ,但不同的养分元素含量变化又有差别 ,并且不同利用方式的土壤养分元素含量变化也存在差别 ,宜林类用地土壤肥力降低幅度最大。

In order to understand the influence of land use on soil fertility changes in Kenfu demonstration area of environmental immigrants, some studies were made on soil nutrients of demonstration area. Analysis of soil samples collected in 1996 and in 1998 were also carried out. The results showed that the soil fertility level decreased compared with the that of 1996 , but the changing trends of the different indexes of soil nutrients were not absolutely similar. The changing trends of soil nutrients were also some different under different land utilization patterns. Based on these studies , the current land utilization patterns should be regulated reasonably and the benefit of land production should be also improved. At the same time, just by so doing, the soil fertility can be maintained and increased and the high efficient sustainable land use can be achieved.