黄土高原土壤侵蚀监测与预估──以长武沟壑区为例

Development and prediction of soil erosion in loess plateau ──taking the gully area in Changwu county as example

应用不同时期的ＴＭ图像，分别解译编制两期土壤侵蚀类型图。在地理信息系统（ＧＩＳ）支持下，建立空间数据库。获得长武县土壤侵蚀动态图和动态转移数据矩阵，可以定位、定性、定量地显示前后两期间土壤侵蚀动态演变格局，并用Ｍａｒｋｏｖ链模型对未来土壤侵蚀演变趋势进行模拟和预测。结果表明，研究区同时存在着＂一边治理，一边破坏＂的双重现象。

TM pictures of different perirods were used to explain and work out 2 type diagram of soil erosion; and under the support of the GIS, a space data base, a soil erosion development graph and a data matrix of the soil erosion development transformation were established so as to positionally,quantitatively and qualtatively display the soil erosion development pattern from the early stage to the late stage. And with the Markov Chain Model the future tendency of soil erosion development can be simulated and predicted. The results show that there exists dual srtuation of controlling and destroying at the same time in Changwu County, and the soil erosion is tending to be worse.