工程治理不同阶段石漠化变化特征研究

Study on characteristics of rocky desertification changes in different project management stages

选择关岭花江和清镇红枫湖典型石漠化工程治理区为研究对象,利用小流域治理不同时段高分辨率遥感影像和实地样方监测手段,分析工程实施前后工程治理不同阶段治理区石漠化变化特征及年变化率差异。结果表明,经过工程治理后,两个治理区石漠化面积均减少,石漠化年变化率总体呈现出先增加后逐渐降低的趋势,一般在工程实施后第5年石漠化变化最明显。石漠化强度不同,治理成效也有一定差异,石漠化较弱的清镇治理区石漠化年变化率明显高于石漠化较强的花江治理区,说明石漠化越严重,治理成效越小,难度越大。

Taking Guanling Huajiang and Qingzhen Hongfenghu typical rocky desertification control project areas as research object, using different periods of high resolution remote sensing images and field plot monitoring means, this paper analysed rocky desertification area variation and annual variation rate in different stages of project governance. Results showed that rocky desertification area in two research areas decreased after project governance, annual change rate increased first and then decreased gradually, rocky desertification changed most obvious generally in 5 years after implementation of the project. Effect of governance also had certain difference because different rocky desertification intensity, annual change rate of rocky desertification in Qingzhen was significantly higher than that in Huajiang area which rocky desertification was more serious, indicating that the more serious rocky desertification was, the cess governance effected, the more difficulty control engineering was.