基于亚米级遥感影像的土壤侵蚀治理成效监测评估——以福建长汀县朱溪小流域为例

Monitoring and Evaluating the Effectiveness of Soil Erosion Control Based on High Resolution Remote Image——A Case in Zhuxi Watershed,Changting County,Fujian Province

以福建长汀县朱溪小流域为示范区,选取2011年和2014年两期亚米级高分辨率遥感影像为主要数据源,辅助降雨数据、1∶1万DEM、土壤数据等开展土壤侵蚀治理成效监测评估。通过高分辨遥感影像有效提取了小流域梯田、植被覆盖度、详细土地利用分布等结果,最后利用CSLE模型对朱溪小流域土壤侵蚀变化进行了定量评价。结果表明:朱溪小流域强度到剧烈土壤侵蚀面积从2011年的4.55%减少到2014年的1.93%。其中剧烈侵蚀从占流域面积0.44%减少到2014年的0.15%。2011—2014年3年间强度以上土壤侵蚀明显减少,土壤侵蚀治理措施取得了明显成效。研究认为,亚米级高分辨率遥感影像是土壤侵蚀治理成效监测评估的有效手段。

We used GIS and RS technology,and combined with high resolution remote image of Zhuxi watershed,rainfall data obtained from hydrologic station,DEM in the scale of ten thousand and soil attribute data.The watershed terrace,vegetation coverage and land use/cover was extracted from high resolution by Fourier transform and object-oriented classification.The CSLE model was selected to make quantitative evaluation of soil erosion in Zhuxi watershed.And then,we carried out space analyses on the erosion result.It turns out that the overall proportion of intense erosion and severe erosion decreased from 4.55％ in 2011 to 1.93％ in 2014.The proportion of severe erosion decreased from 0.44％ in 2011 to 0.15％ in 2014,intense erosion and more serious situation decreased significantly during these three years,which means that the measures of soil erosion control have made the significant achievement.Then,we analyzed it from the perspective of land cover types,we found that intense erosion and severe erosion mainly occurred in the woodland,next in some woodland,which mainly focused in the no vegetation under trees.Sub-meter resolution remote sensing image is an effective means to monitor the effectiveness of soil erosion control.