小流域综合治理对水土流失强度的影响研究

Study on the Effect of Comprehensive Management of Small Watershed on Soil Erosion Intensity

小流域综合治理工程是目前区域水土流失治理中应用较为广泛和相对成熟的一种技术,为研究其对水土流失强度变化的影响,基于eCognition、ArcGIS软件和治理前后的两期遥感影像,对尖山河小流域北部水土流失变化情况进行了研究。结果表明:2002—2006年尖山河小流域北部土壤侵蚀整体呈现由强变弱的趋势,实施水土保持小流域综合治理工程前,强度侵蚀以上的面积占土地总面积的46.89%,而在治理后,这一比例降为31.03%;治理后中度以上侵蚀面积均比治理前有不同程度的减少,而微度侵蚀面积显著增加。因此,小流域综合治理工程取得了显著效果。

Comprehensive management of small watershed is a kind of relatively mature technology which was extensively applied to regional soil erosion governance.In order to investigate its effect on the change of soil erosion intensity,based on eCognition,ArcGIS and two period remote sensing images of pre-and post-governance,the change of soil loss in the north of Jianshanhe valley was studied.The results indicated that soil loss showed a strong to weak trend between 2002 to 2006 in the north of Jianshanhe valley,before implementing comprehensive management of small watershed,the erosion intensity over serious erosion occupied 46.89% of the total land area,after implementing,the proportion decreased to 31.03%,moreover,the area of erosion intensity over middle intensity erosion has decreased with different degree,however,micro-degree erosion area significantly increased.So,comprehensive management of small watershed has achieved the significant effect.