摘要
茂县是岷江流域干旱河谷分布的典型地区,水土流失严重,裸土区域分布广,通过遥感及地理信息技术对茂县主要干旱河谷区域2000年以来的裸土分布时空变化进行分析,应用裸土指数提取法统计该区域地表裸土的时空变化。研究表明,2000—2020年间,茂县干旱河谷区域裸土面积共减少4 898.7 hm2,主要集中在沙坝镇、沟口镇、叠溪镇和凤仪镇区域,海拔分布在1 400~2 600 m之间。在近20年间,裸土面积呈先上升再逐步减少的趋势,客观反映了茂县干旱河谷裸土分布受地震灾害、生态治理等综合影响,分析结果表明通过人为治理可显著减少干旱河谷区域裸土面积,有效治理水土流失情况。
Maoxian county is a typical dry valley areas in Minjiang river basin, where soil erosion is serious and bare soil is widely distributed. By means of remote sensing and geographic information technology, the spatial and temporal dynamics of bare soil distribution in Maoxian arid valleys since 2000 were analyzed, and the spatial and temporal changes of bare soil on the surface of this area were counted by naked soil index extraction method. The results showed that from 2000 to 2020, the bare soil area in Maoxian arid valley decreased by 4 898.7 hm2, mainly concentrated in Shaba town, Goukou town, Diexi town and Fengyi town, with an altitude of 1 400-2 600 m. During the past 20 years,the bare soil area in arid valley increased first and then decreased gradually, which objectively reflected that the distribution of bare soil in Maoxian dry valley was affected by earthquake disaster and ecological treatment. The analysis indicates that artificial management can significantly reduce the bare soil area in arid valley regions and effectively control soil erosion.
作者
张好
杨小芳
罗智
杨育林
尤继勇
陈德朝
贺维
ZHANG Hao;YANG Xiaofang;LUO Zhi;YANG Yulin;YOU Jiyong;CHEN Dechao;HE Wei(Sichuan Key Laboratory of Ecological Restoration and Conservation for Forest and Wetland,Sichuan Academy of Forestry,Chengdu 610081,China;Maoxian Forestry and Grassland Bureau,Aba 623200,China;Wenchuan Forestry and Grassland Bureau,Aba 623000,China)
出处
《四川林业科技》
2023年第1期91-97,共7页
Journal of Sichuan Forestry Science and Technology
关键词
干旱河谷
遥感
裸土指数
岷江流域
Arid valley
Remote sensing
Bare soil index
Mingjiang river basin
