亚热带水土保持
亞熱帶水土保持
아열대수토보지
SUBTROPICAL SOIL AND WATER CONSERVATION
2014年
1期
15-18,49
,共5页
邝高明%刘银迪%郝名利%王敬贵%刘超群
鄺高明%劉銀迪%郝名利%王敬貴%劉超群
광고명%류은적%학명리%왕경귀%류초군
小流域综合治理%土壤侵蚀强度变化%土地利用变化
小流域綜閤治理%土壤侵蝕彊度變化%土地利用變化
소류역종합치리%토양침식강도변화%토지이용변화
small watershed comprehensive management%soil erosion strength variation%land use variation
土地利用结构调整和减少土壤侵蚀面积、降低土壤侵蚀强度是小流域综合治理工程的主要效益,小流域综合治理前后土地利用和土壤侵蚀变化分析是评价工程实施效益的重要方面。以云贵鄂渝水土保持世行贷款/欧盟赠款项目重点监测小流域-盆古小流域为研究对象,基于治理前后的两期高分辨率遥感影像和eCogni-tion、Arcgis软件,对盆古小流域治理前后的土地利用和土壤侵蚀变化情况进行了分析研究。结果表明:2008~2011年盆古小流域旱地、水田等面积减少,有林地和梯田等面积增加;小流域轻度侵蚀在有林地中分布最多,而轻度以上侵蚀主要分布在旱地中;另外,小流域土壤侵蚀这一期间整体呈现由强转弱的趋势,表明小流域综合治理工程取得了明显成效。
土地利用結構調整和減少土壤侵蝕麵積、降低土壤侵蝕彊度是小流域綜閤治理工程的主要效益,小流域綜閤治理前後土地利用和土壤侵蝕變化分析是評價工程實施效益的重要方麵。以雲貴鄂渝水土保持世行貸款/歐盟贈款項目重點鑑測小流域-盆古小流域為研究對象,基于治理前後的兩期高分辨率遙感影像和eCogni-tion、Arcgis軟件,對盆古小流域治理前後的土地利用和土壤侵蝕變化情況進行瞭分析研究。結果錶明:2008~2011年盆古小流域旱地、水田等麵積減少,有林地和梯田等麵積增加;小流域輕度侵蝕在有林地中分佈最多,而輕度以上侵蝕主要分佈在旱地中;另外,小流域土壤侵蝕這一期間整體呈現由彊轉弱的趨勢,錶明小流域綜閤治理工程取得瞭明顯成效。
토지이용결구조정화감소토양침식면적、강저토양침식강도시소류역종합치리공정적주요효익,소류역종합치리전후토지이용화토양침식변화분석시평개공정실시효익적중요방면。이운귀악투수토보지세행대관/구맹증관항목중점감측소류역-분고소류역위연구대상,기우치리전후적량기고분변솔요감영상화eCogni-tion、Arcgis연건,대분고소류역치리전후적토지이용화토양침식변화정황진행료분석연구。결과표명:2008~2011년분고소류역한지、수전등면적감소,유임지화제전등면적증가;소류역경도침식재유임지중분포최다,이경도이상침식주요분포재한지중;령외,소류역토양침식저일기간정체정현유강전약적추세,표명소류역종합치리공정취득료명현성효。
Main benefits of the small watershed comprehensive management include the adjustment of the land use structure , reduction of the soil erosion areas and the reduction of soil erosion strength .The land use before&after the small watershed comprehensive management and the soil erosion variation analysis are the important aspects in the as -sessment of the project implementation benefits .Based on the high -resolution RS images took before and after the management with the software such as the eCognition , Arcgis,the analysis and study was conducted on the land use and soil erosion variation before and after the management of the Pengu Small Watershed , that is under the Key Moni-toring Small Watershed of the World Bank Loan /EU Grant Project of Yunnan ,Guizhou , Hubei and Chongqing Prov-inces .The results showed that from 2008 to 2011 the area of dry land and paddy land reduced while the areas of forest and terrace increased .Most of the slight erosion is located in the forest land , while the erosion level higher than slight erosion is mainly located in the dry land .In addition , the soil erosion of small watershed during the period appeared the trend of slowing down , that indicate the small watershed comprehensive management reached the obvious achievement .