广东省水土流失重点防治区划分

Zoning of key prevention and control region of water and soil erosion in Guangdong province

划分广东省水土流失重点防治区,为省内水土保持规划编制和水土流失分区防治提供依据。以镇级行政区为基本划分单元,利用GIS技术,在水土流失现状综合调查的基础上,分析广东省水土流失重点防治区划分特点,采用定量、定性结合的方法,提出水土流失轻微率、水土流失高潜在危险区面积比及林草植被覆盖率等重点预防区划分定量指标,以及土壤侵蚀强度、崩岗侵蚀面积比、坡耕比等重点治理区划分定量指标,结合定性分析,构建出广东省水土流失重点防治区划分指标体系,对广东省的水土流失重点区域进行划分。结果表明:全省范围内划分出漠阳江上游和北江上中游2处省级水土流失重点预防区,面积约23 613. 52 km2,占国土面积的13. 13%;划分出鉴江上中游、榕江上中游和西江下游等3处省级水土流失重点治理区面积约8 211. 79 km2,占国土面积的4. 57%。本次划分成果使得广东省内水土流失重点防治管理更具操作性,便于精细化管理,为落实市县级政府水土保持目标责任考核和奖惩制度提供了重要依据。

[ Background ]The division of key prevention and control region for water and soil erosion in Guangdong province, can specified the key prevention and control points for water loss and soil erosion, and provide the basis for compiling water and soil conservation planning and water loss and soil erosion subregion prevention,also can guide the work of water and soil conservation planning at all levels in Guangdong province.[ Methods ] This paper took town-level administrative region as the basic division unit, through use GIS technology, combined with the unique natural conditions of Guangdong province,such as the characteristics of heavy rainfall and concentration and soil resistance to erosion is poor, according to relevant laws & regulations, planning and main function division of Guangdong province,at the same time analysis characteristics of soil and water loss control of Guangdong province, combine with quantitative analysis methods and qualitative analysis methods, put forward the quantitative index of the key prevention area of soil erosion, such as the ratio of light and micro area of soil and water loss, the ratio of the soil erosion potential danger area ,vegetation coverage of forest and grass and so on. also put forward the quantitative index of key control region of soil erosion, such as soil erosion intensity, the ratio of the slope disintegration erosion region, cultivated land area, the ratio of the cultivated land in slope cropland and so on. Combined with qualitative analysis, structure the index system of division of key prevention and control region of soil erosion, and then divided into key control region of soil and water loss of Guangdong province.[ Results ]The results show that within the Guangdong province, delineated two provincial key prevention region ,the name is the key prevention region of soil erosion of upper reaches of Moyang River and the key prevention region of soil erosion of upper and middle reaches of North River, the total area of the delineation region is 23 613.52 km 2 which accounting for 13.13% of the whole province. as well as delineated three provincial key control region, and the name is the key control region of soil erosion upper and middle reaches of Jian River, the key control region of soil erosion upper and middle reaches of Rong River and the key control region of soil erosion lower reaches of West River, the total area of the delineation region is 8 211.79 km 2 which accounting for 4.57% of the whole Guangdong province.[ Conclusions ] The results of the division of key prevention and control region of soil and water loss in Guangdong province made the key management of soil erosion more operational and convenient for meticulous management, also provides an important basis for implementing the responsibility assessment and reward and punishment system of soil and water conservation objectives at all levels of government.