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江苏省地处江淮下游,总面积10余万平方公里,地貌类型多样,山、丘、岗、平(原)、圩、湖、海皆有。其中山丘岗地面积为1.5万多平方公里,约占总面积的15％。丘陵大部分高程在100～300米之间,岩体大多由砂页岩、灰岩、花岗片麻岩、玄武岩等组成:岗地高程一般在10～100米,地势是波状起伏,顶部平坦,坡度一般为5～8度,最大15度左右。由于上述地质地貌因素,加之我省人口密度大,人类活动频繁,一些丘陵山体作为建筑材料、矿石资源被开采,岗地大多又辟为耕地,因此,丘陵和岗地是我省水土流失的主要地貌类型。据人工调查和卫片解译,我省山丘岗地区现有水土流失面积9162平方公里,其中:Ⅱ
Jiangsu Province is located in the lower reaches of the Jianghuai, a total area of more than 10 million square kilometers, diverse types of landforms, mountains, mounds, Kong Ping (original), Wei, lake, the sea Jieyou. Hilly area of which more than 15,000 square kilometers, accounting for about 15% of the total area. Most of the hills are between 100 and 300 meters in elevation. Most of the rock mass is composed of sand shale, limestone, granite gneiss, and basalt. The elevation of the hillock is generally 10 to 100 meters. The terrain is undulating and the top is flat. Slope is generally 5 to 8 degrees, the maximum about 15 degrees. Due to the above geological and geomorphological factors, as well as the large population density and frequent human activities in our province, some hills and mountains are used as construction materials and the ore resources are exploited, and most of them are turned into cultivated land. Therefore, the hills and posts are the main landform types of soil and water loss in our province . According to the manual survey and the interpretation of the tablet, the hillock hillock area in our province has an area of 9162 square kilometers of soil and water loss, in which: Ⅱ