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| Definition of arsenic rock zone borderline and its classification |
| Wang Yuanchang1,Wu Yonghong2,Kou Quan2,Min De'an2,Chang Yuzhong2,Zhang Rongjun2 |
| 1.China National Administration Center for Seabuckthorn Development,100038,Beijing;2.Xifeng Soil and Water Conservation Institute,YRCC,745000,Qingyang,Gansu: China |
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Abstract Taking the TM remote sensing data as the main information source,route survey and typical small watershed survey were used as the methods.Through massive field investigation,the image interpretion signs of different types of soft rock was established.With the supporting of geographic information system,by the meathod of computer assistanted artificial interpretion,the bordline of the soft rock was defined which mainly takes Shanxi,Shaanxi and Inner Mongolia contiguous area as its distribution center,and divided it into such three type areas as the exposed area,the loess covered area and the sand covered area.The distributive scope and the area size of each type have been determined.The result showed that the soft rock with the total area of 16 700 km2,of which exposed area 4 543.89 km2,sand covered area 3 709.18 km2,loess covered area 8 432.41 km2,separately accounts for the total area 27.2%,22.2% and 50.6%,areas of soft rock were defined.
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Received: 22 September 2006
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