The Analysis Of Agricultural Land Suitability Evaluation Based On Quantitative Raster Spatial Information In Linhe

Land suitability evaluation was finished according to the natural and social economical property of land and research of whether land was suitable to predicted application, the extent of suitability and its limitation, which could offer scientific foundation and assistance for utilization structure of regional land, adjustment of arrangement and land development planning, in order to let land resource applicatioin with most reasonable extent. This thesis collected basic data such as meteorology,quality and landform of land resource along the river and studied suitability of agricultural land along the river by vector-raster calculation and construction of evaluation mode. The result as following:1. Arable land in Linhe:Dimensions of first rate lands is27444hm2,which are mainly located on northern and middle part of area.Dimensions of second rate lands is166090hm2, which are located around the area. Dimension of third rate lands is15705hm2which are mainly located on southern part of area. Forestation-suitable lands are well-distributed around the area, of which the first rate land is4761hm2, second rate land is15623hm2, the third rate land is1570hm2.2. Among the first rate arable lands, the biggest size one is Ganzhaomiao town and the smallest one is Langshan town. Among the second rate arable lands, the biggest size one is Ganxinhua town and the smallest one is Shuanghe town. Among the thrid rate arable lands, the biggest size one is Langshan town and the smallest one is Shuanghe town. Among the first rate forestation-suitable lands, the biggest size one is Xinhua town and the smallest one is Bainaobao town. Among the second rate forestation-suitable lands, the distribution of each town is quite familiar with those of first rate. Dimensions of towns on the third rate is mostly average.3. In Linhe, from the south to the north, all rates lands belonging to arable type and forestation-suitable type are even distributed, of which the dimensions become gradually smaller. Size of second rate land is the biggest one, and size of other two rates is smaller.