科尔沁沙地退耕还林还草的生态效应分析——以通辽市奈曼旗为例

Ecological Effect Analysis of Returning Farmland to Forests or Grassland in Horqin Sand Land——With Naiman County in Tongliao City as an example

利用2000年、2002年和2004年三期遥感影像获得奈曼旗土地利用数据,并对各土地利用类型的相对生态价值进行模糊赋值,进而对其退耕还林还草的生态效益进行综合评价。研究结果表明:近5年奈曼旗退耕还林还草力度较大,退耕19620.16hm2,还林18578.37hm2,还草1041.79hm2,旗整体生态效应提高了2.8个百分点,退耕还林还草的贡献率达到28.17%,退耕还林还草生态效应显著。

This paper evaluates the ecological effect of returning farmland to forests or grassland, by using the land use data obtained from remote sensing images in 2000 2002 and 2004, and by evaluating ambiguously the relative ecological value of various kinds of land use. The research result indicates that in the past five years a lot of farmland has been returned to forests or grassland in Naiman County so that the ecological effect of Naiman County has been raised by 2.8 percent, the contribution of returning farmland to forests or grassland to ecological environment has reached 28.17 percent, the ecological effect of returning farmland to forests or grassland is evident.