干旱区生态环境知识资源中心

Based on the remote sensing data of 1979, 2000 and 2010, we studied the wetland landscape pattern and its variation trend in the typical farming-pastoral zone--Duolun County. The result shows that: The wetland area increased during 1987 and 2010, and the total reduced area was 13504.63 hm2. During 1987 and 2000, the transfer rate of swamp wetland and river-reservoir wetland were -1.74% and -0.12%. Swamp wetland and river-reservoir wetland in the years 1987-2000 were reduced respectively by 1.74% and 0.12%. During 2000-2010, swamp wetland continued decreasing by 4.81%, but river-reservoir wetland increased by 0.18%. The transfer from wetland to non-wetland was that swamp wetland transferred to forest, grassland and farmland. The transfer rate from 2000 and 2010 was 1.3 times than the rate from 1987 and 2000. Internal transfer of wetland during 1987 and 2000 was swamp wetland net increase and during 2000 and 2010 was river-reservoir wetland net increase. The result of principal component analysis of driving force shows that: The main nature factors which made wetland decrease were arid and hot climate. Population increase and a series of chain reaction led to wetland decrease. Meanwhile, proper policy guide could solve the conflicts among population, resources and environment, and protect wetland.