成都平原湿地动态监测与分析

摘要

Using normlized water index,the thematic information of wetland resources in Chengdu plain was extracted from three periods of 1990,2000 and 2007.The extracted wetland resources included rivers,lakes,ponds and some paddy fields.The wetland area was 322.58 km2 in 1990,the wetland area was 450.98 km2 in 2000,the wetland area was 465.67 km2 in 2007.Overall,the wetland area in Chengdu plain showed an increasing trend during 1990-2007;it increased at 12.84 krn2/a from 1990 to 2000,and increased with 2.10 km2/a dtring 2000-2007.Therefore,the ecological environment of the study area was better,and the wetland maintained a good growth trend before 2000.After 2000,the wetland area tended to be stable,and the protection of wetland ecological environment needs to be strengthened.Chengdu plain due to the interference of natural and artificial factors,the wetland landscape pattern from the aspects of the area have undergone great changes,the trend of change of wetland landscape have specified significance of wetland restoration and protection policy.%采用归一化水体指数,对1990、2000、2007年3个时段的成都平原湿地资源专题信息进行提取.提取的湿地资源信息包括河流、湖泊、库塘、部分水田等.1990年提取的湿地面积为322.58 km2,2000年提取的湿地面积为450.98km2,2007年提取的湿地面积为465.67 km2.整体来看,1990-2007年成都平原湿地面积呈现增加趋势;1990-2000年,以12.84 km2/a的速率增加,2000-2007年,以2.10 km2/a的速率增加,由此可见,研究区在2000年前生态环境较好,湿地保持较好的增长趋势,而2000年后,湿地面积趋于平稳,湿地生态环境的保护有待加强.成都平原由于人为和自然因素的共同干扰,其湿地资源从景观格局到面积等方面都发生了很大变化,研究湿地景观的变化趋势对于湿地恢复与保护政策意义重大.