三江平原桦南县景观格局时序变化与驱动因素研究

基于RS和GIS技术，集成地形图与遥感影像（MSS、TM）数据，对1954-2005年三江平原桦南县景观格局动态变化特征与驱动力进行分析。结果表明，过去50年间，桦南县景观格局发生了剧烈变化，耕地和林地是研究区面积最大的2种景观类型，1986年以后，耕地成为研究区面积最大的景观类型。1954-1976年期间耕地面积增加速率较大，主要是草地、湿地大面积被开垦为耕地；1976-1986年期间，有大面积湿地、林地转化为耕地；1986年以后，各景观类型面积变化趋势变缓。景观指数在过去几十年期间都发生了重大变化，农业的大规模开发与以上景观指数的变化规律存在密切关系。气候变暖和人类活动的增强共同作用于区域景观格局。

Changes in Iandscape patterns and driving forces in Huanan County,Sanjiang Plain,over the past 50 years

Based on RS and GIS technology, incorporating topographic maps and Landsat MSS and TM data, the dynamic characteristics of landscape patterns were analyzed in Huanan County, Sanjiang Plain from 1954 to 2005. In addition, driving forces affecting these changes were also explored. Results showed that, during the past 50 years, landscape patterns have undergone significant changes. Cropland and woodland are the two biggest landscape types. After 1986, cropland have become the biggest landscape type of the study area. During the period 1954-1976, cropland increased fast, mainly converted from grassland and swampland. From 1976 to 1986, lots of swampland and woodland were transformed into cropland. Changing trend of landscape area was lessened. Landscape indices changed remarkably in the past decades. Large-scale agricultural development was responsible for changes of landscape indices. Climate warming and increase of human activities affected regional landscape patterns.