洱海流域土地利用格局研究

基于GIS和Erdas平台，利用2007年TM影像，对洱海流域不同高程、不同方位的用地方式、布局状态及其景观格局进行了研究。研究表明，洱海流域以有林地、灌木林地、草地、农田、水域用地5类用地方式为主，但用地布局和格局不甚合理；从不同方位布局看，东部和南部片区的景观破碎度相对较高，景观连通性相对较低。建议将高干扰用地景观部分向洱海东部片区转移，并优化和重组洱海流域景观结构。

Research on Structures and Patterns of Land Use of Erhai Watershed

Based on the technology of GIS and ERI）AS, the structures and patterns of land use （LU） of the Erhai watershed in different attitudes and directions were analyzed by the TM image of 2007 year. It shows that the main types of LU in the Erhai valley is forest, shrub, grassland, farmland and water. The structure and landscape of LU is not very reasonable. In terms of the elevation patterns of LU, the interference - low ecological health land （ ie. residence land and farmland） was distributed the region, which attitude isn＇ t more than 2200 meters and surrounds the Erhai lake. The low interference -high ecological heath is mostly found in the region, which attitude is more than 2800 meters. In terms of the layout in different directions of LU, the landscape pattern of relatively high fragmentation degree -low connectivity is exhibited in the eastern region and southern ones in Erhai basin. After taking into account of that condition whose density of drainage system is relatively low, we suggest that the landscape and layout of LU in the eastern region of Erhai watershed is optimized so as to make the whole function of ecosystem of Erhai watershed be enhanced.