中国东北山地集水区和溪流结构模拟分析

MODEL AND ANALYSIS OF STRUCTURE FOR WATERSHED AND STREAM IN MOUNTAIN AREA OF NORTHEAST OF CHINA

利用GTOPO30DEM数据模拟了东北东部山地的集水区和溪流结构 ,并结合坡度和海拔研究了溪流等级在地域上分布的特征 .根据溪流建立 5 0mBUFFER区 ,然后研究了不同等级溪流的BUFFER区内NDVI的分布特征 .最后得出 ,溪流等级与海拔、坡度和NDVI都呈负相关 ,相关系数分别为 :- 0 .2 ,- 0 .0 9和 - 0 .18.溪流由低等级向高等级变化时 ,其空间分布范围逐渐集中于海拔较低、坡度较小的平缓地 .低等级溪流周围的植被生长好于高等级溪流周围的植被 ,并相对稳定 .

The structure of watersheds and streams in the mountains of northeast is modeled with GTOPO30 DEM data. The spatial distribution of different order's streams is studied with the slope and elevation data. The BUFFER areas that the width is 50 meters by streams are built, then the distribution characters of NDVI in BUFFER area of different orders streams are studied. Finally, it concludes that the order of stream is a negative relation to elevation,slope and NDVI.The correlation coefficient is -0.2,-0.09 and -0 18, respectively. With enhance of stream's order, the spatial distribution of streams tends to area in which the elevation is lower and slope is mild. The vegetation around lower order's streams is better than that around higher order's streams, and the change of NDVI around lower order's streams is more stable than that around higher order's streams.