基于RS的松嫩平原大安湖泊群面积提取与动态变化分析

The Extraction and Dynamic Analysis of Da-an Group Lakes Area in Songnen Plain Based on Remote Sensing

采用决策树分类法,利用1979年MSS、1989年TM、2001年ETM及2007年CBERS遥感影像,提取了大安湖泊群面积大于0.3km2的湖泊在4个不同时期的空间分布数据,得到了该湖群近30年来的面积动态变化结果,并分析了引起其变化的自然因素和人为因素。

：The distribution of Da-an Group Lakes was extracted with the method of decision tree from the series of satellite im- ageries： MSS in 1979, TM in 1989, ETM in 2001 and CBERS in 2007. The extraction rule is that the lake area should larger than 0.3 kmz. The dynamic area results in the last three decades were obtained, and the natural and artificial influencing factors were explored. According to the results, the sharp rise of Chagan area in 1989 leaded to the increasing of overall area of Da-an Group lakes from 359.7 kmz in 1979 to 495.3 kmz in 1989. Since then, the overall area began gradually shrank to 378.6 kmz till 2007. The area of small lakes less than 20 kmz was reduced by 129.0 kmz and their number was decreased by 42, such as Xiaoximi Lake, Liangjia Lake, Ping＇an Lake etc. Based on above mentioned, the natural factors, like the reducing precipitati- on, the warming and drying climate, caused the lake degradation, while the artificial factors accelerated the changes, for exam- ple conservancy facilities and agricultural cultivation. The water diversion project can ensure the stability of the large lakes, but its coverage is low, can not stop the shrinking trend of the majority of small lakes.