三十年来西辽河流域湿地景观格局演变分析

Study on Wetland Landscape Pattern Evolution in West Liao River Basin for Thirty Years

为了研究近30年内西辽河流域湿地景观格局变化特征,本文基于1985年TM数据、2000年ETM数据和2015年OLI数据,利用景观格局软件Fragstats4.2,选取了8个景观格局指标,进而分析30年来西辽河湿地景观格局变化情况,结果表明:1)各湿地类型总斑块数和斑块密度呈下降趋势,湿地逐渐转化为建设用地和非建设用地,湿地主导类型变为人工湿地;2)研究区湿地破碎化虽然有所减弱,但景观格局变化依然明显;3)湿地大面积减少,湿地多样性大大降低,空间连通性较优,景观类型趋于单一化。

In order to analysis the wetland landscape pattern evolution in West Liao River Basin for thirty years,based on TM data in1985,ETM data in 2000,OLI data in 2015,using of Fragstats 4.2,choosing eight landscape pattern indexes,analyzing wetland landscape pattern change in West Liao River Basin from 1985 to 2015,the result shows that:( 1) Patch number and density of all types of wetland are reduced;wetland convert to construction and non-construction land,the dominant type of wetland is constructed wetland;( 2) While landscape fragmentation of wetland is decrease,the landscape pattern change is obviously;( 3) With the huge reduction of wetland,the diversity is reduced,spatial connectivity is better,the landscape types tends to singleness.