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冰川冻土  2012 

塔里木河下游生态输水后植被景观格局动态变化研究

, PP. 161-168

Keywords: 植被景观格局,动态变化,生态输水,塔里木河下游

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Abstract:

2000-2005年,塔里木河流域管理局先后7次向塔里木河下游断流区进行了生态输水,输水河道两岸的植被得到了一定的恢复.以2000-2005的中巴资源卫星CCD影像为主要数据源,获得了6a的植被/非植被二值图,并计算各年的景观格局指数,分析了6a植被景观格局的变化.结果表明植被景观动态度在第四时段(2003-2004年)最大,为47.83%;在第三时段(2002-2003年)最小,为-1.39%;2000-2005年植被景观的动态变化呈正向趋势.2000-2005年,植被景观斑块个数与景观形状指数增加,蔓延度指数下降了36.9,斑块结合度指数均高于99,表明研究区的植被景观破碎化程度、分离程度增加,而景观类型联通性较高.植被斑块面积均处于增加趋势且远离河道植被恢复率越小,但植被景观的比重仍小于50%,说明非植被类型是研究区的基质类型,组成了景观的最大斑块.针对缓冲区Zone1,植被景观的平均分维数处于减小趋势且2005年的斑块个数最小,斑块结合度指数处于增加趋势,表明近河道区域植被较为稳定,受生态输水的干扰度较小,植被景观斑块之间越来越聚集.6a间Zone1的植被最大斑块指数均大于10%,远高于其它5个缓冲带,表明离河道越近植被景观的优势度最大.

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