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基于FCD模型的且末绿洲植被覆盖度时空变化分析

DOI: 10.6046/gtzyyg.2013.02.22, PP. 131-137

Keywords: 复合植被指数,植被覆盖,遥感反演,FCD模型,且末绿洲

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Abstract:

利用新疆维吾尔自治区且末绿洲1998年、2001年、2006年、2011年4期TM/ETM+图像,基于森林郁闭度制图模型FCD模型(forestcanopydensitymappingmodel,FCD)构造复合植被指数,对且末绿洲地区近13a的植被覆盖度进行了反演,得到植被覆盖度等级图,分析并揭示出且末绿洲植被覆盖的时空变化特征,对其变化的影响因素进行了探讨。总体来说,且末绿洲13a来总植被覆盖面积增加了742.64km2,绿洲在向外扩张;各阶段的植被覆盖度变化表现出波动性,1998-2001年、2006-2011年间植被恢复面积(植被向较高覆盖度转移)分别是植被退化面积(植被向较低覆盖度转移)的2.98倍和1.79倍,植被恢复状态较好,而2001-2006年间出现较严重的植被退化状况,植被退化面积为435.3km2,植被恢复面积仅为5.41km2;且末绿洲植被覆盖度的变化受春夏季温度、降水及大规模的防护林、灌溉系统建设等多重因素的影响。

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