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OALib Journal期刊
ISSN: 2333-9721
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基于modis反演的2000―2011年江西省植被叶面积指数时空变化特征
DOI: 10.3969/j.issn.1000-2006.2013.01.002, PP. 11-17
Keywords: 叶面积指数,4-尺度几何光学模型,遥感反演,江西省
Abstract:
叶面积指数(lai)是陆地植被的重要结构参数之一,是陆地生态系统生产力模型和气候、水文、生物地球化学等模型的关键输入参数。笔者基于modis-mod09a1反射率数据,利用4-尺度几何光学模型反演了2000―2011年江西省植被lai。结果表明:(1)江西省植被lai呈现出明显的季节变化,1年中1―2月lai值较低(最低为1月,平均值为0.85),3―4月随着植被生长,lai值逐渐增大,到6―8月,lai达到最大值,最大值为7月的4.8,约为最小月份平均值的5.6倍,9月以后,lai值逐渐减少;(2)2000―2007年江西全省生长季lai呈增加趋势,2008―2011年lai平均值呈下降趋势,2000―2011年全省生长季lai平均值呈下降趋势,平均下降0.048;(3)江西省不同植被类型的lai值差异较大,2000―2011年间,各植被类型lai平均值从大到小顺序为:常绿针叶林(5.67)、常绿阔叶林(4.57)、混交林(4.01)、落叶阔叶林(3.17)、农作物/自然植被混合(2.08)、高郁闭度灌木(1.92)、农作物(1.85)。2000―2011年江西全省植被lai的平均值为3.60。
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