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湖泊科学  2007 

小球藻和铜绿微囊藻的高浓度Chl-a高光谱定量模型

DOI: 10.18307/2007.0306

Keywords: 叶绿素,高光谱,小球藻,铜绿微囊藻,单波段法,波段比值法,一阶微分法

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Abstract:

本研究将地物高光谱遥感技术应用于室内实验,从而得到小球藻和铜绿微囊藻的高光谱特征。通过多种半经验方法,如单波段、波段比值和微分法,建立了两藻种最优的Chl-a高光谱定量模型,并与室外情况进行了对比。结果表明:小球藻的最优定量模型为Chl-a=174.6+1138292(R703)'+2.3(109[(R703']2(p<0.01),相应的方法适宜性为:一阶微分法>单波段法>波段比值法;铜绿微囊藻的最优定量模型为Chl-a=5299164(R757)1.9773(p<0.01),相应的方法适宜性为:单波段法>波段比值法>一阶微分法;从高光谱特征来看,小球藻在540nm和700nm附近存在明显的特征波峰,其位置随Chl-a浓度增大而向长波方向偏离,铜绿微囊藻在530nm、660nm和700nm附近存在3个较强的特征波峰,在610nm和680nm附近存在明显的波谷;与以往室外研究不同的是铜绿微囊藻的反射率在400-500nm之间的R值并不低,是因为没有非藻类颗粒物的影响,总吸收明显降低。

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