一种三江平原湿地的植被冠层叶绿素反演

An inversion of wetland vegetation canopy chlorophyll in Sanjiang Plain

针对三江平原洪河湿地保护区内主要特征植被冠层的叶绿素含量,采用PROSAIL模型从物理角度进行反演。首先将叶面积指数、叶片结构参数、等价水厚度、叶绿素实测含量等一些植被理化参数的实测值输入模型得到模拟光谱数据,然后与实测光谱数据对比验证其准确性。在模型中,通过固定其他参量不变,取叶绿素含量为唯一值时,考察在不同叶面积指数下叶绿素含量对冠层反射率的影响。结果显示,植被冠层叶绿素含量的敏感波段为555nm和720nm。基于PROSAIL模型的叶绿素反演方法较传统的统计模型相比是较好且稳健的方法。

Based on the PROSAIL model,the chlorophyll content of the vegetation canopy in the protected area of the Sanjiang plain was retrieved from the physical point of view.Firstly,some vegetation physical parameters measured value such as the leaf area index,leaf structure parameters,equivalent water thickness,the content of the chlorophyll measured and so on were input into the PROSAIL model to simulate spectral data and compared with the measured spectral data and verify accuracy.In this model,the effect of chlorophyll content on canopy reflectance under different leaf area index was investigated by fixing the other parameters and taking the chlorophyll content as the unique value.The results showed that the chlorophyll content of vegetation canopy sensitive bands is 555 nm and 720 nm.Compared with the traditional statistical model,the chlorophyll inversion method based on PROSAIL model is a better and robust method.