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Study on the Inversion of Chlorophyll Content of Spartina Alterniflora Leaf in the Yangtze River Estuary Wetland based on Spectral Analysis#br# |
Wang Jiapeng1,2,3,Shi Runhe1,2,3,4,Zhang Chao1,2,3,Liu Pudong1,2,3,Zeng Yuyan1,2,3 |
(1.Key Laboratory of Geographic Information Science,Ministry of Education,
East China Normal University,Shanghai 200241,China;
2.School of Geographic Sciences,East China Normal University,Shanghai,200241,China;
3.Joint Laboratory for Environmental Remote Sensing and Data Assimilation,
ECNU andCEODE,Shanghai 200241,China;
4.Joint Research Institute for New Energy and the Environment,East China Normal University andColorado State University,Shanghai 200062,China) |
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Abstract Spartina alterniflora is one of the most important invasive species in the coastal wetlands in China,which have a profound impact on the local ecological system.The information of chlorophyll content is an important basic data for quantitative research on key ecological function of wetland ecosystem.The Yangtze River in Chongming Dongtan wetland is the study area.Based on the measured leaf spectral reflectance and total chlorophyll content of Spartina alterniflora,in the range of 400~1 000 nm,the ratio of the original form of the spectral reflectance and first derivative spectral reflectance(RVI)and normalized difference vegetation index(NDVI)in the form of combination are established for the correlation with the content of chlorophyll and the construction of the estimation model.The results show that RVI and NDVI vegetation index form model based on the original spectra have the highest accuracy,whose root mean square error(RMSE)are up to respectively 0.24 and 0.25;Because of the nosie in the first derivative spectral reflectance,the estimation model of chlorophyll has poor results;Based on the band selected from the model,the red edge band is particularly important in the estimation of chlorophyll content of Spartina alterniflora.
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Received: 07 November 2016
Published: 08 March 2018
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