Variations in mangrove canopy chlorophyll content with respect to species, submerged conditions and seasonality

Authors: Chen Shi*, Capital Normal University, Xile Cao, Capital Normal University, Le Wang, University at Buffalo, The State University of New York
Topics: Remote Sensing, Biogeography, Coastal and Marine
Keywords: Landsat images, mangroves, canopy chlorophyll content, seasonal variation, species, submerged conditions
Session Type: Paper
Day: 4/12/2018
Start / End Time: 3:20 PM / 5:00 PM
Room: Bonaparte, Marriott, River Tower Elevators, 4th Floor
Presentation File: No File Uploaded

Chlorophyll content is an important biophysical parameter that reflects the physiological state of vegetation and environmental stresses. It is affected by seasonality, species, submerged conditions. The seasonal variations in mangrove chlorophyll content have been studied by remote sensing, but they do not take into account the impact of submerged conditions. Therefore, the present study aimed to explore the variations in mangrove canopy chlorophyll content (CCC) of different submerged conditions, species and seasons by remote sensing. First, the submerged conditions were obtained by combining Landsat8 images with tidal data, in which the mangroves were successfully divided into two submerged conditions: often flooded area (OFA) and rarely flooded area (RFA). Then, the green chlorophyll index (GCI) was considered as the optimal index (R2 = 0.7635) representing mangrove CCC. Finally, the changes of mangrove GCI were analyzed. We found that the distribution difference of mangrove GCI was significant between OFA and RFA for all test species and seasons, with mangroves growing better in RFA. The distribution of mangrove GCI between Avicennia marina and Kandelia candel had the largest difference in autumn especially in OFA. Furthermore, the distribution difference of GCI between summer and the other three seasons were significant as compared to the insignificant distribution difference observed between winter and spring for any of the submerged conditions and species, such that mangroves grew better in summer.

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