Hyperspectral Identification of Chlorophyll Fluorescence Parameters of Suaeda salsa in Coastal Wetlands

The stomata of Suaeda salsa are closed and the photosynthetic efficiency is decreased under conditions water–salt imbalance, with change to photosynthesis closely related chlorophyll fluorescence parameters photosystem PSII. Accordingly, were selected monitor growth status in coastal wetlands water salt. Taking as research object, we set up five groundwater levels (0 cm, –5 –10 –20 –30 cm) six NaCl salt concentrations (0%, 0.5%, 1 %, 1.5%, 2%, 2.5%) carry out independent tests potted plants measured canopy reflectance spectrum salsa. A polynomial regression method was used hyperspectral identification stress. results indicated that Fv/Fm, Fm', ?PSII showed significant relationships vegetation index conditions. sensitive band ranges 680–750 nm, 480–560 950–1000 1800–1850 1890–1910 nm. Based on first-order differential spectrum, spectral ratio A/B constructed analyze correlation between it We thirteen new indices. In addition, discovered D690/D1320 retrieved parameter Fv/Fm highest accuracy, a multiple determination coefficient R2 0.813 an RMSE 0.042, D725/D1284 model 0.848 0.096. can be retrieve conditions, providing theoretical technical support for future large-scale remote sensing inversion parameters.