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- W2052203871 abstract "This article explores the utility of spectral reflectance signals to assess changes in the photosynthetic efficiency (ΦPSII) of Sphagnum mosses exposed to reductions in water availability. Reflectance was measured in parallel to moisture content and chlorophyll fluorescence in five species of Sphagnum exposed to progressive drought. Decreases in moisture availability caused a significant reduction in ΦPSII for all samples tested. An objective was to ascertain whether Sphagnum ΦPSII was better correlated with (i) spectral indices directly related to photosynthetic processes through association with xanthophyll cycle pigmentation (the photochemical reflectance index; PRI), or (ii) indices indirectly correlated with photosynthetic activity but able to detect changes in canopy morphology (the normalized difference vegetation index; NDVI), chlorophyll stability (the structure insensitive pigment index; SIPI), or canopy moisture content (the floating water band index; fWBI). Strongest correlations were found between ΦPSII and indices which were indirectly related to ΦPSII. Both the SIPI and the NDVI exhibited linear correlations although these relationships were sometimes sample-specific. The fWBI was the index least affected by sample-specific relationships and showed a strong curvilinear correlation with ΦPSII. Photosynthetic efficiency was correlated with the PRI but relationships were much weaker than for the other indices used, and in some cases negative. The NDVI and the fWBI show the most potential for monitoring Sphagnum photosynthetic activity at the ecosystem scale. The results from this study will help to monitor and understand the responses of these key species to hydrological disturbances. Copyright © 2008 John Wiley & Sons, Ltd." @default.
- W2052203871 created "2016-06-24" @default.
- W2052203871 creator A5019249741 @default.
- W2052203871 date "2008-02-20" @default.
- W2052203871 modified "2023-10-05" @default.
- W2052203871 title "Spectral reflectance and photosynthetic properties of Sphagnum mosses exposed to progressive drought" @default.
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- W2052203871 doi "https://doi.org/10.1002/eco.5" @default.
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