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Combining NDVI, PRI and the quantum yield of solar-induced fluorescence improves estimations of carbon fluxes in deciduous and evergreen forests
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SYSNO ASEP 0558026 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Combining NDVI, PRI and the quantum yield of solar-induced fluorescence improves estimations of carbon fluxes in deciduous and evergreen forests Author(s) Kováč, Daniel (UEK-B) RID, ORCID, SAI
Ač, Alexander (UEK-B) RID, ORCID, SAI
Šigut, Ladislav (UEK-B) RID, ORCID, SAI
Penuelas, Josep (UEK-B) ORCID, SAI, RID
Grace, John (UEK-B) SAI, RID
Urban, Otmar (UEK-B) RID, ORCID, SAIArticle number 154681 Source Title Science of the Total Environment. - : Elsevier - ISSN 0048-9697
Roč. 829, JUL (2022)Number of pages 18 s. Language eng - English Country NL - Netherlands Keywords induced chlorophyll fluorescence ; photochemical reflectance index ; sun-induced fluorescence ; net ecosystem exchange ; light-use efficiency ; radiation-use efficiency ; gross primary production ; photosynthesis ; field ; spectrometer ; 3-fld ; Chlorophyll fluorescence ; Eddy covariance fluxes ; ndvi ; Photochemical reflectance index ; Seasonal dynamics Subject RIV EF - Botanics OECD category Biophysics R&D Projects EF16_019/0000797 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2018123 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UEK-B - RVO:86652079 UT WOS 000798614200012 EID SCOPUS 85127005077 DOI 10.1016/j.scitotenv.2022.154681 Annotation We used automated spectroradiometers to continuously monitor changes in the optical parameters of phenological and photosynthetic traits in beech and spruce forests. We examined seasonal variations in the normalized difference vegetation index (NDVI), photochemical reflectance index (PRI), and solar-induced fluorescence in the oxygen A band (SIFA) that was estimated using a 3-FLD discrimination method from radiance data. The optical parameters tracked the activation and cessation of photosynthesis in spring and autumn. Data at photon fluxes >1200 mu mol m(-2) s(-1) during extended noon hours were used to link the seasonal PRI and SIFA variations to the dynamics of photosynthesis. Seasonal PRI was significantly correlated with photosynthetic light-use efficiency (LUE) with R-2 values of 0.66 and 0.48 for the measurements in beech and spruce forests, respectively. SIFA emissions were significantly correlated with the gross primary production (GPP) of the evergreen spruce forest (R-2 = 0.47), but R-2 was only 0.13 when measured in the beech forest. The correlations between the optical parameters and GPP or LUE, however, tended to be lower when using a dataset with constant NDVI. Introducing an equation combining NDVI, PRI, and the quantum yield of SIFA emission increased R-2 for LUE estimation to 0.77 in the spruce forest and 0.63 in the beech forest. GPP was estimated from the parametric equation with improved accuracy reaching R-2 = 0.53 and RMSE = 5.95 mu mol CO2 m(-2) s(-1) in spruce forest and R-2 = 0.58 and RMSE = 5.23 mu mol CO2 m(-2) s(-1) in beech forest. Parametric equations were more efficient in estimating photosynthesis in datasets that consisted of an entire season's data. By combining NDVI, PRI and the quantum yield of SIFA, we could thus substantially improve estimations of carbon fluxes in diverse deciduous and evergreen canopies. Workplace Global Change Research Institute Contact Nikola Šviková, svikova.n@czechglobe.cz, Tel.: 511 192 268 Year of Publishing 2023 Electronic address https://www.sciencedirect.com/science/article/pii/S0048969722017740#!
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