{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,18]],"date-time":"2026-07-18T17:03:19Z","timestamp":1784394199751,"version":"3.55.0"},"reference-count":108,"publisher":"MDPI AG","issue":"12","license":[{"start":{"date-parts":[[2013,12,9]],"date-time":"2013-12-09T00:00:00Z","timestamp":1386547200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The utilization of remotely sensed observations for light use efficiency (LUE) and tower-based gross primary production (GPP) estimates was studied in a USDA cornfield. Nadir hyperspectral reflectance measurements were acquired at canopy level during a collaborative field campaign conducted in four growing seasons. The Photochemical Reflectance Index (PRI) and solar induced chlorophyll fluorescence (SIF), were derived. SIF retrievals were accomplished in the two telluric atmospheric oxygen absorption features centered at 688 nm (O2-B) and 760 nm (O2-A). The PRI and SIF  were examined in conjunction with GPP and LUE determined by flux tower-based measurements. All of these fluxes, environmental variables, and the PRI and SIF exhibited diurnal as well as day-to-day dynamics across the four growing seasons. Consistent with previous studies, the PRI was shown to be related to LUE (r2 = 0.54 with a logarithm fit), but the relationship varied each year. By combining the PRI and SIF in a linear  regression model, stronger performances for GPP estimation were obtained. The strongest relationship (r2 = 0.80, RMSE = 0.186 mg CO2\/m2\/s) was achieved when using the PRI  and SIF retrievals at 688 nm. Cross-validation approaches were utilized to demonstrate  the robustness and consistency of the performance. This study highlights a GPP retrieval method based entirely on hyperspectral remote sensing observations.<\/jats:p>","DOI":"10.3390\/rs5126857","type":"journal-article","created":{"date-parts":[[2013,12,9]],"date-time":"2013-12-09T12:47:59Z","timestamp":1386593279000},"page":"6857-6879","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":95,"title":["Integrating Solar Induced Fluorescence and the Photochemical Reflectance Index for Estimating Gross Primary Production in a Cornfield"],"prefix":"10.3390","volume":"5","author":[{"given":"Yen-Ben","family":"Cheng","sequence":"first","affiliation":[{"name":"Earth Resources Technology, Inc., Laurel, MD 20707, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elizabeth","family":"Middleton","sequence":"additional","affiliation":[{"name":"Biospheric Sciences Laboratory, Goddard Space Flight Center, National Aeronautics and Space Administration, Greenbelt, MD 20771, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qingyuan","family":"Zhang","sequence":"additional","affiliation":[{"name":"Universities Space Research Association, Columbia, MD 21044, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karl","family":"Huemmrich","sequence":"additional","affiliation":[{"name":"Joint Center for Earth Systems Technology, University of Maryland Baltimore County,  Baltimore, MD 21250, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Petya","family":"Campbell","sequence":"additional","affiliation":[{"name":"Joint Center for Earth Systems Technology, University of Maryland Baltimore County,  Baltimore, MD 21250, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lawrence","family":"Corp","sequence":"additional","affiliation":[{"name":"Sigma Space Corporation, Lanham, MD 20706, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bruce","family":"Cook","sequence":"additional","affiliation":[{"name":"Biospheric Sciences Laboratory, Goddard Space Flight Center, National Aeronautics and Space Administration, Greenbelt, MD 20771, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5727-4350","authenticated-orcid":false,"given":"William","family":"Kustas","sequence":"additional","affiliation":[{"name":"Hydrology and Remote Sensing Laboratory, USDA Agricultural Research Service,  Beltsville, MD 20705, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Craig","family":"Daughtry","sequence":"additional","affiliation":[{"name":"Hydrology and Remote Sensing Laboratory, USDA Agricultural Research Service,  Beltsville, MD 20705, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2013,12,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"834","DOI":"10.1126\/science.1184984","article-title":"Terrestrial gross carbon dioxide uptake: Global distribution and covariation with climate","volume":"329","author":"Beer","year":"2010","journal-title":"Science"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1484","DOI":"10.1111\/j.1365-2486.2007.01352.x","article-title":"Can we measure terrestrial photosynthesis from space directly, using spectral reflectance and fluorescence?","volume":"13","author":"Grace","year":"2007","journal-title":"Glob. 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