Zhang Shaokang, Butto Valentina, Khare Siddhartha, Deslauriers Annie, Morin Hubert, Huang Jian-Guo, Ren Hai et Rossi Sergio. (2020). Calibrating phenoCam data with phenological observations of a black spruce stand. Canadian Journal of Remote Sensing, 46, (2), p. 154-165.
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URL officielle: http://dx.doi.org/doi:10.1080/07038992.2020.176125...
Résumé
Bud and leaf development are important phenological events and help in defining the growing period of trees. Canopy greenness derived from PhenoCam has been used to investigate leaf phenology. Questions remain on how much the continuous records of canopy greenness represent bud developmental phases, and how growing period boundaries are related to canopy greenness and bud phenology. In this study, we compared bud phenology of black spruce [Picea mariana (Mill.) B.S.P] during 2015, 2017 and 2018 with the canopy greenness, represented by Green Chromatic Coordinate (GCC), derived from PhenoCam images of a boreal stand in Quebec, Canada. Logit models were applied to estimate the probability of observing sequential phenological phases of bud burst and bud set along with GCC. GCC showed a bell-shaped pattern, with a slow increase in spring, a peak in summer and a gradual decrease in autumn. The start and end of budburst, and bud set, occurred when GCC reached 72% and 92% (spring), and 94% (autumn) of its maximum amplitude, respectively. These GCC values are reliable thresholds indicating the growing period boundaries. Our study builds a bridge between phenological observations and automatic near-surface remote sensing, providing a statistically sound protocol for calibrating PhenoCam with field observations.
Type de document: | Article publié dans une revue avec comité d'évaluation |
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ISSN: | 0703-8992 |
Volume: | 46 |
Numéro: | 2 |
Pages: | p. 154-165 |
Version évaluée par les pairs: | Oui |
Date: | 2020 |
Identifiant unique: | 10.1080/07038992.2020.1761251 |
Sujets: | Sciences naturelles et génie > Sciences appliquées > Climatologie et météorologie Sciences naturelles et génie > Sciences appliquées > Foresterie et sciences du bois Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes |
Département, module, service et unité de recherche: | Départements et modules > Département des sciences fondamentales Unités de recherche > Centre de recherche sur la Boréalie (CREB) |
Mots-clés: | chromatic coordinate, field observations, leaf development, maximum amplitude, phenological observations, Quebec (Canada), shaped pattern, sound protocol |
Déposé le: | 23 mai 2023 16:21 |
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Dernière modification: | 23 mai 2023 16:21 |
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