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Quantifying water stress effect on daily light use efficiency in Mediterranean ecosystems using satellite data

AuthorsSánchez-Ruiz, Sergio; Moreno, Álvaro; Piles, María ; Maselli, Fabio; Carrara, Arnaud; Running, Stven; Gilabert, María Amparo
KeywordsLight use efficiency
Water stress
Mediterranean ecosystems
Issue DateFeb-2017
PublisherTaylor & Francis
CitationInternational Journal of Digital Earth 10(6): 623-638 (2017)
AbstractThe capacity of six water stress factors (ε′i) to track daily light use efficiency (ε) of water-limited ecosystems was evaluated. These factors are computed with remote sensing operational products and a limited amount of ground data: ε′1 uses ground precipitation and air temperature, and satellite incoming global solar radiation; ε′2 uses ground air temperature, and satellite actual evapotranspiration and incoming global solar radiation; ε′3 uses satellite actual and potential evapotranspiration; ε′4 uses satellite soil moisture; ε′5 uses satellite-derived photochemical reflectance index; and ε′6 uses ground vapor pressure deficit. These factors were implemented in a production efficiency model based on Monteith’s approach in order to assess their performance for modeling gross primary production (GPP). Estimated GPP was compared to reference GPP from eddy covariance (EC) measurements (GPPEC) in three sites placed in the Iberian Peninsula (two open shrublands and one savanna). ε′i were correlated to ε, which was calculated by dividing GPPEC by ground measured photosynthetically active radiation (PAR) and satellite-derived fraction of absorbed PAR. Best results were achieved by ε′1, ε′2, ε′3 and ε′4 explaining around 40% and 50% of ε variance in open shurblands and savanna, respectively. In terms of GPP, R2 ≈ 0.70 were obtained in these cases
Description16 pages, 2 figures, 6 tables, supplemental material https://dx.doi.org/10.1080/17538947.2016.1247301
Publisher version (URL)https://doi.org/10.1080/17538947.2016.1247301
Identifiersdoi: 10.1080/17538947.2016.1247301
issn: 1753-8947
e-issn: 1753-8955
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