Abstract
A critical variable in the estimation of gross primary production of terrestrial ecosystems is light-use efficiency (LUE), a value that represents the actual efficiency of a plant’s use of absorbed radiation energy to produce biomass. Light-use efficiency is driven by the most limiting of a number of environmental stress factors that reduce plants’ photosynthetic capacity; these include short-term stressors, such as photoinhibition, as well as longer-term stressors, such as soil water and temperature. Modeling LUE from remote sensing is governed largely by the biochemical composition of plant foliage, with the past decade seeing important theoretical and modeling advances for understanding the role of these stresses on LUE. In this article we provide a summary of the tower-, aircraft-, and satellite-based research undertaken to date, and discuss the broader scalability of these methods, concluding with recommendations for ongoing research possibilities.
Highlights
In this article we provide a summary of the tower, aircraft, and satellite-based research undertaken to date, and discuss the broader scalability of these methods, concluding with recommendations for ongoing research possibilities
Terrestrial carbon absorption is known as gross primary production (GPP), or the gross carbon uptake of vegetation through photosynthesis
Gross primary production can be defined as the product of the absorbed photosynthetically active radiation (APAR), which is the absorbed solar radiation between 400 and 700 nanometers wavelength, and light-use efficiency (LUE), which represents the actual efficiency of a plant’s use of absorbed radiation energy to produce biomass (Monteith 1977)
Summary
Estimation of Light-use Efficiency of Terrestrial Ecosystem from Space: A Status Report. Research in past decades has led to the advent of high-spectral-resolution optical sensors that can be mounted on towers, aircraft, and satellites, and that are capable of detecting changes in leaf spectral properties with a high temporal frequency These sensors have allowed the scientific community to revisit a number of existing approaches for modeling GPP and reassess the potential for using remotely sensed inputs, with the ultimate aim of developing GPP models driven solely by satellite-based observations (Running et al 2004). Morphological differences in leaf thickness and the number of stomata ensure the greatest possible use of photosynthetic potential These differences allow sun-exposed leaves to tolerate higher levels of radiation without reducing their photosynthetic efficiency, and enable shaded leaves to photosynthesize even under low-light conditions. The spectral sensitivity of any detection device must be very high for these regions of the electromagnetic spectrum, where solar radiation is greatly reduced as a result of atmospheric absorption (i.e., the so-called Fraunhofer lines; Meroni and Colombo 2006)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
