Diffuse solar radiation and canopy photosynthesis in a changing environment

0548107 - ÚVGZ 2022 RIV NL eng J - Journal Article
Durand, M. - Murchie, E. H. - Lindfors, A. - Urban, Otmar - Aphalo, P. J. - Robson, T. M.
Diffuse solar radiation and canopy photosynthesis in a changing environment.
Agricultural and Forest Meteorology. Roč. 311, OCT (2021), č. článku 108684. ISSN 0168-1923. E-ISSN 1873-2240
R&D Projects: GA MŠMT(CZ) EF16_019/0000797
Research Infrastructure: CzeCOS III - 90123
Institutional support: RVO:86652079
Keywords : gross primary productivity * net ecosystem exchange * aerosol optical-properties * biomass burning aerosols * carbon-dioxide exchange * water-vapor exchange * elevated co2 * climate-change * atmospheric particles * nitrogen distribution * Diffuse radiation * Aerosols * Clouds * Climate change * Spectral composition * Photosynthesis
OECD category: Climatic research
Impact factor: 6.424, year: 2021
Method of publishing: Open access
https://www.sciencedirect.com/science/article/pii/S0168192321003701?via%3Dihub

The sunlight received by plants is affected by cloudiness and pollution. Future changes in cloud cover will differ among regions, while aerosol concentrations are expected to continue increasing globally as a result of wildfires, fossil fuel combustion, and industrial pollution. Clouds and aerosols increase the diffuse fraction and modify the spectral composition of incident solar radiation, and both will affect photosynthesis and terrestrial ecosystem productivity. Thus, an assessment of how canopy and leaf level processes respond to these changes is needed as part of accurately forecasting future global carbon assimilation. To review these processes and their implications,first, we discuss the physical basis of the effect of clouds and aerosols on solar radiation as it penetrates the atmosphere second, we consider how direct and diffuse radiation are absorbed and transmitted by plant canopies and their leaves and finally, we assess the consequences for photosynthesis at the canopy and ecosystem levels. Photobiology will be affected at the atmospheric level by a shift in spectral composition toward shorter or longer wavelengths under clouds or aerosols, respectively, due to different scattering. Changes in the microclimate and spectral composition of radiation due to an enhanced diffuse fraction also depend on the acclimation of canopy architectural and physiological traits, such as leaf area index, orientation, and clumping. Together with an enhancement of light-use efficiency, this makes the effect of diffuse solar radiation on canopy photosynthesis a multilayered phenomenon, requiring experimental testing to capture those complex interactions that will determine whether it produces the persistent enhancement in carbon assimilation that land-surface models currently predict.
Permanent Link: http://hdl.handle.net/11104/0324226