Estimating transpiration as an individual component of canopy evapotranspiration using a theoretical approach is extremely useful it eliminates the complexity involved in partitioning evapotranspiration. A model to predict based on radiation intercepted at various levels leaf area index (LAI) was developed controlled environment pasture species, tall fescue (Festuca arundinacea var. Demeter). T...

Absorption of radiation in the photosynthetically active (PAR) region is significantly influenced by plant biochemistry, structural properties, and photosynthetic pathway. To understand quantify effects these traits on absorbed PAR it necessary to develop practical reliable tools that are sensitive traits. Using a semi-analytical modeling framework for deriving absorption coefficient canopies f...

Abstract. Surface downward shortwave radiation (DSR) and photosynthetically active (PAR) play critical roles in the Earth's surface processes. As main inputs of various ecological, hydrological, carbon, solar photovoltaic models, increasing requirements for high-spatiotemporal-resolution DSR PAR estimation with high accuracy have been observed recent years. However, few existing products satisf...

Mature potato (Solanum tuberosum L. cv. Kennebec) canopies are composed of leaves originating frommainand axillary-stem branches. Canopy leaf distribution and its corresponding contribution to wholecanopy photosynthetic rates have not been quantified. An experiment using SPAR (Soil–Plant–Atmosphere–Research) chambers maintained at 16-h day/night thermoperiods of 14/10, 17/12, 20/15, 23/18, 28/2...

Ultraviolet-B radiation is an important component of the environment, acting as an ecophysiological factor with the potential to alter plant growth and photosynthesis. Plant response to UV-B is effectively regulated by photo protective mechanisms that dissipate excess radiation. At the morphological & physiological level these photo repair mechanisms and antioxidant responses mop up reactive ox...

In open places, plants are exposed to higher fluence rates of photosynthetically active radiation and to higher red to far-red ratios than under the shade of neighbor plants. High fluence rates are known to increase stomata density. Here we show that high, compared to low, red to far-red ratios also increase stomata density in Arabidopsis (Arabidopsis thaliana). High red to far-red ratios incre...

A simple model that describes growth in terms of physical and physiological processes is needed to predict growth rates and hence the productivity of trees at particular sites. The linear relationship expected between absorbed photosynthetically active radiation (phi(pa), MJ m(-2)) and dry mass production (G(t)); i.e., G(t) = epsilonphi(pa), where epsilon is the radiation utilization coefficien...