The efficiency with which incoming photosynthetically active radiation (PAR) is intercepted by a canopy depends on the proportions of diffuse and direct radiation in the incoming PAR. In the present work, we developed a comparison between two spectral cloudless sky parameterization schemes in terms of their capability to provide accurate estimates of global, diffuse and direct incoming PAR. Bot...

We examined the effects of structural and physiological acclimation on the photosynthetic efficiency of Scots pine (Pinus sylvestris L.) shoots. We estimated daily light interception (DLI) and photosynthesis (DPHOT) of a number of sample shoots situated at different positions in the canopy. Photosynthetic efficiency (epsilon) was defined as the ratio of DPHOT to the potential daily light interc...

The partitioning of light is very difficult to assess, especially in discontinuous or irregular canopies. The aim of the present study was to analyze the spatial distribution of photosynthetically active radiation (PAR) in a heterogeneous cotton canopy based on a geo-statistical sampling method. Field experiments were conducted in 2011 and 2012 in Anyang, Henan, China. Field plots were arranged...

Brown band syndrome is a new coral affliction characterized by a local accumulation of yet-unidentified ciliates migrating as a band along the branches of coral colonies. In the current study, morphologically intact zooxanthellae (= Symbiodinium) were observed in great numbers inside the ciliates (>50 dinoflagellates per ciliate). Microscale oxygen measurements and variable chlorophyll a fluore...

Decision support systems (DSS) are needed to carry out precision irrigation. Key issues in this regard include how deal with spatial variability and the adoption of deficit irrigation strategies at field scale. A software application originally designed for water balance-based automated scheduling locally fine-tuned through use sensors has been further developed emerging paradigm both digital t...

Leaf shapes of cotton (Gossypium hirsutum) range from highly divided leaves (okra leaf) to normal leaf shape (Meredith, 1 ). The variation in leaf shape results in differences in canopy architecture and light interception characteristics (Wells and Meredith, 1 ). Heitholt et al. (1 ) described higher yields of okra leaf isolines for a given amount of intercepted radiation, indicating that the o...

The distribution of light in the canopy is a major factor regulating the growth and development of a plant. Consequently, simulation of light environment is an important component of functionalstructural plant modelling. The main variables of interest are the quantity of photosynthetically active radiation (PAR) reaching different elements of the plant canopy, and the quality (spectral composit...

Incident photosynthetically active radiation (PAR) is required by almost all terrestrial ecosystem models and many other applications. The current PAR products that are developed for climate studies have much coarser spatial resolution and higher temporal resolution and are not suitable for land applications. This article reviews stateof-the-art methods for mapping land spatial-resolution incid...

Using MODIS data, the present study analyzed spatial distributions and annual variability of Bio-Geochemical concentrations from 2011 to 2020 in Northern Indian Ocean. The observed significant variations parameters such as PAR (Photosynthetically Active Radiation), SST (Sea Surface Temperature), Chlorophyll. Annual composite images MODIS-Aqua derived Chlorophyll & SST, POC were retrieved 2020, ...