نتایج جستجو برای: cr production systems on canopy closure
تعداد نتایج: 9227740 فیلتر نتایج به سال:
Satellite remote sensing provides a rapid and broad-scale means for monitoring vegetation phenology and its relationship with fluctuations in air temperature. Investigating the response of plant communities to climate change is needed to gain insight into the potentially detrimental effects on ecosystem processes. While many studies have used satellite-derived land surface temperature (LST) as ...
In this study, the Weather Research and Forecasting (WRF) model is coupled with the Advanced Canopy– Atmosphere–Soil Algorithm (ACASA), a high-complexity land surface model. Although WRF is a state-of-the-art regional atmospheric model with high spatial and temporal resolutions, the land surface schemes available in WRF, such as the popular NOAH model, are simple and lack the capability of repr...
Reductions in cellular oxygen consumption (Vo2) and reactive oxygen species (ROS) production have been proposed as mechanisms underlying the anti-aging effects of calorie restriction (CR). Mitochondria are a cell's greatest "sink" for oxygen and also its primary source of ROS. The mitochondrial proton leak pathway is responsible for 20-30% of Vo2 in resting cells. We hypothesized that CR leads ...
The effect on herbaceous production of blue oak canopies of 25, 50, and 75 percent, and the effect of complete removal of such canopies were determined over a 7-year period for a single site in the foothills of the northern Sierra Nevada. Tree covered plots produced 12 percent less than open grassland plots, while cleared plots produced 46 percent more than tree covered plots. Percentage differ...
In preparation for new satellite sensors, such as VEGEciated with vegetation, and as an input to ecosystem proTATION on SPOT-4 and the MODerate Resolution Imductivity models (Sellers et al., 1986; Bonan, 1993; Liu aging Spectrometer (MODIS), we investigate the potenet al., 1997). The need for LAI information over large tial of the shortwave infrared (SWIR) signal to improve areas has prompted i...
[1] Estimating transpiration and water flow in trees remains a major challenge for quantifying water exchange between the biosphere and the atmosphere. We develop a finite element tree crown hydrodynamics (FETCH) model that uses porous media equations for water flow in an explicit three-dimensional branching fractal tree-crown system. It also incorporates a first-order canopy-air turbulence clo...
The forest canopy is the functional interface between 90% of Earth's terrestrial biomass and the atmosphere. Multidisciplinary research in the canopy has expanded concepts of global species richness, physiological processes, and the provision of ecosystem services. Trees respond in a species-specific manner to elevated carbon dioxide levels, while climate change threatens plant-animal interacti...
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