We investigated leaf physiological traits of dominant canopy trees in four lowland Panamanian forests with contrasting mean annual precipitation (1,800, 2,300, 3,100 and 3,500 mm). There was near complete turn-over of dominant canopy tree species among sites, resulting in greater dominance of evergreen species with long-lived leaves as precipitation increased. Mean structural and physiological ...

In summer 1992, isoprene emission was measured on intact leaves and branches of Quercus alba (L.) at two heights in a forest canopy. Isoprene emission capacity (measured at 30 degrees C and a photosynthetic photon flux density of 1000 micro mol m(-2) s(-1)) was significantly higher in sun leaves than in shade leaves when expressed on a leaf area basis (51 versus 31 nmol m(-2) s(-1); P < 0.01). ...

The distribution of Acacia dealbata Link (Fabaceae) in its non-native range is associated with disturbed areas. However, the possibility that it can penetrate the native forest during the invasion process cannot be ruled out. This statement is supported by the fact that this species has been experimentally established successfully under the canopy of native forest. Nonetheless, it is unknown wh...

abstract in order to study the effects of irrigation regimes on physiological traits, yield and water use efficiency of potato (solanum tuberosum l.) in mashhad weather condition, an experiment was conducted in 2009 at research field of the college of agriculture, ferdowsi university of mashhad, using factorial experiment based on randomized complete blocks design with 3 replications. experimen...

Fire-induced turbulence and the feedback into fire, following ambient changes, differ for forested (sub-canopy) grassland environments. Here, we synthesize observations from multiple experimental surface fires: two sub-canopy backing fires, one heading a fire. We identify compare most essential coherent structures processes of each case turbulent momentum fluxes kinetic energy (TKE) budget term...

Impervious area increase by urbanization and flash flood climate change lead to abrupt in urban stormwater, unlike the past. Currently, street trees play a significant role environmental improvement such as green space, heat reduction, air pollution reduction. In addition, transpiration from leaf canopy an water cycle significantly impacts decrease stormwater runoff. this study, canopy, earlier...

The testable implication of the complete risk-sharing hypothesis depends on what is assumed on households' relative risk aversion (RRA) coefficient. We therefore use a hyperbolic absolute risk aversion (HARA) utility function, which includes increasing, constant, and decreasing RRA as special cases, to test this hypothesis. Using household level total non-durable consumption data from Indian vi...

Citation Nepf, H. et al. " Retention time and dispersion associated with submerged aquatic canopies. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. [1] The shear ...

Stably stratified canopy flow in complex terrain has been considered a difficult condition for measuring net ecosystem–atmosphere exchanges of carbon, water vapor, and energy. A long-standing advection error in eddy-flux measurements is caused by stably stratified canopy flow. Such a condition with strong thermal gradient and less turbulent air is also difficult for modeling. To understand the ...

Several decades of research have shown that canopy gaps drive tree renewal processes in the temperate deciduous forest biome. In the literature, canopy gaps are usually defined as canopy openings that are created by partial or total tree death of one or more canopy trees. In this study, we investigate linkages between tree damage mechanisms and the formation or not of new canopy gaps in norther...