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3 edition of Heat and water vapor flux in conifer forest litter and duff found in the catalog.

Heat and water vapor flux in conifer forest litter and duff

a theoretical model

by Michael A. Fosberg

  • 160 Want to read
  • 3 Currently reading

Published by Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture in Fort Collins, Colo .
Written in English

    Subjects:
  • Forest litter.

  • Edition Notes

    StatementMichael A. Fosberg.
    SeriesUSDA Forest Service research paper RM -- 152.
    The Physical Object
    Pagination23 p. :
    Number of Pages23
    ID Numbers
    Open LibraryOL15562761M

    On measuring and modeling energy fluxes above the floor of a homogeneous and heterogeneous conifer forest. Agricultural and Forest Meteorology. water vapor, and energy flux densities. Bulletin of the American Meteorological Society. 82(11) Energy partitioning between latent and sensible heat flux . The _____ Forest region is located along the Mississippi river. bottomland. The forest region with the most potential for meeting future needs for forest products is the _____ Forest region.


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Heat and water vapor flux in conifer forest litter and duff by Michael A. Fosberg Download PDF EPUB FB2

Fosberg, M. Heat and water vapor flux in conifer forest litter and duff: a theoretical model. Research Paper RM Fort Collins, CO, USDA Forest Service, Rocky Mountain Forest and.

Heat and water vapor flux in conifer forest litter and duff. Fort Collins, Colo.: Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, (OCoLC) Material Type: Government publication, National government publication: Document Type: Book.

The model was developed from numerical and analytical solutions of the diffusion forms of the mass continuity equation and the first law of thermodynamics. Analytical solutions provided a functional. Heat and water vapor flux in conifer forest litter and duff: a theoretical model / Michael A.

: Michael A. Fosberg. The influence of fuelbed properties on moisture drying rates and timelags of longleaf pine litter. Ralph M. Nelson, a b J Fosberg, M.A. Heat and water vapor flux in conifer forest litter and duff: a theoretical model.

Fosberg, M.A. Heat and water transport properties in conifer duff Cited by: The heat flux density beneath the forest litter is a small portion of the instantaneous stand energy balance.

Therefore, variation in it with proximity to the stand edge can be assumed negligible. Fosberg Cited by:   Fluxes of CO2, latent heat and sensible heat were measured above a fully-leafed deciduous forest in eastern Tennessee with the eddy correlation technique.

These are among the first reported observations over such a surface. The influences of solar radiation, vapor Cited by:   [2] The forest floor in many ecosystems consists of a partially decomposed organic layer (duff) up to 30 cm thick.

The duff, along with the litter layer, is the boundary between the atmosphere Cited by: In forest fuels, water is a latent heat sink that affects several aspects of combusti on, including preheating, pyrolysis, rate of spread, rate of energy release, and. A study of fuels of Siena Nevada conifer species showed that percent ash content, heat content with ash, and heat content without ash of needle and duff fuels significantly varied by species, fuel.

Easily ignited, and already burning, leaf litter may serve as the pilot ignition source for desiccating wood.

Scaling Vapor Plume Mass to Impactor and Crater Sizes [30] The previous calculations suggest that globally distributed vapor Cited by: This chapter begins with a review of the influence of moisture on the combustion of forest fuels and how fuel characteristics determine the moisture content level of these fuels.

It summarizes current understanding of the amount of water these fuels can hold, gain and loss of this water Cited by: RM-RP Heat and water vapor flux in conifer forest litter and duff: A theoretical model.

RM-RP Development of some young aspen stands in Arizona. RM-RP Provisional tree and shrub seed zones for the Great Plains. Vapor Pressure Deficit (VPD): Water stress causes partial to complete stomatal closure, reduces leaf development rate, induces the shedding of leaves, and slows or halts cell division.

Although models are available to calculate a soil water balance, they require knowledge of rooting depth, soil texture, latent heat. Duff layer. A layer of moderately to highly decomposed leaves, needles, fine twigs, and other organic material found between the mineral soil surface and litter layer of forest soil.

The duff layer is classified by degree of decomposition as upper duff and lower duff. Equivalent heat flux (W/m2) Energy over the hot gaseous column Multiplication of the nominal convection heat flux by the burning ratio Rb Water vapor mass flux (kg/m2/s) Multiplication of the nominal water.

–The fire releases heat, water vapor into the atmosphere. –This alters winds, pressure, humidity, etc. in the fire, in the fire plume, & in the fire environment –This in turn feeds back on the fire behavior.

• This. Even before the myth of Prometheus, fire played a crucial ecological role around the world. Numerous plant communities depend on fire to generate species diversity in both time and 3/5(1).

Verma SB, Baldocchi DD, Anderson DE et al () Eddy fluxes of CO 2, water vapor and sensible heat over a deciduous forest. Bound-Lay Meteorol –91 CrossRef Google Scholar Vourlitis GL, Priante N, Hayashi MMS et al () Seasonal variations in the net ecosystem CO 2 exchange of a mature Amazonian transitional tropical forest Cited by: Field measurement of ring porous tree transpiration by heat pulse velocity.

Vavrina and D. Miller, University of Connecticut, Storrs, Conn. Prediction of water vapor flux in conifer forest litter and duff. Fosberg, Rocky Mountain Forest. diameter along the entire m distance. Litter and duff depths (cm) were sampled at points 2, 5 and 8 m from the beginning of the sub-transect.

We did not measure the bulk density, but instead used equations quantifying relationships between depth and weight of litter and duff for common conifer. A thinner litter layer is also present in chaparral and thus the soil is not well insulated against heat radiated down- ward during a fire compared to the forest floor where a thick layer of duff and litter is.

Twelve-years of eddy-covariance measurements conducted above a boreal Scots pine forest in Hyytiälä, Southern Finland, were analyzed to assess the seasonal and inter-annual variability of surface conductance (gs) and energy partitioning. The gs had distinct annual course, driven by the seasonal cycle of the Scots pine.

Low gs ( mm s-1 in April) cause the sensible heat flux Cited by: Figure 1—Forest floor accumulations in a long-unburned longleaf pine stand in northern Florida. Forest floor duff is concentrated at tree bases. The composition of duff differs with distance from stem, consisting primarily of bark slough near the bole and becoming increasingly dominated by needle litter Cited by: 2.

HEAT RELEASE RATES OF BURNING ITEMS IN FIRES HYEONG-JIN KIM and DAVID G. LILLEY Lilley & Associates Route 1 Box Stillwater, OK 38th Aerospace Sciences Meeting & Exhibit File Size: 1MB. Benjamin N. Sulman, D. Tyler Roman, Todd M. Scanlon, Lixin Wang and Kimberly A. Novick, Comparing methods for partitioning a decade of carbon dioxide and water vapor fluxes in a temperate forest, Agricultural and Forest.

Here, Δm is the increase in leaf litter moisture content due to nocturnal condensation (%), w is the surface fuel mass (kg/m2), Qg is the soil heat flux (W/m2), Q* is the net all-wave radiation flux (W/m2), Lv is the latent heat of vaporisation or sublimation (J/kg), cp is the specific heat.

@article{osti_, title = {Trace gas exchange above the floor of a deciduous forest. Evaporation and CO sub 2 efflux}, author = {Baldocchi, D D and Meyers, T P}, abstractNote = {The eddy correlation method has great potential for directly measuring trace gas fluxes at the floor of a forest.

ground fuels. the fuels that lie below the litter layer of the soil, including organic soils, forest floor duff, dead roots, burned fuels. surface fuels. understory plants litter layer, downed woody.

@article{osti_, title = {Validation of coupled atmosphere-fire behavior models}, author = {Bossert, J E and Reisner, J M and Linn, R R and Winterkamp, J L and Schaub, R and Riggan, P J}, abstractNote = {Recent advances in numerical modeling and computer power have made it feasible to simulate the dynamical interaction and feedback between the heat.

Litter is the predominant fuel that drives surface fire behavior in most fire-prone forest and woodland ecosystems. The flammability of litter is driven by fuel characteristics, environmental factors, and the interactive effects of the two.

Solar radiation can influence litter. A wildfire, wildland fire or rural fire is an uncontrolled fire in an area of combustible vegetation occurring in rural areas. Depending on the type of vegetation present, a wildfire can also be classified more specifically as a brush fire, bushfire, desert fire, forest fire, grass fire, hill fire.

The decomposition rates of forest ‘mineral’ soil (excluding litter and metabolizable SOC) from 82 sites worldwide reveal little relationship with mean annual temperature (Giardina & Ryan.

Forest Service, British Columbia Department of Lands, Forest and Water Resources. Victoria, BC. 10 p. Daubenmire, R. Vegetation zones in the Rocky Mountains. Botany Review Daubenmire, R. Forest. One approach to increase community resilience to wildfire impacts is the enhancement of residential construction standards in an effort to provide protective shelters for families within their own homes.

Cited by: 1. Furfural is a skin, eye, and mucous membrane irritant. Although the vapor is a potent irritant, the liquid has a relatively low volatility so that inhalation of significant quantities by workers in unlikely. Exposure. Abert squirrels influence nutrient transfer through litterfall in a ponderosa pine forest Volume of Research note RM: Authors: T.

Skinner, James O. Klemmedson, Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.) Publisher: Rocky Mountain Forest and Range Experiment Station, Forest. If a heat flux boundary condition is used, net heat flux (incident flux minus outward-bound heat losses from the surface) must be calculated (e.g., Bova and Dickinson ).

Estimates of incident flux Cited by: Books. Journal Articles/Book Chapters. Bayesian multi-model estimation of global terrestrial latent heat flux from eddy covariance Prescribed burning and mechanical thinning effects on belowground conditions and soil respiration in a mixed-conifer forest, California.

Forest. The Cooney Ridge Fire Experiment conducted by fire scientists in was a burnout operation supported by a fire suppression crew on the active Cooney Ridge wildfire incident. The fire experiment included measurements of pre-fire fuels, active fire behavior, and immediate post-fire effects.

Heat flux Cited by: 5. ABSTRACT Sincetwelve scientists representing several research disciplines — systems ecology, soils, plant nutrition, forest ecology, forest pathology, wildlife ecology, air pollution technology, and meteorology — have collabo- rated in integrated studies to determine the chronic effects of photochem- ical oxidant air pollutants on a western mixed conifer forest .Figure 4—Diagram showing heat flux to the mineral soil where duff burning is the heat source.

When duff does not burn, it is a barrier to heat flow. The arrow represents the direction of spread for duff .The vegetation subsystem project is focused on describing: 1) plant communities within the mixed conifer forest type in the San Bernardino Mountains, and 2) the impact of oxidant air pollutant on .