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Topic: Vegetation Structure

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	Vegetation - Wikipedia, the free encyclopedia
		Vegetation is a general term for the plant life of an area; it refers to the ground cover provided by plants, and is by far the most abundant biotic element of the biosphere.
		Vegetation is also critically important to the world economy, particularly in the use of fossil fuels as an energy source, but also in the global production of food and other materials.
		An example of a vegetation type defined at the level of class might be "Forest, canopy cover > 60%", at the level of a formation as "Winter-rain, broad-leaved, evergreen, scleophyllous, closed-canopy forest", at the level of alliance as "Arbutus menziesii forest" and at the level of association as "Arbutus menziesii-Lithocarpus densiflora forest".
	en.wikipedia.org /wiki/Vegetation (559 words)

	USGS - NPS Vegetation Mapping Program: Final Draft, Standardized National Vegetation Classification System, November ...
		For vegetation classification, the unit of observation is typically the "stand," defined as a relatively homogeneous area with respect to species composition, structure, and function.
		Broadly speaking, physiognomy refers to structure (height and spacing of the vegetation) and life forms of the dominant species (the gross morphology and growth aspect of the plants).
		Relationships between vegetation and the soils or landform factors are established during and after the classification process, but these factors are not used to define the vegetation units (Komarkova 1983).
	biology.usgs.gov /npsveg/classification/sect3.html (3475 words)

	Grasshoppers: Their Biology, Identification and Management: HANDBOOK - IV.3 Grasshoppers and Vegetation Communities
		Vegetation communities provide the backdrop against which all grasshopper activities occur and determine the availability and distribution of all resources required by grasshoppers.
		Vegetation structure and topography interact with regional weather to determine the “microclimatic resources” that grasshoppers encounter for thermoregulation.
		Daubenmire, R. Forest vegetation of northern Idaho and adjacent Washington, and its bearing on the concepts of vegetation classification.
	www.sidney.ars.usda.gov /grasshopper/Handbook/IV/iv_3.htm (4105 words)

	Vegetation Structure
		These are the factors that form the basis of scientific descriptions of the vegetation structure.
		Flowers and fruits which arise directly from the main trunk or branches are thought to be beneficial for pollination and dispersal of seeds by animals, in as environment where dispersal by wind is not common.
		The total vegetation density of the forest including trees, shrubs and seedlings has been estimated to be around 240,000 individuals per hectare, of which 95% comprises individuals of the ground layer.
	www.sinharaja.4t.com /pages/vegetation_structure.htm (854 words)

	Pirjo Welling. Regeneration by seeds and vegetation structure in alpine plant communities, subarctic Finland. ISBN ...
		The aims were to examine the importance of regeneration by seeds, the influence of plant traits and disturbances, and the role of seed-seedling conflicts in regeneration and in the determination of vegetation structure.
		Vegetative reproduction and infrequent pulses of seedling recruitment negate an influence of short-term seedling recruitment on the spatial structure of vegetation.
		In heath vegetation, where bare soils are dry and the moss cover is thick, large seed banks and seed rains do not guarantee effective seedling recruitment.
	herkules.oulu.fi /isbn951426861X?tulosta=yes (471 words)

	BASIS+ Tools: Simple Search (Site not responding. Last check: 2007-11-04)
		Vegetation Survey Different survey methods will be used to measure areas of primarily herbaceous vegetation and those of woody plants greater that one inch dbh.
		A summer survey for herbaceous vegetation and associated woody species less than one meter in height (or less than one inch dbh) will be conducted for field areas using 1- meter wide belt transects running perpendicular to the center-line trail where such vegetation type exists.
		Vegetation will be measured during the summer using belt transects for fields and 20 X 30 meter plots for woody plants.
	www.pwrc.usgs.gov /brd/BasisSimpleSearch.cfm?PTS=23139IM.32.0&Show=Logo,PTS,Title,Keywords,Leaders,Narrative,Product (1002 words)

	Forest and Rangeland Birds of the United States (Site not responding. Last check: 2007-11-04)
		MacArthur and MacArthur (1961) demonstrated that the vertical complexity of forest vegetation (the diversity of vegetation heights and density of foliage at those heights) affects breeding bird diversity.
		Both the vertical diversity or structure of forest stands and the distribution of stands of different size class or type are typically manipulated in forest management and can be altered as needed to manage the type and availability of bird habitat.
		The close relationship between habitat structure and bird species composition is useful for assessing the effects of forest management on breeding birds.
	www.npwrc.usgs.gov /resource/1998/forest/vege.htm (777 words)

	VEGETATION STRUCTURE (Site not responding. Last check: 2007-11-04)
		The structure of vegetation defines potential LAI and in turn, is determined by moisture balance and PAR.
		At the same time, vegetation structure defines surface roughness potential (see Surface Roughness) and as such is a required component for development of climate and hydrological cycle models.
		Above-ground and below-ground biomass, NEP, necromass, vegetation roughness.
	www.wmo.ch /web/gcos/terre/variable/vegeta.html (238 words)

	Vegetation Structure - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-11-04)
		A GEOGRAPHIC STUDY OF THE VEGETATION STRUCTURE OF BACHMAN'S SPARROW (AIMOPHILA AESTIVALIS) BREEDING HABITAT.
		The structure and composition of vegetation in the lake-fill Peatlands of Indiana.(Statistical Data Included) : An article from: Proceedings of the Indiana Academy of Science
		The Relationship Between Patterns in Flying Adult Insect Assemblages and Vegetation Structure in Wetlands of Ohio and Texas(1).(Statistical Data Included)...
	encyclopedia.worldsearch.com /vegetation_structure.htm (219 words)

	Assignment: Indirect gradient analysis
		Structure and composition of Goll Woods, an old-growth forest remnant in northwestern Ohio.
		High-Andean vegetation and environmental gradients in northwestern Patagonia, Argentina.
		Variation in the composition and structure of tropical savannas as a funciton of rainfall and soil texture along a large-scale climatic gradient in the North Territory, Australia.
	botanycourses.okstate.edu /palmer/bot5533/indirect.html (6873 words)

	Vegetation Zones of Nevada by D. Charlet (Site not responding. Last check: 2007-11-04)
		Structurally, these communities are various mixtures of short-shrubs, perennial herbs, and graminoids.
		The structure of the communities is usually simple, varying mainly in short-shrub cover compared to that contributed by perennial herbs and graminoids.
		Structurally, the Lower Mojavean Zone is similar to the Blackbrush Zone in that it is usually a multi-layered, thorny shrub community.
	www.brrc.unr.edu /mtn/html/ref/daczone.html (4721 words)

	General Discussion
		vegetation structure dynamic may be typical for mangroves that are characterised by an irregular topography instead of the frequently encountered intertidal slope.
		Therefore ‘vegetation structure’ is limited to the extent and fragmentation of the few mangrove populations left and to their physiognomy.
		In the study of vegetation structure, its establishment and its dynamics, the answer to this question may be very valuable.
	www.vub.ac.be /APNA/staff/FDG/PhD/discussion.html (4162 words)

	The Vegetation Canopy Lidar Mission: Mission Paper (Site not responding. Last check: 2007-11-04)
		The principle goal of VCL is the characterization of the three-dimensional structure of the earth: in particular, canopy vertical and horizontal structure and land surface topography.
		The priniciple goal of the Vegetation Canopy Lidar is the characterization of the three-dimensional structure of the earth: in particular, canopy vertical and horizontal structure and land surface topography.
		Similarly, for biogeochemical modeling, biotic erosion, and land degradation, the vegetation component of landcover must be represented in structural terms (biomass) and by composition (annual/perennial, woody/non-woody, and their age structures).
	www.geog.umd.edu /vcl/vcltext.html (4846 words)

	GTOS :: TEMS database (Site not responding. Last check: 2007-11-04)
		For further classification, the following growth form criteria are used: duration of the vegetation, branching symmetry of woody plants (trees or shrubs), and physiognomy (gramnoids or non-gramnoids).
		Vegetation structure is effected by the moisture balance and PAR.
		Finally, vegetation structure is closely correlated with potential and realised biomass above ground and, to some degree, biomass below ground.
	www.fao.org /gtos/tems/variable_show.jsp?VARIABLE_ID=24 (284 words)

	Bird Explanation
		And, perhaps most importantly, which technical measure of vegetation structure is the best predictor of the number of bird species in a forest.
		To understand the measurements of vegetation structure, you'll need the concept of a forest's vegetation density at a particular height.
		The units, however, are not typical area units, as vegetation density is the reciprocal of a distance; the units are specially designed to measure profile area, and are called f.p.
	www.stat.ucla.edu /projects/datasets/bird-explanation.html (756 words)

	Environmental Weeds Action Network (EWAN)
		Vegetation Condition maps provide a picture of how different degrees of disturbance are distributed throughout a particular bushland site and they are a useful tool for developing management strategies.
		However, mapping of vegetation condition requires an understanding of the effects different types of disturbance may have on bushland, a knowledge of native flora and familiarity and understanding of what a particular undisturbed plant community would be like.
		The structure of the vegetation is no longer intact and the area is completely or almost completely without native species.
	members.iinet.net.au /~ewan/maps11.htm (308 words)

	[No title] (Site not responding. Last check: 2007-11-04)
		The historic vegetation of Bryce Canyon was reconstructed from relocated historic photographs and vegetation age-structure analysis and includes a vegetation gradient from sagebrush and pinyon-juniper woodlands to mixed-conifer forests, with estimated wildfire return intervals from a few decades to centuries.
		The flora and vegetation of Bryce Canyon National Park are described in detail by Buchanan (1960), Graybosch and Buchanan 1983, Hallsten and Roberts (1988), and Roberts, Wight and Hallsten (1988).
		The composition and structure of southwestern forest vegetation is generally very sensitive to the prevailing disturbance regime (Cooper 1960, Weaver 1967, 1974, Kilgore 1981, Covington and Moore 1992, 1994a, 1994b), and modified fire regimes had been proposed as responsible for changes in forest age-class distributions and composition in Bryce Canyon National Park (Stein 1988a, 1988b).
	www.nr.usu.edu /~dvrbts/landsim/landsim3.html (7973 words)

	The Precision Forestry Cooperative at the University of Washington
		It is the first of its kind ever collected over a large area in the United States and offers the opportunity to develop pre-fire vegetation structure, density, and biomass measurements and maps at unprecedented resolution (1-3 meters), and for the first time, with direct measurement of vertical vegetation structure.
		Second, as each year passes, the unburned vegetation structure will continue to change in areas where ground plots are to be installed, thus making it more difficult to develop relationships with the existing IFSAR dataset that was collected in winter 2002-2003.
		Vegetation characteristics and underlying topography from interferometric radar.
	www.cfr.washington.edu /research.pfc/research/socal (4064 words)

	Vegetation structure - Wikipedia, the free encyclopedia
		A Vegetation structure or a Vegetation Community Structure is ___ that consists of four main components.
		Layers and Tiers, layers of growth between different types and heights of vegetation.
		Dominant Species, the species with the dominant influence in the vegetation community.
	en.wikipedia.org /wiki/Vegetation_Structure (144 words)

	Vegetation structure and species composition a (Site not responding. Last check: 2007-11-04)
		The vegetation height disc is a 60cm diameter lightweight plyboard disc that is used to estimate vegetation height.
		The purpose of the disc as opposed to a ruler is that the wooden disc averages out several heights.
		Again vegetation height is measured every time some form of manual defoliation occurs.
	web.uct.ac.za /depts/botany/zlgp/vegetation_structure_and_species.htm (264 words)

	ETM+LIFE Introduction (Site not responding. Last check: 2007-11-04)
		Such a model could be based on ground-observed vegetation in relation to environmental data, and use remote sensing (e.g., Landsat) to help identify broad--but actual--assemblages of vegetation species (e.g., hardwood vs. conifer).
		More detailed structural information from closed canopies is only possible when there are associated changes in the horizontal dimension (both within and among pixels), such as varying proportions of tree and shadow with changing tree density (Cohen et al.
		The first generation lidar sensors for vegetation studies were designed to record distance to the first reflective surface intercepted by a laser pulse over a relatively small sampling area, or footprint, approximately 1 m in diameter (Arp et al.
	www.fsl.orst.edu /~lefsky/etmlife/etmlife_intro2.html (2170 words)

	Vegetation-Lidar Related Resources
		Stepwise multiple regerssion was performed to predict the two stand structure attributes using the canopy height profile data directly as independent variables, but they did not improve the accuracy of the estimates over the height index approach.
		Furthermore, we were able to make accurate estimates of other stand structure attributes, including the mean and standard deviation of diameter at breast height, the number of stems greater than 100 cm in diameter, and independent estmates of the basal area of Douglas-fir and western hemlock.
		The four stands were selected so as to include a range of canopy structures of importance to forest ecosystem function, including variation in the height and roughness of the outer-most canopy surface and the vertical organization of canopy stories and gaps.
	denali.gsfc.nasa.gov /icesat/pub_v.html (1569 words)

	[No title]
		Dispersal abilities and genetic population structure of insular and mainland Oryzomys palustris and Peromyscus leucopus.
		Vegetation of headwater wetlands in the inner coastal plain of Virginia and Maryland.
		The role of submerged aquatic vegetation in influencing the abundance of nekton on contiguous tidal freshwater marshes.
	www.vcrlter.virginia.edu /publications/VCRLTER_ecology_style.txt (8322 words)

	Tracked vehicle impacts to vegetation structure and soil erodibility by William P. Grantham, Edward F. Redente, Calvin ... (Site not responding. Last check: 2007-11-04)
		Vegetation structure has been shown to play a role in soil surface stabilization by reducing shear stress caused by wind force.
		Results indicated that significant damage occurred to vertical vegetation structure as the number of passes increased.
		Results indicated that the decrease of vertical vegetation structure led to a decrease in threshold wind speed.
	uvalde.tamu.edu /jrm/nov01/GRANTHAM.HTM (370 words)

	Vegetation structure and species cover
		Data from this subprogram constitutes a basis for description of the species, structure and community diversity of the site and its dynamics.
		The structure and dominance relations of all layers are relevant with respect to interception of precipitation and circulation of nutrients.
		On the plots are noted trees, shrubs, other vascular plnats, mosses and lichens in four layers, namely tree layer (trees >5 m), shrub layer (trees 1-5 m, shrubs > 1m), field layer (trees and shrubs < 1 m, other vascular plants) and bottom layer (bryophytes and lichens).
	www.ma.slu.se /IM/programme/VS.html (228 words)

	Lidar Remote Sensing for Ecosystem Studies (Site not responding. Last check: 2007-11-04)
		Prediction of forest stand structure using discrete return lidar had its start in the work of Maclean and Krabill (1986), who adapted a photogrammetric technique—the canopy profile cross-sectional area—to the interpretation of lidar data.
		Stepwise multiple regressions were performed to predict ground-based measures of stand structure from both conventional canopy structure indices (mean and maximum canopy surface height, canopy cover, etc.) and CVM indices such as filled canopy volume, open and closed gap volume, and a canopy diversity index—the average number of CVM classes per unit height.
		Indices of structural complexity also may be able to identify areas of probable high biodiversity, which could then be used to assist projects such as the national Gap Analysis Program (GAP; Scott and Jennings 1998).
	www.fsl.orst.edu /~lefsky/biosci (6875 words)

	[No title]
		Population structure, stand-level dieback and recovery of Scalesia pedunculata forest in the Gal pagos Islands.
		Vegetation of the wet windward slope of Mt. Haleakal
		Vegetation ecology of the Pacific Islands: a Symposium in Honor of F. Raymond Fosberg.
	www.botany.hawaii.edu /faculty/md/default.htm (3592 words)

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