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71 results for “vegetation survey”
Indian Peaks Vegetation Survey, 2013.
The purpose of this project was to determine the environmental variables most likely to differentiate alpine plant communities, assess whether they were the same within and across regions, and to explore the relative importance of environmental difference and geographic distance in the differentiation of communities. We hoped that the analyses might allow inference about the range of responses of these communities to climate change. We examine the broad climatic versus the local environmental factors that affect the assemblage of plant communities. We initially intended to resample some of the plots described by Komarkova based on the point map included in her dissertation, but the places we visited using the coordinates digitized from her map were not similar to her site descriptions, so an alternate method of site selection was used (see methods for details).
Figure 10 in Vegetation survey of the Khomas Hochland in central-western Namibia: syntaxonomical descriptions
Figure 10 (continued). Box-and-Whisker plots of the typical structure of the associations of the Khomas Hochland Proper, based on the relevé data. G, Schmidtio kalahariensis–Vachellietum eriolobae; H, Stipagrostis uniplumis–Senegalia detinens association; I, Stipagrostis uniplumis–Senegalia detinens typical sub-association; J, Stipagrostis uniplumis–Senegalia detinens tarchonanthus camphoratus sub-association; K, Stipagrostis uniplumis–Senegalia detinens vachellia tortilis sub-association; L, Stipagrostis uniplumis–Senegalia detinens vachellia reficiens sub-association.
Figure 7 in Vegetation survey of the Khomas Hochland in central-western Namibia: syntaxonomical descriptions
Figure 7. Typical views of the associations of the Khomas Hochland Proper. A, Digitario erianthae–Euryopietum walterorum, relevé 1837; B, Examples of rock faces hosting the Pennisetum foermerianum–Ficus ilicina association, here at Midgard; C, Danthoniopio ramosae–Oleoetum africanae on top of the Auas Mountains; D, Senegalio hereroensis–Tarchonanthoetum camphorati, relevé 1123; E, Triraphio ramosissimae–Manule opsietum dinteri, relevé 1011; F, Ornithoglosso calcicolae–Fin gerhuthioetum africanae, relevé 1095; G, Brachiario nigropedatae–Senegalietum hereroensis, relevé 1003. Photos: C by Dr Antje Burke, remainder by the author.
Figure 1 in Vegetation survey of the Khomas Hochland in central-western Namibia: syntaxonomical descriptions
Figure 1. The study area in western central Namibia. Mean Annual Rainfall is indicated as blue isohyets. Data source: NARIS (2001).
Figure 9 in Vegetation survey of the Khomas Hochland in central-western Namibia: syntaxonomical descriptions
Figure 9. Typical views of the associations of the riverine habitats within the Khomas Hochland. A, Eragrostio rotiferi–Oleoetum africanae, relevé 11525; B, Cynodo dactylonis–Eragrostioetum rotiferi, relevé 11520; C, Stipagrostioetum namaquensis, relevé 973; D, Themedio triandrae–Chloroetum virgatae, relevé 939; E, Chloro virgatae–Vachellietum karroo, relevé 11519; F, Salvadoro persicae–Eucleetum pseudebeno, relevé 929; G, Setario finitae–Vachellietum eriolobae, relevé 11488.
Figure 5 in Vegetation survey of the Khomas Hochland in central-western Namibia: syntaxonomical descriptions
Figure 5. Typical views of the associations of the Pre-Namib and Escarpment zone. A, Enneapogono desvauxii–Adenoloboetum pechuelii, relevé 2065; B, Enneapogono desvauxii–Eragrosti etum nindensis, relevé 9439; C, Crotalario podocarpae–Sti pagrostioetum obtusae, relevé 1997; D, Tribulocarpo dimorphantho–Vachellietum eriolobae, relevé 2013; E, Geigerio acaulis–Commiphoroetum glaucescentis, relevé 9467; F, Myrothamno flabellifolii–Commiphoroetum dinteri, relevé 1969; G, Eragrostio nindensis–Vachellietum reficientis, relevé 1970. Photos by the author.
Figure 4 in Vegetation survey of the Khomas Hochland in central-western Namibia: syntaxonomical descriptions
Figure 4. Box-and-Whisker plots of the typical structure of the associations of the Pre-Namib and Escarpment zone, based on the relevé data. A, Enneapogono desvauxii–Adenoloboe tum pechuelii; B, Enneapogono desvauxii–Eragrostietum nindensis; C, Crotalario podocarpae–Stipagrostioetum obtusae; D, Tribulocarpo dimorphantho–Vachellietum eriolobae; E, Geigerio acaulis–Commiphoroetum glaucescentis; F, Myrothamno flabellifolii–Commiphoroetum dinteri; G, Eragrostio nindensis–Vachellietum reficientis.
Figure 10 in Vegetation survey of the Khomas Hochland in central-western Namibia: syntaxonomical descriptions
Figure 10. Box-and-Whisker plots of the typical structure of the associations of the Khomas Hochland Proper, based on the relevé data. A, Pseudogaltonio clavatae–Eriocephaloetum luederitziana; B, Panico lanipedis–Pentzietum incanae; C, Aptosimo spinescentis–Galenietum africanae; D, Panico arbusculi–Senegalietum detinentis; E, Elephantorrhizo suffruticosae–Euphorbietum guerichianae; F, Dichrostachyo cinereae–Senegalietum erubescentis.
Egnuck Wida grassland vegetation survey (Kootenay Plains Ecological Reserve)
<p>Vegetation Survey of Egnuck Wida and the Kootenay Plains Ecological Reserve, Jul-Aug 2020, Alberta, Canada.</p> <p>For project details, see <br>Schepens et al. (2024). Colonial management drives ecological change following the exclusion of Indigenous stewardship in a Stoney Iyethka montane grassland, Canadian Rocky Mountains. (In press, People and Nature). </p> <p>and </p> <p>Schepens, G. (2022). <em>Ecological legacies of Stoney Nakoda stewardship in a montane grassland: a century of vegetation change in Egnuck Wida and the Kootenay Plains Ecological Reserve. </em>MSc Thesis, University of Victoria. https://dspace.library.uvic.ca/server/api/core/bitstreams/87a2642e-4fc6-4bd9-917e-77599fdd6ed0/content</p>
Supplementary material to: Dengler, J., Jansen., F., … & Gillet, F. (2023) Ecological Indicator Values for Europe (EIVE) 1.0. Vegetation Classification and Survey.
<p>The newly developed Ecological Indicator Values for Europe (EIVE) 1.0, together with all source systems in a flexible, harmonised open access database.</p> <p><br> Supplementary material 2: The analysed 31 EIV systems with original and harmonised plant nomenclature and original and rescaled indicator values for M, N, R, L and T (*.xlsx).</p> <p>Supplementary material 3: Documentation of additions to and modifications of the taxonomic backbone from Euro+Med (2022) in EIVE 1.0 (*.xslx).</p> <p>Supplementary material 8: EIVE 1.0 indicator values for niche position and niche width of M, N, R, L and T (*.xlsx).</p>
United States Pacific Northwest surveys of coastal foredune topography and vegetation abundance, 2012-2014
These datasets document our measurements of dune plant species abundance and topography from paired vegetation and topographic cross-shore foredune surveys in the United States Pacific Northwest (Oregon and southern Washington coastlines) in Summer 2012 and Summer 2014. In 2012, we conducted cross-shore paired topographic and vegetation surveys at 126 transect locations, and performed three replicate cross-shore transects per location (for a total of 378 transects). Of these surveys, 58 transect locations were positioned within Habitat Restoration Areas (as described in Biel et al. 2017). In 2014, we repeated these topographic and vegetation surveys at 83 of the 2012 transect locations (performing a single transect survey per location). Within each transect, we measure elevation (using RTK GPS) and plant species abundance (using 0.25 m^2 quadrats) at 5 m intervals between the vegetation line and the foredune heel. Within each quadrat, we measure the percent cover of all plant species present, and the tiller abundance of the three dune building grasses, Ammophila arenaria (invasive), Ammophila breviligulata (invasive), and Elymus mollis (native). Together, these datasets encompass measurements of elevation and plant abundance from 7953 quadrats in 2012, and 1616 quadrats in 2014.
GPS coordinates and vegetation descriptions for the ITEX circumarctic flux survey plots 2003-2009
GPS locations and vegetation descriptions for the ITEX flux survey plots. Survey plots were located in the Toolik Lake LTER fertilization experiment in Alaska; at Imnavait Creek, Alaska; at Paddus, Latnjajaure and the Stepps site near Abisko in northern Sweden; at various sites in Adventdalen, Svalbard; in the Zackenberg valley, Northeast Greenland; at BEO near Barrow, Alaska and at the Anaktuvuk River Burn in Alaska. Measurements were made during the growing seasons 2003 to 2009.
Plant survey of current vegetation of Sonoran desert plant community distribution in mountain parks in central Arizona-Phoenix, August 1999.
This study represents an effort to map the distribution of plant community types across the Central Arizona - Phoenix Long Term Ecological Research (CAP-LTER) site centered in metropolitan Phoenix using Landsat ETM data. Vegetation classification was carried out using field data collected from within the study area describing woody plant species. A system was devised which represented a compromise between providing floristic information and enabling maximum spectral discrimination between community types. Image classification used reference spectra derived from training sites in the field and was carried out on subsets defined by soil surface texture in order to control for the strong background soil signature inherent to arid regions. While groundtruthing revealed that vegetation on clayey soils was mapped to 91% accuracy, other sections produced maps with less accuracy. The results of this study demonstrate that image classification of desert vegetation using only Landsat ETM data is problematic and may not be practical without other supporting data, such as radar imaging.
Plant Survey of Current Vegetation: MAP OF SONORAN DESERT PLANT COMMUNITY DISTRIBUTION IN THE CAPLTER STUDY AREA, PHOENIX, ARIZONA
This study represents an effort to map the distribution of plant community types across the Central Arizona - Phoenix Long Term Ecological Research (CAP-LTER) site centered in metropolitan Phoenix using Landsat ETM data. Vegetation classification was carried out using field data collected from within the study area describing woody plant species. A system was devised which represented a compromise between providing floristic information and enabling maximum spectral discrimination between community types. Image classification used reference spectra derived from training sites in the field and was carried out on subsets defined by soil surface texture in order to control for the strong background soil signature inherent to arid regions. While groundtruthing revealed that vegetation on clayey soils was mapped to 91% accuracy, other sections produced maps with less accuracy. The results of this study demonstrate that image classification of desert vegetation using only Landsat ETM data is problematic and may not be practical without other supporting data, such as radar imaging.This project attempts to produce a vegetation distribution map across undeveloped parcels of outlying desert wilderness, as well as remnant mountain parks throughout the city, contained within the Central Arizona Phoenix Long Term Ecological Research (CAPLTER) study area. This effort seeks to create the first successful classification map of Sonoran Desert vegetation derived from satellite imagery. The map would also be the first fine-scale map of plant community types in the Phoenix region. The depiction would allow for a calculation of the land area covered by each vegetation class, and which communities are exposed to development pressures. This map potentially provides a basis from which researchers can measure vegetative biomass distribution across the landscape and attempt to incorporate this component into ecological models of energy flows and biogeochemical cycling in the CAP-LTER site. I
Vegetation surveys at CAP LTER ripirain-area bird-monitoring locations in the greater Phoenix metropolitan area (2013)
Over the past half-century, the greater Phoenix metropolitan area (GPMA) has been one of the fastest growing regions in the US, experiencing rapid urban expansion in addition to urban intensification. This backdrop provides an ideal setting to monitor biodiversity changes in response to urbanization, and the CAP LTER has been using a standardized point-count protocol to monitor the bird population throughout the GPMA and surrounding Sonoran desert region since 2000. A subset of these bird-monitoring sites are located in riparian areas, and additional riparian-area monitoring locations centered on the Salt River as it runs through the GPMA were added in 2013 and 2014. In May and June of 2013, the CAP LTER surveyed the vegetation in 6,400 square meter plots around all of these riparian-area sites as part of an analysis of change in bird abundance and community composition. This dataset catalogs the results of vegetation surveys at nineteen bird-monitoring sites in riparian areas of the GPMA.
Pre-burn survey of overstory vegetation at Jacobs Branch and Devils Den burn sites, 1989
On three sites in the southern Appalachians, stands characterized by sparse overstories and dense Kalmia latifolia shrub layers were felled in early summer and burned in early fall. Amounts of aboveground vegetation and forest floor mass, nitrogen (N), and carbon (C) were measured before and after treatment by sampling wood, foliage, herbs and grasses, and forest floor (Oi and Oe+Oa layers). Burning decreased woody mass by 48 to 60% across the three sites. Significant losses of mass, N, and C occurred in the Oi layer, but not in the Oe + Oa layer. Total aboveground N losses across sites ranged from 193 to 480 kg ha_-1_. These losses may be significant because N availability is low on these sites. Variations in patterns of mass, N, and C consumption were related to differences in amounts, types, size distributions, and moisture contents of fuels.
Vegetation Surveys in Chihuahuan Desert Grassland and Shrubland Sites Associated with Coyote Scat Surveys at the Sevilleta National Wildlife Refuge, New Mexico (2008-2009)
This data set contains information regarding vegetation structure at sites in grama grassland and both creosote and mesquite shrubland habitats at the Sevilleta NWR. This information was collected at randomly selected sites throughout the refuge. Each site is within 100 meters of one of the 22 road-based transects(20 in 2008) that were used to carry out coyote scat surveys during three seasons (spring, summer and fall) in 2009 (see "Coyote scat surveys in grassland and shrubland sites at the Sevilleta NWR, spring, summer and fall 2009" data set). Data was collected within at total of 22 circular vegetation plots (40 in 2008), each of which is 30m in diameter. Each plot was surveyed a total of three times, specifically in: April (spring), July (summer), and October (fall) 2009. Variables were selected based on their relevance to patterns of coyote habitat use, as well as their utility in calibrating Landsat images of the study site and the likelihood that they would vary seasonally. Measured variables include: average percent live woody vegetation cover, average percent live grass cover, average percent live forb cover, and average woody plant height. Information on woody plant species with individuals greater than 0.5 m in height is also presented.
Database of 242 vegetation surveys from Ticino Canton (Switzerland) grasslands
<p>This is a database of 242 vegetation surveys carried out in semi-natural grasslands of Ticino Canton (Switzerland), managed as conventionally managed grasslands (CMG) or biodiversity promotion areas (BPA). Many topographic, climatic, ecological, and vegetation variables are reported.</p>
Vegetation survey data to understand drivers of plant rarity
<p>Determining the drivers of plant rarity is a major challenge in ecology. Analysing spatial associations between different plant species can provide an exploratory avenue for understanding the ecological drivers of plant rarity. Here, we examined the different types of spatial associations between rare and common plants to determine if they influence the occurrence patterns of rare species. We completed vegetation surveys at 86 sites in woodland, forest, and heath communities in south-east Australia. We also examined two different rarity measures to quantify how categorisation criteria affected our results. Rare species were more likely to have positive associations with both rare and common species across all three vegetation communities. However, common species had positive or negative associations with rare and other common species, depending on the vegetation community in which they occurred. Rare species were positively associated with species diversity in forest communities. In woodland communities, rare species were associated negatively with species diversity but positively associated with species evenness. Rare species with high habitat specificity were more clustered spatially than expected by chance. Efforts to understand the drivers of plant rarity should use rarity definitions that consider habitat specificity. Our findings suggest that examining spatial associations between plants can help understand the drivers of plant rarity.</p>
Survey of winter bird communities and vegetation in the Oregon Coast Range
<p>We re-surveyed forest bird communities during winter in seven large plots originally surveyed by graduate student, Stanley Anderson, from 1968 through 1970, near Corvallis, Oregon, USA. The forests in plots in the Coast Range Mountain foothills were and are currently dominated by Douglas-fir (Pseudotsuga menziesii). Anderson's thesis included plot locations, summaries of vegetation characteristics and point estimates of bird densities for each plot. Because of the lack of similar data, we re-surveyed his plots after aligning methods with his and added modern components (distance and time interval sampling) to facilitate comparisons of changes in abundances. We preserved more extensive metadata than were preserved from Anderson's surveys, including georeferenced point count survey locations to facilitate more precisely repeatable future re-surveys. We also measured vegetation characteristics to compare structural changes since Anderson's measurements.</p>
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