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66 results found
The Alaska vegetation classification presented here is a comprehensive, statewide system that has been under development since 1976. The classification is based, as much as possible, on the characteristics of the vegetation itself and is designed to categorize existing vegetation, not potential…
Author(s): L.A. Viereck, C.T. Dyrness, A.R. Batten, K.J. Wenzlick
Keywords: Vegetation, classification, Alaska, tundra, boreal forest, coastal forest, plant communities
Source: Gen. Tech. Rep. PNW-GTR-286. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 278 p
Year: 1992
This document presents two spatial scales of a hierarchical, ecoregional framework and provides a connection to both larger and smaller scale ecological classifications. The two spatial scales are subregions (1:250,000) and landscape-level ecoregions (1:100,000), or Level IV and Level V ecoregions…
Author(s): Sharon E. Clarke, Sandra A. Bryce
Keywords: Ecoregions, anadromous fish habitat, fish habitat, watershed classification, landscape ecology, water quality, environmental mapping, classification
Source: Gen. Tech. Rep. PNW-GTR-395. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 114 p
Year: 1997
A classification of community types, successional sequences, and landscapes is presented for the piedmont of the Copper River Delta. The classification was based on a sampling of 471 sites. A total of 75 community types, 42 successional sequences, and 6 landscapes are described. The classification…
Author(s): Keith Boggs
Keywords: Alaska, Copper River Delta, classification, community type, succession, landscape, outwash, floodplain, delta, dune, barrier island
Source: Gen. Tech. Rep. PNW-GTR-469. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 244 p
Year: 2000
Traditional land classification techniques for large areas that use Landsat Thematic Mapper (TM) imagery are typically limited to the fixed spatial resolution of the sensors (30m). However, the study of some ecological processes requires land cover classifications at finer spatial resolutions. We…
Author(s): Suzanne M. Joy, R. M. Reich, Richard T. Reynolds
Keywords: Accipiter gentilis, classification, non-parametric classification, vegetation types, decision trees, Kaibab National Forest
Source: International Journal of Remote Sensing. 24(9): 1835-1852.
Year: 2003
This report describes 14 meadow site classes derived through techniques of agglomerative cluster analysis. The class names are: Carex rostrata (beaked sedge), Poa (Kentucky bluegrass), Heleocharis/Heleocharis (ephemeral-lake), Hypericum/Polygonum/ Viola (hillside bog), Trifolium/Muhlenbergia (…
Author(s): Raymond D. Ratliff
Keywords: Meadow, meadow site, meadow ecology, meadow management, Sierra Nevada, classification
Source: USDA Forest Service General Technical Report PSW-60, 16 p.
Year: 1982
A taxonomic Vegetation Classification System proposed for use in California is designed to simplify interdisciplinary communication about vegetation. The system structure is an aggregative plant community hierarchy at four levels of precision--the Association, Series, Subformation, and Formation. A…
Author(s): Timothy E. Paysen, Jeanine A. Derby, C. Eugene Conrad
Keywords: Vegetation classification, plant community classification, vegetation types, plant communities, classification, resource classification
Source: USDA Forest Service General Technical Report PSW-063, 14 p.
Year: 1982
Wood inhabiting, rotting and/or decomposing fungi from Alaska include representatives from an assortment of fungal groups (cup, jelly, pored coral, tooth, puffball, gilled and lichenized fungi) and one fungus-like group (the slime molds). Of the more than 1,500 species recorded for North America,…
Author(s): Gary A Laursen, Harold H. Burdsall, Rodney D. Seppelt
Keywords: Myxomycetes, Ascomycetes, Basidiomycetes, wood-decaying fungi, classification, fungi, Alaska, identification, utilization, mycological surveys
Source: Alaska park science. Vol. 4, no. 1 (June 2005): pages 18-25.
Year: 2005
Eight species of Phanerochaete are reported from Uruguay for the first time, including a new species, P. vesiculosa. Phanerochaete vesiculosa is characterized by thin-walled, clavate to cylindrical vesicles embedded in the subiculum. A key to the known species of Phanerochaete from Uruguay is…
Author(s): Sebastian Martinez, Karen K. Nakasone
Keywords: Phanerochaete vesiculosa, taxonomy, Corticiaceae, wood-decaying fungi, classification, identification, Basidiomycetes, taxonomy
Source: Sydowia. Vol. 57 (2005): p. 94-101.
Year: 2005
Five new species of Psilocybe from the Caribbean are described: P. caribaea, P. egonii, P. subpsilocybioides, P. zapotecoantillarum and P. zapotecocaribaea. All except P. zapotecocaribaea, which is known only from Martinique, are native to Puerto Rico. Psilocybe guilartensis, previously described…
Author(s): Gaston Guzman, Fidel Tapia, Florencia Ramirez-Guillen, Timothy J. Baroni, D. Jean Lodge, Sharon A. Cantrell, Nieves-Rivera, Angel M.
Keywords: Agaricales, Antilles, Martinique, Puerto Rico, Strophariaceae, Psilocybe, biogeography, fungi, Caribbean area, classification, identification, fungal communities, fungi ecology, tropical fungi, taxonomy, Psilocybe guilartensis
Source: Mycologia. Vol. 95, no. 6 (2003): pages 1171-1180.
Year: 2003
Transitions from grassland to shrubland through woody plant encroachment result in potentially significant shifts in savanna ecosystem function. Given high resolution imagery, a textural index could prove useful for mapping woody plant densities and monitoring woody plant encroachment across…
Author(s): Andrew T. Hudak, Carol A. Wessman
Keywords: remote sensing, texture, case history, aerial photography, South Africa, savannah, vegetation succession, vegetation structure, canopy, woody plant, geostatistics, population density, vegetation map, classification
Source: Remote Sensing of Environment. 66(3): 317-330.
Year: 1998