Vegetation Classification and Mapping Project Report - USGS

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USGS-NPS Vegetation Mapping Program Colonial National Historical Park units on the ground. In most landscapes, the Ecological System will manifest itself on the ground as a spatial aggregation at an intermediate scale (e.g., between the USNVC Alliance and Formation scales). GLOBAL DESCRIPTION Concept Summary: A description of the range, structure, composition, environmental setting, and dynamics associated with the community. Information includes a general understanding of the type, often with some concept of its distribution; environmental setting in which the type occurs, and a summary of the important disturbance regimes, successional status, and temporal dynamics for this community rangewide; community structure/physiognomy; species by strata (dominant and diagnostic taxa); and key diagnostic characteristics that distinguish it from similar types. Environmental Description: A summary of available information on the environmental conditions of the Association rangewide and any other important aspects of the environment which affect this particular type, including elevation ranges and, where relevant, information on large landscape context, geology, and soils. Vegetation Description: A summary of available information on the leaf type and phenology, species composition (including dominant and diagnostic taxa, as well as problematic exotic species), structure (defining strata and their heights and percent cover), and variability of the vegetation of this Association rangewide, and any additional comments relating to the vegetation. Most Abundant Species: Component plant species that are dominant (i.e., most abundant in terms of percent cover) for the Association as it occurs rangewide. Stratum: For each component plant species, the stratum (or strata) in which it occurs in the Association rangewide. Values for Stratum are: Tree (canopy & subcanopy) Short shrub/sapling Tree canopy Herb (field) Tree subcanopy Nonvascular Shrub/sapling (tall & short) Floating aquatic Tall shrub/sapling Submerged aquatic 354
USGS-NPS Vegetation Mapping Program Colonial National Historical Park Lifeform: The lifeform of each component plant species that is present within each designated stratum of the community as it occurs rangewide. Lifeform definitions are from Table 3.1, page 37, of Whittaker, R. H. 1975. Communities and ecosystems. Second edition. Macmillan Publishing Co. New York. 387 pp. Values for Lifeform are: Needle-leaved tree Palm shrub Broad-leaved deciduous tree Dwarf-shrub Broad-leaved evergreen tree Semi-shrub Thorn tree Succulent shrub Evergreen schlerophyllous tree Ephiphyte Succulent tree Vine/Liana Palm tree Forb Tree fern Graminoid Bamboo Succulent forb Needle-leaved shrub Aquatic herb (floating & submergent) Broad-leaved deciduous shrub Moss Broad-leaved evergreen shrub Alga Thorn shrub Lichen Evergreen schlerophyllous shrub Fern or fern ally Other/unknown Other herbaceous Other shrub Liverwort/hornwort Species: Global scientific name (and common name) for each floristic component species of the Association as it occurs rangewide. Characteristic Species: Component plant species that are characteristic for the Association as it occurs rangewide. Other Noteworthy Species: Other noteworthy species (i.e., species that are not necessarily diagnostic of the Association, but that are worth noting for some other reasons, such as those that are rare species or nonnative invasives) that are found within the Association rangewide. USFWS Wetland System: Systems developed for the classification of wetlands by the U.S. Fish and Wildlife Service. System refers to a complex of wetlands and deepwater habitats that share the influence of similar hydrologic, geomorphic, chemical, or biological factors. As defined in Cowardin et al. (1979), the values are: Marine - consists of open ocean overlying the continental shelf and its associated highenergy coastline. Estuarine - consists of deepwater tidal habitats and adjacent tidal wetlands that are usually semi-enclosed by land but have open, partly obstructed, or sporadic access to the open ocean, and in which ocean water is at least occasionally diluted by freshwater runoff from the land. Riverine - includes all wetlands and deepwater habitats contained with a channel, with two exceptions: (1) wetlands dominated by trees, shrubs, persistent emergents, emergent mosses, or lichens, and (2) habitats with water containing ocean-derived salts in excess of 0.5%. 355
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Vegetation Classification and Mapping Project Report - USGS

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