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2002 Natural Resources Management
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2002 Natural Resources Management
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7/13/2012 10:46:09 AM
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7/13/2012 10:41:05 AM
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Evaluation of upland sites to determine the natural community type was done using methodology <br />outlined in Minnesota's Native Vegetation, A Key to Natural Communities (Minnesota <br />Department of Natural Resources, 1993). This key is the best statewide guide to the <br />classification of native plant communities. <br />Field inspection of some potential sites indicated that all or part of these sites are dominated by <br />non - native vegetation, and are therefore not classified as a (native /remnant) natural community. <br />These types of plant assemblages would be given common descriptive names of "old field" and <br />"conifer plantation" to identify the plant community types. <br />Upland Qualitative Ranking <br />To provide further information about the quality of the upland natural communities in the study <br />area, each natural community was assigned a qualitative ranking. Sites are ranked on a scale <br />from A to D. with "A" quality communities being the highest in ecological quality, and "D" <br />communities being the lowest. <br />Standardized ranking criteria established by MnDNR's Natural Heritage Program were used to <br />evaluate the quality of natural communities. Some examples of criteria utilized for ranking are <br />the degree of native species diversity, age of trees, amount of disturbance, and invasion by non- <br />native plant species. <br />Rankings reflect how closely a given site resembles an intact or "pristine" community of its type. <br />Those sites that are most like intact natural communities have an "A" rank; conversely, "D" <br />quality communities have been highly altered. Due to the high level of human activity in <br />urbanizing landscapes, "A" quality communities are very rare. <br />Communities of A to B quality, generally exhibit little disturbance and are high in species <br />diversity. For example, forest communities would be comprised of old growth trees and have a <br />diverse group of shrub and ground cover species characteristic of the natural community type. <br />Disturbances from human activities and invasion by nonnative shrubs such as buckthorn would <br />be absent or minimal. <br />City of Roseville 61 <br />Parks Natural Resource Management <br />
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