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<br />I~ <br /> <br />Management Situation by Revision Topic <br /> <br />Rio Grande Nat.lonal Forut. <br /> <br /> <br />Sanare <br />d, Crl,t.o <br /> <br />'" <br />~,. <br /> <br />Wilderneaa Areaa <br /> <br />~" <br /> <br />Wemlnuche <br /> <br />Sout.h <br />San Juan <br /> <br />Figure 11I-12. <br /> <br />, V~t'Jtation A66Dciation -- R....giDnal. Wildt'JrI1l'J66 and Unroad&:l Art'Ja Pro6pt'JCtu6 <br /> <br />In 1979, the Rocky Mountain Region awarded a contract to land Inventory and Development, Inc., to <br />classify all vegetation on National Forest System lands within the Region. The approach used was based <br />on a widely accepted concept of classifying the potential natural vegetation as described in . Modified <br />Ecoclass.' This method classified potential natural vegetation (climax) in large heterogeneous units and <br />then categorized each of these into progressively smaller more homogeneous units. This system lists <br />broad units as plant formations, then plant regions followed by plant series, and plant associations. The <br />plant series used in this study is a group of plant communities in which the outward appearance of the <br />ecological structure is relatively specific and the communities can be charilcterized by one or more <br />common dominant climax species. Table 11I-10 shows plant series by acreage within wilderness areas in <br />Region 2. <br /> <br />The following outlines the Regional plant series. An example of how percent figures are derived follows: <br /> <br />Acres of plant series = % <br />Grand total (acres) <br /> <br />10.415=39% <br />26,750 <br /> <br />Acres plant series in wilderness = % <br />Grand total (acres) <br /> <br />2.379 = 55 % <br />4,262 <br /> <br />Acres plant series in wilderness = % <br />Acres plant series in Region <br /> <br />2.379 = 22 % <br />10,415 <br /> <br />,"',041::;,11 <br />. ",- v <br /> <br />111-41 <br />