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<br />GENERALIZED <br /> <br />VEGETATION <br /> <br />OF THE <br /> <br />SOUTHERN <br /> <br />SAN JUAN <br /> <br />MOUNTAINS, COLORADO <br /> <br />96(9 <br /> <br />by P.v. Krebs and <br />Institute <br /> <br />D.P. Groeneveld, <br />of Arctic and Alpine Research <br /> <br /> <br />H3701S' <br />VI ID70 00' <br /> <br />v. S. Dow, Cartographer <br /> <br />r <br /> <br />Q <br /> <br />- <br /> <br />o <br /> <br />D <br /> <br />APPROXIMATE MEAN <br />DECLINATION <br /> <br />DeckJuous Forest <br /> <br />localized orlOI predominated by alpin (Populus IremuJoidtJs) or <br />Gambel's oak fOu6rcus ~ ueually indicates dIoturbance from <br />IooolnQ, tre, mnlnQ, kJnds~, or over grazlnOI may form a topo- <br />edq>hle climax <br /> <br />Coniferous Forest <br /> <br />climax forest of conifers; on at eWKrttonol C7adlent (5,000- <br />8,500 It., racky mountain Juniper 61un~rus scopulorum~ pmn <br />p<>e (PhIS s"".tJs~ 6,ooo-IO,Zoo ft., ponderasa pine (f'fnus <br />potIdMosaJ, daugiosfio (PstlUdDfsuga msnriBsilJ, while flr (AbitJs <br />concolorJ; 9,000-12,000 ft., Enoelmcm spruce fPic60 tlngeknannlJ, <br />subalpine IIr (Abiss losciocorpaJ] <br /> <br />Tundra <br /> <br />mosaic of plant ccmmunltles aboYe tinberllne, generally charac- <br />terized by law-growing (dwarfed) vegetation af perennial species <br />of sedges, Qrasses, herbs, and mnute shrubs, to fell-fields with <br />crustall lichens, cushion plants, and other perennial species <br /> <br />Bare Rack-Bare San <br />areas where surfacing rock outcrop. or r~atlvely bore soil predom- <br />inatesl talus slopes. and rock oloclen <br /> <br />- <br /> <br />SCAL.E tt2O,OOO <br />I ! a <br />..--- <br /> <br />Conl_ Interval 800 ft <br /> <br />Fund, provIded by: <br />NASA COf'Itroct NAS9-13380 <br />NASA GrOll' NGL-Ql-003-2OQ <br />Bur. of Rlc. Controct 14-01-0-6982 <br /> <br />- <br /> <br />~-;1;;':: <br />..--". <br />- .- <br /> <br />l1li <br /> <br />Water <br />Impoundment. bath naturol and mon-made <br /> <br />,- <br /> <br />/:m....\ <br /> <br />Dectduous-CorMferous Forest <br /> <br />mixture of aspen or Gombel', oak with conlf.roul species, reflect. <br />an ana of post dllNrtonc., (fir.. IoQQlno, or minlnQ) <br /> <br />Meadow-Grassland-Agriculture <br /> <br />Qrass-Ike communlties~ may be maintained by disturbance {5,OOO- <br />9,000 ft.!. edaphlc eimax (8,500-0,000 ft.!. succes.lanol <br />(9,500-IZ,OOO ft.)... gra.slands are pari<-Ike and heavily grazed, <br />aorlcultural areas ore crops, hoyilQ meadows. and cleored <br />forest land <br /> <br />Creek Community <br /> <br />deciduous and coniferous species 010n9 stream bonks and <br />floodplains characterized by Colorada bkle .",uee (Picsa <br />pung.ns), narrow- feoved cottonwood (Populus ongusllfolla), <br />willow (Solix spp~ alder (Alnus spp..( and birch (SsMa spp,J <br /> <br />D <br /> <br />~.i. 0 <br /> <br />I~... <br /> <br />Maplocotlon <br /> <br />Urban <br /> <br />areos of popukltlon concentration showlnO ahered vlQltation patterns <br />which differ markedly from the natural veoetatlon <br /> <br />--.. -- <br /> <br />~- <br /> <br />- <br />