|
•Cl~l~ll l.al lrUlUt !
<br />' ~ ~ Section LI-F 5oodland
<br />I:esourcc Areas 34,;;5,
<br />47,4i'-,49,51,69,70
<br />' :larch 1, 1966
<br />U?:ITED STATGS DLPAIITi~::T OF AG^.ICULTUI:E
<br />' Soil Conservation Service
<br />Colorado
<br />PIi:YOi: - JUiiLPER
<br />' SITE DCSC.^.IPTI0:15
<br /> ,,^.ange in Elevation: 5,000 - 7,500 feet - San Luis Valley 3,000-9,000
<br />' Precipitation E:ange: 12 to 15 inches
<br /> Average Annual Temperature: 49° - 53° F
<br /> Frost Free Period: 60 - 120 days
<br />'
<br /> General Description o° the tune: The pinyon - juniper type i~oodland occurs at the
<br /> locaest elevatiors o` ta e coniferous woodland types in Colorado, Lt is the
<br />' transition zone beta:ec_, grasslands and the montane forests, At the lo~:cr limits
<br /> the type nay consist o_ scattered to almost pure stands o; Utah juniper en th•=
<br /> ::estern slope, and one seeded juniper on the Eastern slope, As the type blends
<br /> into the Ponderosa pine or gal;brush types, pinyon pine and Rocl:y i'.ountain juni-
<br />' per become the dominant species. Betcaeen Che extremes pinyon and the various
<br /> junipers constitute a t rue plant association,
<br />' Associated Overstorv nlants : E:;cept for stunted ponderosa pine near the upper
<br /> elevations of the t;~pe there are no associated trees in the type,
<br />' Associated Understory plants:
<br />Unger Limits
<br />' ;'lountain mahogany, Indian rice grass, mutton grass, sedges, prarie junegrass,
<br />big sagebrush (west slc?e), service berry, cliff rose.
<br />Lower Limits
<br />Lndian rice grass, blue grama, galleta, cheatgrass, Fendler three a~an, P,abbit-•
<br />brush, Snakecaeed, Fleabane.
<br /> Lffects of Aspect an~ Position: At upper limits of type it prefers south and west
<br />' facing slopes. On slopes the density is usually less than on :latter areas.
<br /> ?lesa tops, moderately sloping lands, ano valley floors usually have Wore Jense
<br /> stands,
<br /> Site Index: :;o site index: curves arc available for these species, ldhile some
<br /> stands will reach heights of over 3~ feet, many stands do not reach over 20
<br />' feet. Because o. the uniformity of the type no site index will be used.
<br /> L,-?a tolerance: To secure reproduction some shade is needed, but the best ~rc:t:.
<br />' is e;adc in _ull sunLi~!-,t.
<br /> l_es o: the Species: Jcni;.crs arc a good source of fence posts. Pinyon pine i~ .:
<br /> Cood fuel :good species and good for Christmas tr ees. Some trees on areas o'
<br /> deeper soils arc ballet and burlapped as ornamen tal trees, Pinyon nuts in
<br /> ;nod sec.'- ~•~~:rs ::rc ci=~ a valuable product,
<br />1
<br />' 21
<br />
<br />
|