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<br />000701~ <br /> <br />o <br /> <br />3 5 <br />Years <br /> <br />7 9 11 <br />olter cleorculling <br /> <br />13 <br /> <br />15 <br /> <br />public lands. with most of the remainder on Indian <br />lands. or the l1carlv 6.9 million acres considered <br />capable of commercial timber production. nearly <br />two-thirds of d million acres are in ~ational Parks. <br />wilderness areas, high value scenic areas. and <br />similar land ust! categories. The elevation range for <br />ponderosa pine is bd\....een 6.000 and Y.OllO feel. <br />where the type gro\\'s best on sites that are warmer <br />and urier than those occupied by mbwd conifer <br />and subalpine forests. Garnbel oal and chaparral <br />species are (;DmmOn understory plants in the lower <br />fringe area of the pine. Annual precipitation is <br />about one-half snow and averages from 15 to 25 <br />inches in the Upper Basin and 20 tu 25 inches in <br />the Lower Basin. \\'at~r yield is d~rived mostly <br />from snuwmelt and iH'erages 2 tn 6 inches annu- <br />ally. depending on precipitation, elevation, and <br />soils. Theoverall average is probably 3 to 4 inches. <br />Th~ potential for increasing wateT yield in POIl- <br />oerosa pine is less than from other commercial <br /> <br />6 <br /> <br /> <br />. <br />. <br />~ 4 <br />c <br /> <br />. <br />. <br />o <br />5 2 <br />c <br /> <br />Figure 14,-lncreue tn welet yield declines tlpldly Iller <br />clearculling Ispen. when regrowth is permltt.d(p.rson.r <br />communiCIUon with Norb.rt V, OeByte. Intermounl.in <br />Fotest Ind R.nge E.perlmenl St. lion. Foteslry Sclenc.s <br />Laborllory. Logan. Uti h). <br /> <br /> <br />. .''-- _..;. ... ,....... ....0.. <br />~ .,' ~ ~ 'h ~ ,. <br />.t. ii:-'l~~: ,""~..".'-,., .. <br />.~..:"'l~;::):~- ,.,'. +~~;.~:=,~ -~"* <br />;~~t;~t. .......~~~.: .:. .~"-:...r~, <br /> <br />~~>t; <br /> <br />Figure 1S.-Pond.rOSI pine near Flagslafl. Ariz. alter In improvement seleclion cui in 1941, <br />NOle thick reproduction 111.1t. There are Ippro.lmately 1.5 million acr.s 01 ponderosa pine <br />In the Upper Bastn and 6 million .cres In the lower Buln. <br /> <br />12 <br />