Tas_e 25.—Potential annual growth } of conifers of indicated diameter range in the Douglas-fir region, by survey units 
Trees 15.1+ inches d. b. h. 3 
Trees 5.1+ | Trees 11.1+ 
Unit inches inches ? Distribution by site quality class— 
d. b. h. d. b. bh. Total 
growth | 
I Il Ill IV Vv 
i Million Million Million 
Puget Sound units: cubic feet board feet board feet Percent | Percent | Percent | Percent | Percent 
Noni heBupet; sOouUnGES === Nede oo ee eee ae 224 981 609 0.7 32.1 50.5 16. 4 0.3 
Central Puget Sound 363 1, 605 1,012 2.2 35. 1 49, 2 12.8 wilt 
SouthyPugetyS orn cee es ee ee es eee 196 940 652 7.2 60. 1 29. 7 AOS |Peeeeee 
TANG Lo ae a ee ee eee 783 3, 526 2, 273 3. 2 | 41.5 43.9 11.0 .4 
GrayspHarhborienss soe sesss eas ose she ea arise Se 264 1, 297 933 14.3 71.6 11.8 2.2 1 
Columbia River units: 
GolumbisvRiverwmWash==cens= 2) =e 204 924 604 1.5 47.4 42.1 8.6 4 
Columbia; River Oregea wetness ms sans ooo eee 247 1119) 732 3.4 49.9 36. 2 9.9 6 
ST Ge] eee eee Sea en ee Sere a eee eee 451 2, 043 1, 336 2.5 48.9 38.8 9.3 mt) 
| 
WillamettemR iv erase sees te reeaaer n= eee es crces Sekeee eee 424 1, 918 1, 238 1.0 26.7 68.0 | 3.8 ad 
Oregon coast units: 
NorthiOregoncoash:4ausaie is See Se eases aes 185 904 644 me T.2 19.5 1.0 1 
SouthwOregonicoast{sies = ws ser etre ee SE eee 226 1,077 741 5.4 56. 3 35.6 Delt [eee 2 ee 
| 
Ie 0 bal] Baa RNS re ee ey Re sek hae peat De eee a san ee 411 1, 981 1, 385 6.7 63. 2 28.1 1.9 al 
South Oregon units: 
Um pquarRiv cress tase seo tate nse ee enn sas ee ene eee 229 _ 990 603 1.2 25.7 55. 0 17.4 a 
Rogue River 6 __ ae 197 820 476 2.9 14.3 55.0 26.8 1.0 
fo tall beeen te ey nee hte sgt ne 426 1, 810 1,079 2.0 20. 7 55.0 21.5 8 
Regionalitotaliomaverage.-se2- = 22 ans aote oe eee 2, 759 12, 575 8, 244 4.4 44.8 41.9 8.5 4 
| | 
Summary by districts: Percent Percent Percent 
Ruget;S UM dr ss Sa ne ee ee Se 28.4 28.0 27.6 
(Graysidlanb Oreste eae at a = a en ee 9.6 10.3 1 
@olumbiaiRiy cress seesaw see ees ene eee anon 16.3 16.2 16. 2 
WallametteiRivers==sse= saw iatee bees ere Sot 15.4 15.3 TOROH Pes s 2 a alles os. SR ee aE eee 
Oregon COAST sss ae ee See os a ee eet 14.9 15.8 VG OG eee ts Jae ON eet Ne oe Be on tea ee a oe oe 
SouthiOreg omer ae an a eee ee 15.4 14.4 a1 BE 7c a el | eee ee |S ee ee | ger ere (ee eee eee es 
IRefionalito tale< see saws ete Se ee = =e == 100.0 100.0 
1 On commercial conifer land. Calculated at annual growth rates shown in table 22. 
2 Growth estimated by Scribner rule in 16-foot logs to 8-inch top. 
3 Growth estimated by Scribner rule in 32-foot logs to 12-inch top. 
4 Data include growth on 182,060 acres of potential conifer forest land temporarily occupied by hardwoods (type 31). 
5 Data include growth on 14,520 acres of potential conifer forest land temporarily occupied by hardwoods (type 31). 
8 Data exclude growth on 6,510 acres of pine woodland (type 514) considered noncommercial forest land. 
224146°—40 
5 
61 
