vated 
COVER TYPE AND FIRE CONTROL 
25 
TasLte 12.—Acreage burned and size of fires by types, 1911-1920, 12 timbered 
Jorests 
GENERAL-RISK FIRES 
| : . Area 
Size Size 
Total Area Total pee ca} Durned 
Type area | burned | fires C fires BEE AES | SNe aoe ann 
fire C fire = 
ally 
1,000 | | 
acres Acres _ |Number| Number Per cent) Acres | Acres \Per cent 
Western yellow pine_-_________----- 4,554 | 395,747 | 3,090 642; 20.8 128 616 0. 87 
Wixed(copiiers2 S52 Pr 8 3,127 | -172)-125 |. 2,474 521 | 21.1 70 332 .55 
WYenete lst fitone, eee he eS 1,14 89, 332 626 1 EPA lies aa 143 491 DUE 
Sugar [NUTCS TS ee oS cee eens Se 475 19, 472 211 42} 19.9 92 4§ 41 
1) Es tle ES ree eee eae | 1, 644 22, 074 751 74 | 9.9 29 298 13 
(GieiCoa a: BONS Gee ee rene eer oe 555 32, 338 i83 64 35. 0 77 505 FF 
@hapanranlel ers i he Se 403 | 120,792 224 128 57.1 539 944 3. 00 
Wd lance ee ee ee ee rare 951 79, 224 296 99 33. 4 268 800 . 83 
BTS He eek Ee 2,239 | 278,007 | 1,100 | 383 34.8 253 | 726 1. 24 
‘Eotal/oraveragvet ss ahs 2 » 15, 083 [> 209,711 | 8,955 | 2,135 23.8 135 567 80 
ALL FIRES 
Western yellow pine____---.-.----- 4,554 | 502,552 | 3,654 784 25 157 641 1.10 
iVirxce Conner. i 2 = Feat ok Se ea = 3,127 | 200,444 | 2,999 650 QI 67 308 . 64 
Dou elasitins 2 28 eRe kee Ss 1, 145 92, 403 659 192 29.1 140 481 81 
SHsar pine ir. See es 475 20, 717 242 ol 21.1 86 406 . 44 
[Reo See ey ee a eo 1, 644 38, 726 811 89 11.0 48 435 .24 
SUG a SA Bak OO peop NR in 555 37, 306 224 80 35.7 167 466 . 67 
@haparraes 2 e  ee 403 | 153, 475 281 161 Net 546 953 3.81 
Woodlands 2). tS ee ee ea 951 §3, 113 330 115 34.8 52 723 . 87 
DPSS Biss ee a 2 eh 2,239 | 324,475 eee 1, 276 447 35. 0 254 726 1.45 
"Eotal or average 222 2 eee 15, 093 |1, 453, 211 | 19,476 | 2,569 | 24.5 139 566 96 
t 
SUMMARY OF ALL FIRES BY TYPE GROUPS 
Western yellow pine, mixed conifer | | 
PTO ae ee ee eS 7, 681 702,996 | 6,653 | 1,434 21.6 106 490 0. 91 
Sugar pine-fir, Douglas fir, firgroup_| 3,264} 151,846 1,712 332 19. 4 | 89 457 47 
PANTIE EYER DG es ee = SOS a 6S Ee 10,945 | 854,842 | 8,365} 1,766 PAI 102 484 acl 
Chaparral, grass, woodland group__| 1,909 3, 894 | 835 | 356 42.6 | 328 | 769 1.43 
been seen, such frequent burning reduces, at least temporarily, the 
watershed value of these lands, and the fires frequently encroach on 
adjacent timber stands. 
The combined loss rate due to both general and special risk ae 
(Table 12 and fig. 7) varies in the same order iweeion types as the 
loss from general-risk fires alone. In the western yellow pine type, 
where fire-using agencies are numerous, especially logging, the average 
annual loss is raised to 1.1 per cent. This is nearly five times as creat 
as in the fir type, the easiest of all the timber types to protect and 
with the lowest present values at stake. Here the annual loss rate 
has been held near to the 0.2 per cent of maximum allowable burned 
area. In the restocking brush fields the loss is six times as great as 
in fir and over three times as great as for all timber types. 
These figures for the entire pine region obviously are a very general 
expression of the success of protection and the relative spread of fire 
in different types. Natural groups of forests or individual forests 
may show considerable difference in the degree of success attained. 
In the northern group (Table 13) the loss rate in the western yellow 
pine type (1.38 ‘per cent) approaches that in the restocking brush 
fields (1.53 per cent). But here, as for the region as a whole, the fir 
