26 BULLETIN 1200, U. S. DEPARTMENT OF AGRICULTURR. 
TABLE 11.—Number of seedlings per acre found on a belt transect one year after 
mature timber had been killed by the Two Lakes fire, etc.—Continued. 
Number of seedlings per acre. 
Chains distant | 
from green tim- | | 
ber. | Douglas Noble Silver Western | Western |Engelmann Total 
| fir far fir. hemlock. | red cedar. spruce. Be 
| | 
| 
PSY a. Dy aKa mh eel Hi eA ee ang Roh Fa esr ERS Ale exp | hh cen Lis 3) 80 
PASE HAE Liege LG Oi BORON EAe UARE RN meee Ase to ee SLO INS RES AAAS aU UR Vat YAO RE aN 240 
Pare NE ON Se iy 240 PLO [ee Rn OO 0 UL Ge UTA a QS SNR 6 320 
DOr ee aeL) WE OM, | LG OS ae aes AA RI 0 PAO OU ee EE: aoa 400 
Fo nS A Oe SU ONG | 80 SOc Son ete ANT OVI Wei ae DN ee Searle Hy Ah eso 8 800 
BOER ernie cum ar GTC SL OT sept yi ea (Ba ale th 160 | SO) at Rae. 400 
au 2 0 BE ea aS wpe Ce ZAO HS cei. . Ser yee aces 560 | 240 Ws, eck eee ae 1, 040 
Pa SN EP as SUE NY SE SUN i HERE ACN LER ee SUMO UA gen WE 2s 2) 2s Nal Deere ee 0 
Sees a ahaa 5 ed 2 LOOMS Sa ee 80 AQQU ICS (RRM SAE ee ee re 640 
SU Ea Ee Rees Cena ADO) er SUE sey 240 880: 560 160 2, 240 
Sa Sl als Mme ee AR (eee ste Sac, She wa Nene Monies Meee Tat Bed eo ae a 80 560 
SOT Cg ns RAY 480 80 SO olin Fcc edt 3 2 Jeg, Rei ad a 160 800 
Be UN oe Sinica AQQ Here tert Mite SO alee eis Gee 80 80 640 
SENSU TATE. ees ZEON Ss A ES ae SS Sa DAV i SO 320 1, 040 
SOR UNG HA: TUE ee. 560 80 320 SO ala ee 720 1, 760 
cE eel denen a gS 800 240 80 PO4Q eet Bed etECh 400 2, 560 
CO ee aN eee Loar DAO!) breenetonr He cps 80 1,120 | 320 490 2, 160 
ADI ENS D ON, 5 aes SMe 240 160 240 2, 880 | 240 1, 040 4, 800 
Sera ka NE TH AU AE ASME Bs ME he 560 160 | 240 1, 040 3, 120 
AA la eRe ES EMIT Mia 880 1, 200 2,320 
ELOUNaS sore ony ame Siete 80 80 960 2, 160 4, 800 320 8, 400 
AG ASE ag see re irs 720 560 3, 200 9, 840 | 19, 200 640 34, 160 
257 ll sara CAA 400 580 1, 680 1, 0640 | 10, 560 1,120 24, 960 
$8 4588 ERE 8 400 160 640 880 | 240 560 2, 880 
ASF (ak Nec EE ae 160 160 240 800 240 320 1,920 
Oo) ea arctic del azn 1,120 89 720 880 | GOA sheen hin Sea 2, 960 
Olean UB bs S80 thes Sinaia lens 400 LOO pee ee cat 80 1, 520 
ES el snipe a Gea anh DAH Seen ten neres 240 160 | SUR Dies seek sean 
The scattered stand of young growth on this transect adjacent to 
the green timber, and the alternation of sparse stands and barren 
areas up to 25 chains from the green timber are evidence that the seed 
was not distributed from the remaining seed trees, and that the dense 
stands of reproduction that occurred farther out in the burn were 
a to seed that was on the area before the fire and lived through the 
re. 
From chains 38 to 51 the soil was moist, and conditions for the pro- 
tection of seed during the fire and for the establishment of seedlings 
after the fire were very favorable. These, no doubt, were the princi- 
pal factors responsible for the dense stands of young growth that 
were found in this locality. The barren areas nearer to the green 
timber lie on more exposed slopes, where the soil was susceptible to 
heating during the fire and unfavorable to the establishment of seed- 
lings after the fire. Often there was a pronounced line of demarca- 
tion between the good stands of young growth and the barren areas 
along moist draws or slopes, as shown in Figure 5. 
EFFECT OF GROUND FIRE ON CHARACTER AND DENSITY OF 
YOUNG GROWTH. 
A ground fire may be the decisive factor in the regeneration of the 
forest. Where it creeps through the duff and litter it destroys nearly 
all the seed in the forest floor and leaves a bed of deep ashes and ex- 
posed mineral soil. Ifa ground fire occurs in the fall when the seed 
is about mature or before it falls from the trees, the new crop of seed 
produces a dense stand of seedlings in the immediate vicinity of the 
seed trees. ; 7 
