20 



BULLETIN 1105, U. S. DEPARTMENT OF AGRICULTURE. 



Table 8. — Distribution of first-year seedlings with reference to seed tree9. 



A.— INDIVIDUAL PLOTS ON AREA 3A, AUGUST, 1919. 

 Group 1. 



Natura] 

 plots 



sVio 



leet. 



Distance i and direction of 

 nearest seed trees.^ 



Number 

 of seed- 

 lings per 

 square 

 foot. 



Culti- 

 vated 

 plots 

 5 by 10 

 feet. 



Distance i and direction of 

 nearest seed trees.^ 



Number 

 of seed- 

 lings per 

 square 

 foot. 



E-1.... 

 E-2.... 

 E-3.... 



E-4 



40 feet W., 50 feet E. ; sim 



foot E., 35 feet NW.; sim 



25 feet N., E., W.; group; sun. . 



35 feet N. and E.; sun 



60 feet N. and E.; sun 



1.22 

 3.70 

 2.04 

 1.60 

 .42 

 1.34 

 3.84 



5.20 

 1.44 

 4.70 



F-l.... 

 r-2.... 

 F-3.... 

 r-4.... 

 E-5. . . . 

 F-6. . . . 

 F-7. . . . 

 F-8.... 



F-9. . . . 

 F-10... 



40 feet W., 50 feet E. ; sun 



foot E., 35 feet NW.; sun 



30 feet N., E., W.; group; sun. . 

 40 feet N. and E.; sun 



0.46 



2.76 



1.32 



.28 



E-5.... 



55 feet N. and E.; sun. .. . 



.62 



E-6.... 

 E-7.... 



E-8.... 



40 feetN., 65 feet W. ; group ; sun 



5 feet W.; group; shade 



10 feet S., E., and W.; group; 

 shade 



45 feet N., 65 feetW. ; group; sun 



5 feet W. ; group; shade 



10 feet S., E., and W.; group; 

 shade 



.88 

 8.44 



8.68 



E-9.... 

 E-10. . . 



40 to 60 feet, all around; sun . . . 

 5 feet W.; group; part shade.. . 



40 to 60 feet, all aroimd; sun . . . 

 5 feet W;. group; part shade. . . 



1.12 

 3.00 



Group 2. 



Group 3. 



Natural 

 plots 



5 by 20 

 feet. 



Distance i and direction of 

 nearest seed trees.^ 



Number 

 of seed- 

 lings per 

 square 

 foot. 



Natural 

 plots 



5 by 20 

 feet. 



Distance i and direction of 

 nearest seed trees. ^ 



Number 

 of seed- 

 lings per 

 square 

 foot. 



r^ 



100 to 125 feet, all around; sun. . 



50 feet W.; 80 feet E.; sim 



50 feet E., 70 feet S.; sim 



10 feet S.; group; shade 



100 to 125 feet, all around; sun. . 

 30 feet N. and NE. ; group; sun. 

 75 to 100 feet, all around; sun. . 

 40 feet S. ; group; sun 



0.51 

 .99 

 .73 



4.62 

 .44 



1.22 

 .45 



1.04 



22 

 23 

 24 



20 feet N.; group; sun 



1.85 



H-4.... 



1-4 



J-4-5. . . 

 1^1.... 

 H-7.... 



1-7 



I~8 . 



100 feet SW., 120 feet SE.; sun. 

 120 feet W. and S.; sun 



.60 

 .37 









1 Distances measured to edge of crown. 2 Location of plots and trees shown in figure 1. 



B.— SUMMARY BY AREAS. 



Designation of area. 



Basis 

 number 

 of plots. 



Number of first-year seedlings per square 

 foot at various distances from seed 

 trees. 



Character of 



0to25 



feet. 



25 to 50 

 feet. 



50 to 100 



feet. 



100 to 150 



feet. 



stand. 



IB 



10 

 21 



12 

 10 



2.35 

 2.53 



2.32 



1.32 

 1.30 



1.51 

 3.30 





0.40 

 .48 



.41 



Old cutting. 



3a 



0.78 

 .91 



Forest Sendee 



3b 



cutting. 

 Do. 



6 



Virgin. 













Note.— All plots receive at least half of full sunlight; all on level sites. 



Table 9. — Frequency of seed crops and theiir relation to reproduction (sample 



plots 3A and SB). 



Year. 



Seed crop. 



Number 

 of seed- 

 lings per 

 acre in 

 1920.1 



Year. 



Seed crop. 



Number 

 of seed- 

 lings per 

 acre in 

 1920.1 



1909 



Good 



0.5 

 4.5 

 13.2 

 

 37.0 

 

 35.0 



1916 

 1917 

 1918 

 1919 

 1920 

 1921 



Light 



8.4 



1910 





None 







1911 



light 



Heavy 



10,000 



1912 



Fair 



None 







1913 



Good 









1914 



None 



Good 





1915 



Fair 













I Number surviving in 1920, whose origin is credited to the seed crop indicated on the same line. 



