Current Literature 61 



A more detailed report giving the results on all areas remeasured 

 in 1914 will be prepared this winter. It is to be hoped that it will 

 appear in the "Review of Forest Service Investigations" or else- 

 where, since the results deserve the widest publicity among tech- 

 nical foresters in view of the interest attaching to methods of de- 

 termining the increment in uneven-aged stands as evidenced by- 

 such a symposium of articles on this subject as that in Vol. IX, 

 No. 2, of the Proceedings of the Society of American Foresters. 



DATA ON PERMANENT SAMPLE PLOT S-3, TUSAYAN NATIONAL 

 FOREST, ARIZONA 



1909 1914 Increase 



in 5 Years 



Area of plot, 456 acres 



Number of trees 4 inches or over d.b.h 



Living, total 8,255 8,400 145 



Yellow pine" 623 647 



Black jack2 7,632 7,753 



Dead, total 180 



Yellow pine 22 



Black jack 158 ' 



Total volume, ft. b.ni. 12 inches or over 1,550,910 1,756,328 265,418 " 

 Total increment for five years =13.2 



per cent. =2.64 per cent per year. 



Volume Yellow pine, ft. b.m 493,290 547,060 53,770 



Volume Black jack, ft. b.m 1,057,620 1,209,268 151,648 



The current annual increment per cent, of this average stand is, 

 therefore, 2.6-4. Measurement made in 1907 on the same forests 

 and using the method of predicting growth by the applying diam- 

 eter growth tables to the stand on an average acre gave an incre- 

 ment per cent, of 1.88.^ The comparison of these results is most 

 interesting and bespeaks the need of just such data as are now 

 being secured if the allowed annual cut is to be determined 

 accurately. 



REPRODUCTION 



Counts on twenty (5 x 10 feet) plots give an average of 3.75 

 seedlings of the year 1914 per plot. Only two older seedlings 

 (entered since 1909) were found on all the plots. A few seed- 

 lings over five years old are scattered over the area. The pres- 



'The terms "Yellow pine" and "Black jack" refer to the mature and 

 immature forms, respectively, of the Western Yellow pine. See U. S. F. S. 

 Bull. 101, pp. 5-6. 



•See U. S. F. S. Bull. 101, p. 32. 



