Table 2. --Age distribution of trees taller than 2 m on the eight -plots 



Age class 



SI S2 S3 S4 



PI 



P2 



P3 



Ml 



Years 

 41-60 



1 1 



1 









61-80 



17 6 9 — 







4 





81-100 



10 9 9 1 



6 



1 



6 





101-120 



--9 5 5 



10 



2 



8 



1 



121-140 



16 2 2 



12 



2 



5 



3 



141-160 



3 14 1 1 



6 



1 



16 



2 



161-180 



--12 3 2 



2 



2 



10 



6 



181-200 



11— 2 



1 







9 



201-220 



2 



3 



1 



1 



6 



221-240 



1 



5 



2 





5 



241-260 



— — 2 1 



6 



2 





4 



261-280 



— — 1 2 



4 



6 





15 



281-300 



2 



1 



2 





9 



301-320 



4 



1 



3 





4 



321-340 





2 







1 



341-360 



2 



1 



4 





1 



361-380 



4 



1 



1 







7Qi /inn 

 .50 1 - 4UU 







1 



- 





401-420 













421-440 













i oral 



XX C7 XA XX 



62 



30 



50 



DO 



The fifth plot 

 nearly identical to 



(P3) was selected in a younger 

 that of plot S2 and similar to 



stand. Its age structure was 

 the other two Sweetwater plots 



meas 



ured in 1977. 



On the basis of age structure, the eight plots can be divided into two groups: 

 four relatively young and four relatively old. The four older plots have an all-age 

 structure, but few young trees. The younger plots show a tendency toward all -age 

 structure. Plot S3 is considered young even though it had four old trees that apparently 

 had been left when it was cut over in the 19th century. 



3 



