CLASSES OF GROWTH DATA, CHART GROWTH STUDIES 333 



Studies — Continued 



Office records 



Final data obtained 



Application to forest 

 areas 



Data derived from the 

 investigation 



4. Tally of trees with 

 suppressed crowns or 

 those apt to die 



As applied to forest areas 



1. Stand table by diam- 

 eter classes 



2. Growth from diam- 

 eter and height 

 growth and volume 

 tables 



3. Correction for loss in 

 numbers of trees 



Source of inaccuracy is in 

 determining mortality 

 per cent, hence cannot 

 be applied to long 

 periods 



1, 2, 3 and 4 same as VII|] 

 5. Partial stem analyses] 

 for current growth in 

 volume on sample 

 trees as check on effect 

 of increased growth at 

 stump— § 290 



Probable growth in 

 volume of trees left on 

 cut-over areas 



2. Proportion of stand 

 showing increased 

 growth— § 337 



3. Loss in numbers and 

 net growth in volume 



Future growth of trees 

 by comparison with 

 growth attained by 

 trees on areas after cut- 

 ting 

 Growth on forest areas 

 1, 2 and 3 same as VII 

 4. Per cent of stand 

 showing increased 

 growth— § 337 



Effects of 



— expansion of areas 

 of crowns and in- 

 creased growing 

 space 



— c ompetition of 

 species left after cut- 

 ting 



— degree of severity of 

 cutting on remaining 

 stand 



III or IV— § 321 



Areas In each age class lorSame as III or IV — 5 322 

 timber left on cut-over a 



Volumes In each age 

 § 339 



Minimum or conservative 



yields on cut-over areas 

 Xo Increased growth assumed 



Conditions would coincide 



with cutting of even-aged 



stands 

 Results contrasted with VIII 



as check on that method of 



prediction 

 Safe for application to long 



periods 



I 

 1. Individual record of 1. Permanent record of 1. Location of plots with 



each tree on plot by 

 number, compared for 

 successive measure-' 

 ments at five- or ten- 

 year intervals ' 



Record of conditions 2. Causes and extent of 

 and of external 

 fluences 



changes in volume, 

 number of trees, and 

 dimensions for plot 



damage 



in control strips on 

 areas showing typical 

 conditions to be 

 studied 



Current growth, measure- 

 ment of all factors of 

 change in stands under 

 conditions selected — 

 § 340 



Yield tables for stands 

 grown under manage- 

 ment. Ultimate solu- 

 tion of all growth prob- 

 lems — § 313 



Diameter growth for trees 

 of separate classes, by 

 diameters, and crowns 

 — § 275, § 276, § 277 



Effect of spacing or thin 

 ning upon volume 

 growth and upon aver 

 age sizes and quality of 

 individual trees — § 301 



Stand tables by diam 

 cter classes 



Ages of stands. The 

 data are applied inten- 

 sively to individual 

 stands in silviculture 



Proper spacing for plan- 

 tations 



Character, and frequency 

 of thinnings 



Class of material to grow 



Character of initial natu- 

 ral stocking desired 



Growth per cent on stand- 

 ing trees — § 330 



