400 NORMAL YIELD TABLES FOR EVEN-AGED STANDS 



1. Location of plot. Region, watershed or block, section or forty. 

 Relocation is not contemplated from this description. 



2. Density of crown cover. This has in some studies been used 

 in an attempt to reduce the area to a fixed standard of density; e.g., 

 a stand showing .9 crown density would be considered as the equivalent 

 of but .9 of a full yield on the plot. The element of judgment thus 

 introduced is dangerous and had best be omitted. 



3. Altitude: 



Absolute — approximate. 



Relative — with respect to nearest stream, when it affects the 

 quality of site. 



4. Aspect — as affecting exposure. 



5. Degree of slope. 



6. Geological formation. 



7. Soil, kind, depth, consistency and degree of moisture. 



8. Origin of stand, whether from sprouts or from seed. 



9. History of stand. 



10. Condition of stand with respect to evidence of damage caused 

 by fire, insects, wind or other agencies should be especially noted. 



11. Exposure to winds, degree and character. 



12. Amount and character of tree reproduction on the ground. 



13. Herbaceous and shrubby vegetation under the timber. 



Record of Data for each plot. The data of permanent value for each 

 plot are, 



1. Area, in acres. 



2. Age. 



3. Total number of living trees, by species. 



4. Number of living trees above merchantable diameter limit, by 



species. (This may be shown for two diameter limits, as for 

 cordwood and saw timber units.) 



5. Average diameter (from diameter of tree of average basal area, 



or volume) (§ 242). 



6. Height of dominant trees, or dominant height of stand; total; 



merchantable. 



7. Total basal area at B. H. of trees per acre, in square feet. 



This is a valuable index to density of stocking. 



8. Yield per acre, in cubic feet, total. 



9. Yield per acre, in merchantable units, to given top diameters 



and stump heights. 



10. Dead standing trees, number or per cent. 



11. Density of crown cover. 



12. Description of plot. 



