APPENDIX CRITERIA FOR RATING PRODUCTIVITY 



693 



Table 105. — Trees per acre and maximum distance 

 from observation point used in classifying existing 

 stocking in the redwood forest type group, Cali- 

 fornia Region 



Tree size 



Minimum 



trees per 



acre 



Maximum 

 distance 

 from obser- 

 vation point 



Under 6 inches high 



6 inches high to 12 inches 



d. b. h 



14 in. d. b. h 



16 



Number 

 500 



250 



234 



179 



141 



114 



80 



58 



45 



35 



29 



18 



13 



Feet 



7. 4 



7.4 



8 



9 



18 - --- --- 



10 



20 . -. -- - 



11 



24 .. 



13 



28 



15 



32 



18 



36 - - 



20 



40 



22 



50. - 



28 



60+ 



33 







western larch, and hemlock-Si tka spruce type 

 groups, and under some situations to the western 

 white pine type group, in the Pacific Northwest 

 Region. They were applied in the western white 

 pine type group when the species associated with 

 western white or sugar pine were representative of 

 the type groups just mentioned. If the species 

 associated with western white pine or sugar pine 

 were representative of the ponderosa pine type 

 group, standards for that type group were applied. 

 In neither situation was western white or sugar 

 pine considered as a seed source if the area under 

 examination was located outside blister rust con- 

 trol zones. 



The factors affecting prospective stocking in 

 these type groups were (1 ) adequacy of seed source, 

 (2) condition of seedbed, and (3) slope and ex- 

 posure. At each observation point not stocked, 

 the adequacy of seed source was examined and 



given a lumierical rating ranging from to 4. 

 Seedbed condition was assigned a rating of to 3, 

 and slope and exposure was given a rating of 1 to 

 3 depending on the degree of severity. These 3 

 separate ratings were then added together and if 

 tlie sum was 7 or more the point being examined 

 was classed as "stocking in prospect"; if the total 

 amounted to less than 7, the point was recorded 

 as "stocking not in prospect." Any point with 

 a zero seed source or a zero seedbed rating was 

 classed as "stocking not in prospect" regardless of 

 the rating assigned the other two factors. 



Seed-source standards. — The basis for classifying 

 seed source is summarized in table 106. The 

 second and third columns of this table show the 

 seeding distaiices considered effective in clearcut 

 areas where the seed source consists of surrounding 

 or adjacent timber. Columns 4 to 7 show the 

 relative effectiveness attributed to seed trees at 

 varying distances. The last column of table 106 

 shows the number of first-year seedlings considered 

 necessary to indicate prospects of successful future 

 stocking. Such seedlings, less than 1 year old, 

 have such a high mortality rate that they were 

 not judged to constitute satisfactory standards 

 for existing stocking. However, their presence 

 attests to the fact that seed reaches the point 

 locality. 



In applying table 106, the rating for "distance 

 to timber edge" was based on the distance to 

 the nearest timber edge, or, if two or more edges 

 were present, on the sum of the ratings for dis- 

 tance to the two nearest timber edges. If, in 

 addition, seed trees and first-year seedlings were 

 present, the rating value for seed from these 

 sources was added to that for "distance to timber 

 edge." Short timber, i. e., timber less than 150 

 feet tall, was required, in the judgment of the 

 field examiner, to be of seed-bearing size. In 

 no case was a total rating of seed source — either 

 separately or in combination with timber edge, 

 two nearest timber edges, seed trees or first-year 

 seedlings — given a value of more than 4. 



Table 106. — Classification of seed sources for the Douglas-fir and other type groups west of the Cascade 



summit in the Pacific Northwest 





Distance from point to 

 timber edge 



Number of st 



.andard seed trees by tree-height distance 

 class from point 



First-year 



Rating value 



Tall timber 

 (150+ feet) 



Short timber 



(under 150 



feet) 



0-1 



1-2 



2-3 



3-4 



seedlings on 

 4-milacre plot 



4 



Chains 



0-10 



11-20 



21-25 



26-40 



Chains 



0-5 



6-10 



11-15 



16-25 



Number 

 4 

 3 

 2 



1 



Number 

 11 + 

 8-10 

 5-7 

 2-4 

 1 

 



Number 

 32 + 

 23-31 

 14-22 

 5-13 

 2-4 

 



Number 



95 + 



68-94 



41-67 



14-40 



6-13 







Number 



3 - - 



3 



2 



2 



1 - 



1 



y» 









41 + 



26 + 















/ 



