Table 5. — Timber inventory, photo and field classification of field samples 

 by land class, East Working Circle, Klamath National Forest 



, , ^, , Field classification of land 

 Land class Photo sample 



photo sample stratum Productive Unproductive 



forest forest Nonforest 



■Number of locations 



Productive forest 



1 



17 



~ 



— 



17 





2 



53 



5 







58 





3 



32 







32 





4 



23 



2 





25 





5 



28 



2 





30 





6 



13 







13 





7 



13 



1 





14 





8 



2 







2 



Subtotal 





181 



10 





191 



Unproductive forest 





6 



35 





41 



Nonforest 





3 



1 



12 



16 



Total 





190 



46 



12 



248 



Using study criteria to classify field samples 

 produced some interesting results. First, 15 of 

 the locations were taken at points on land iden- 

 tified on maps as noncommercial or nonforest. 

 These points were on patches of forest land 

 that were at least an acre in size but not con- 

 sidered suitable for timber growing. Second, 

 when stocking capability was considered, some 

 of the field locations initially classified as pro- 

 ductive forest land proved to be in the nonpro- 

 ductive category. 



An additional seven field locations taken on 

 forest land initially classified as productive for- 

 est land proved to be in the nonproductive cate- 

 gory when the current study criteria were used. 

 Also, five of the nine field locations taken on 

 nonproductive forest land and nonforest land 

 and classified by the original timber inventory 

 as productive forest land were also, folio v^dng 

 field examination, judged nonproductive by 

 the current study criteria. 



The productive land lost by reclassification 

 of field samples was not, however, as great as 

 the preceding discussion might suggest. This 

 was because much of this reclassified land had 

 already been excluded for other reasons. 



The classification of the field samples by use 



of study criteria is shovm in table 6. Area esti- 

 mates by classes of land and multiple use land 

 management zones following study procedures 

 are shovm in table 7. 



Table 7 shows these new estimates of pro- 

 ductive forest land area by multiple use man- 

 agement zone, excluding the patches described 

 above, as well as the area excluded because of 

 limited productivity. Of significance also in 

 table 7 is the area in travel and water influence 

 zones. Forest managers currently beheve that 

 management requirements will impose some 

 limitation on timber yields in these zones. 



Another significant factor in the manage- 

 ment of the timber resource of the East 

 Klamath is that some of the area is only poten- 

 tially usable because of land instability, prob- 

 lems of access, or silvicultural problems. Table 

 8 shows the area suitable for timber use outside 

 the crest zone available now and potentially 

 available with full yields and modified yields 

 expected. 



SINGLE SAMPLING PROCEDURE 



In the Pacific Northwest Region (Region 6) 

 a single field sample was used to estimate area 



28 



