76 



CIRCULAR 3 3 3, U.S. DEPARTMENT OF AGRICULTURE 



SYMBOLS USED IN 

 SAMPLE PLOT MAPPING 



-*? 



Plot corner 





Boundary post 



-*- 



Tree on line 



-i> 



Subplot corner 



m 



Quadrat 



A 



Transit station orhypsometer hub 



%L3 



Litter station 



ITss 



Soil station 



B-M. 



X 



1234 



Bench mark 



\ CP 3 



Camera point (arrow shows direction of view) 



°324 



Tree number 



A 



Triangulation station 





Road 



Woods or logging road 



= ==== 





Trail 



~" >aw " 



Skid trail 



==== = 



Chute 



= === = 



Skid trail with chute 



> > > > 



Flume —V-shaped 



w^i^ 



Flume — box-shaped 



=»__ 



Ditch (uphill side dashed) 



Railroad 





i i i i i i i 





Fence — barbed or smooth wire 

 Fence —mesh wire 





X 





Telephone line 

 Pipe line 



f_,_,_, 



t^/ 



Bridge 



T* 



6 



Tool shed or cache 



A. 



Shelter 



3l 



Cabin 



w* 



o 



E3 



f ■:'■; • ;:'; \: 



Sawmill 



Mine location 



Stream — living 



Stre a m - i nterm i tte nt 



Stream bed— dry wash 



Spring 



Stock water hole or tank 



Check dams across stream 



Gaging station 



Rock outcrop 



Logged areas dragged bare 



Logged areas partially denuded 



Firebreak — raked 



Firebrftak-raked and burned 



Slash — piled 



Slash— piled and burned 



Slash —spot burned 



Slash —lopped and scattered 



Slash —as it fell 



Slash — windrowed 



Slash —windrowed and burned 



Log 





Windfall 



* 



Dead tree 



k 



Snag 



.©■ 



Stump 



st? ~W~ 



Conifers 



£5' <£> 



Hardwoods 



BE 



Grass 



ES 



Marsh 



DESCRIPTION OF PONDEROSA PINE TREE CLASSES 



BY DUNNING 



AS DEVELOPED 



Seven tree classes are recognized, as follows (fig. 4) : 



Class 1 : Age class, young or thrifty mature ; position, isolated or dominant 

 (rarely codominant) ; crown length, 65 percent or more of the total height; 

 crown width, average or wider ; form of top, pointed ; vigor, good. 



Trees of this class are rarely over 30 inches in diameter even on good sites. 

 The bark is dark brown and roughly fissured into ridges or small plates. The 

 foliage is rich green in color and dense, owing to retention of the needles 

 of 3 to 5 seasons or more, except at the base of the crown. The needles are 

 often long and coarse, especially near the top. Terminal buds are large. The 

 top is pointed, owing to the rapid elongation of the terminal. Thrifty open- 

 grown young trees belonging to this class are, however, sometimes round- 

 topped because of excessive lateral growth of branches near the top. On the 

 other hand, slow-growing trees sometimes have pointed tops, due to weak de- 

 velopment of laterals. The annual whorls of branches and internodes are still 



30 Dunning's conclusions (20) have as a basis 20,000 individually numbered trees, on 

 25 permanent sample plots in uneven-aged stands, which were followed over a period 

 of 15 years, 



