157. 



ment may be 

 taken in strips. 



They may ap- 

 pear even- aged, 

 but in cross- 

 section they 

 will look some- 



l like the 

 following 

 Sketch: 



This is Ac- 

 tually done in Europe. 



Another modification is snail patches of defective timber. Clear- 

 cut ti is actually used vfrien the forester gets 

 rid of this defective timber on tnose plots, and he prac- 

 t i eally re s to c.k 3 . 



If in 4 or ^ years he finds the same disease spreading 

 he way cut along the dotted lines. This cutting will 



really take the form of a atrip. So he has here changed from the patch 



to the atri^ method, but he has not changed to a new method; he has mere. 



modofied 1 neral method in regard to the shape and area and position 



of cut. 



A few definitions may be of convenience here: (U.S.F.S.) 



1) Grcrip method: a method of conservative lumbering in which 

 y;roa-s of youru 1 ; trees which have sprung up in openings caused by logging 

 insect dww , windfall, sncv/break, or other agency, are taken as atart- 

 ing points for the future forest; or if these are insufficient, small 

 openings are purposely made. Reproduction by self -sown seed from the 

 iturt itand at the edges of these groups is secured by careful cuttings 

 ich extend the groups until they join. 



; Patch method; The clean cutting of small patches to invite 

 reproduction by self-sown seed from the surrounding foreut. 



}) Strip method: That method of conservative lumbering in whic. 

 reproduction is secured on clean-cut strips by self-sown seed from the 



sd joining forect. 



4) Stand method: That method of conservative lumbering IB 



Ich reproduction is secured from self-sown seed by means of successive 

 cuttings made thruout the mature stand, thus leading to the production 

 of a new stand approximately even-aged. These successive cuttings encour 



9 seed production, dreate conditions favorable to the growth of seed- 

 Ung, and gradually remove the remaining crees of the mature stand as 

 tlie youn^: growth develops. 



In the West other modifications are used* Some- 

 times a whole eighty acres may be cut but in an irregular 

 f orm. 



Scattered seed trees method (Graves): Patches may be left 

 with seed trees, say 2 per acre, vould there be too many 

 seed trees to be a clear cutting? Hot with lodgepole pine. 

 With yellow pine 40-50 seed trees are too many for clear 

 cutting: it becomes the shelter-wood system, .^upersisor 



W.N.Miite, on the JUtterrot National forest, uses this scattered seed 



tree method. 



