REFERENCES 23 



esting burns and other areas which are at present non-for- 

 ested, and which are either so far distant from seed trees or 

 suffer such unfavorable site conditions as to preclude the 

 possibility of natural restocking. 



The vast extent of barren areas due to clearcuttings and 

 fires, together with other open lands, will require many dec- 

 ades to reforest and will tax the capacity of all agencies to 

 supply necessary seeds, plants, labor and funds. These lands 

 are now unproductive. Artificial reproduction should be 

 largely confined for the next half century at least to reforest- 

 ing this type of land. Only in the regions where intensive 

 management is possible, and in which the proportion of open 

 unproductive land is small should artificial reproduction of 

 existing forests be undertaken. Here the funds for relatively 

 large initial outlay often are av ailable and the size of the pro- 

 jects are within the range of present physical limitations. 



Artificial methods of reproduction are most commonly ap- 

 plied when using the clearcutting method or in reforesting 

 open land. There is a field and a distinct need for artificial 

 regeneration under other reproduction methods intensively 

 applied to supplement natural reproduction by stocking the 

 blanks. 



REFERENCES 



1. Clapp, E. H. Silvicultural Systems for Western Yellow Pine. Prucecd- 

 ings of the Society of American Foresters, Vol. 7, 1912, p. 169. 



■z. TouMEY, J. W. Seeding and Planting in the Practice of Forestry. 

 Wiley & Sons, Inc., New York, 1916. 



3. Hunger, T. T. Natural versus Artificial Regeneration in the Douglas 

 Fir Region of the Pacific Coast. Proceedings of the Society of American 

 Foresters, Vol. VII, 1912, pp. 187-196. 



4. NiSBET, J. Studies in Forestry. Oxford, 1894, pp. 115-137 



Reuss. Hermann. Die Forstliche Bestandesbegriinding. Berlin, 1907, pp. 

 1-38. 



