DOES EASTERN WHITE PINE OCCUR ON SITES IV AND V? 343 



Standards of yield-table construction are followed, the plots would even 

 more definitely fall under Site III, since the intervals between heights 

 of stands of different sites for the same age averages slightly larger than 

 that used in Bulletin 13. This is illustrated by comparing Schwap- 

 pach's Scotch pine heights with white pine heights in Bulletin 13. 



It is the opinion of the writer, based, however, principally on obser- 

 vation, general knowledge of the region, and the absence of con- 

 tradictory data, that white pine in naturally reproduced stands does 

 not occur in the Northeastern States on sand plains sufficiently poor 

 fall decidedly below Site III and make necessary a Site IV or V. 



Possibly certain areas of very poor sterile sand may be found not 

 originally covered with white pine and on which the tree does not 

 reproduce naturally. Stands artificially established on such soils might 

 fall decidedly below Site III, and make necessary a Site IV or V. 



The occurrence of white pine as a type in the Northeast is principally 

 below 1,500 feet, hence the poor sites of the upper slopes and moun- 

 tain tops are avoided. Throughout southern and central New England 

 pine has been planted over a wide range of soils ; in some cases on 

 very fertile soils originally occupied by hardwoods. 



On these best soils possibly growth averaging much better than 

 present Site I may be secured. If so, this would tend to raise the 

 values for Site I in the new yield tables needed for planted and 

 managed stands, and, thus broadening the total range of values, might 

 make necessary a Site IV. 



For the Lake States, Zon* and RecknageP have suggested the ex- 

 istence of Sites IV and V for white pine. A yield table for Norway 

 pine in the Lake States* shows a sufficiently wide range of volumes 

 (board feet, however) to justify four site classes.^ Will this hold 

 true for white pine? Unquestionably there is more basis for expecting 

 to find Sites IV and V for white pine in the Lake States than in the 

 Northeast. In the former region white pine is near the western limit 

 of its range and is growing under more adverse climatic conditions, 

 which must be reflected in the yield and development of the stand. 

 Precipitation, for example, is appreciably less than farther east. 



Until a series of plots is taken covering Lake States conditions, the 

 facts must remain undetermined. A most interesting field for inve.^^ti- 

 gation is offered. 



* Proceedings of Society of Amcricini rorcsters. Vol. XI, p. 441. 

 '"Norway Pine in tlic Lake States." lUilIctin 139, U. S. Dopt. of .•\Kri. 

 'Sec paf?e 8 of article by Rotli, Forestry Quarterly. Vol. XIV. 



