Title: American forests
Identifier: americanforests12natiuoft (find matches)
Year: 1906 Authors: National Irrigation Association (U. S. ); New Jersey Forestry Association; South Jersey Woodmen's Association; American Forestry Association
Subjects: Forests and forestry -- Periodicals
Publisher: Washington (etc. ) American Forestry Association (etc. )
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: MSN

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446 FORESTRY AND IRRIGATION October In the semi-arid regions, what are the relations between moisture defi- ciency and seed production? In the same section, The Great Plains, what species are best adapted to planting and what is the proper treatment for each? What degree of shade does a given species require? How much shade will it tolerate ? How do these factors vary with the age of the trees and in different situations? These questions orable, with the cost and advantage of changing natural types of forest, with the relations that exist between the members of various forest types. It will not be supposed that work in any direction must halt until each question is answered. Daily work in the forest helps to answer them. Nev- ertheless, something more is required and the method of sample plots is re- sorted to. These are called permanent sample plots when they are established
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Permanent Sample Plot in a Western Yellow Pine Pole Wood to Determine the Effect of Heavy Thinning. are vital to the production of forests anywhere, whether the seeding be nat- ural or artificial. What effect has frost upon the de- velopment of a plantation and a for- est? What is the relation of a given spe- cies to various soils, aspects, and alti- tudes ? Broader problems will deal with the possibility of establishing forests where conditions are extremely unfav- and maintained in such a way that every change which takes place within them can be observed and recorded. In practise it is necessary to find a place where every condition is as near- ly ideal as possible, and to lay off the plot so that everything affecting it shall be entirely normal. The area is usually rather small, rarely more than half an acre, because it is hard to find larger tracts having the necessary uni- fomitv, and hard to control them.

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