Quadrat Method in Forestry Investigations 



29 



increase or decrease in specific cases, as well as invasion by new 

 species, should be plainly shown. By so doing, the effect of cli- 

 matic conditions and the particular management under considera- 

 tion may be clearly determined. 



The work involved in mapping and recording may be greatly 

 decreased in two ways, namely, (1) by charting only the com- 

 mercially valuable species and possibly those which figure strong- 

 ly in root or aerial competition, and (2) by combining the list 

 and chart methods as already stated. The value of these methods 

 lies not only in the decreased amount of work, but makes possi- 

 ble the mapping of much larger plots than where all vegetation 

 is charted. 



The results obtained from mapping according to the first 

 condition, i. e., taking into account only a few of the leading spe- 

 cies, is shown by the following figures obtained through the chart- 

 ing of a 3-meter square unit plot established in September, 1913, 

 and recharted in August, 1914. 



In this instance increment through vegetative means is 

 shown. This means of reproduction is most important where 

 there is keen competition, so the method in question has a high 

 value. 



A plot established according to the second method, i. e., by 

 the application of the chart-list plan, accompanied by the analysis 

 of the two most important commercial species, follows. The 

 sketch (Chart List Plot No. 26) represents the vegetative cover 

 as found in August, 1914. 



