FISHERIES, GAME AND FORESTS. . 



427 





















TOTAL USE OF 



WATER 







PLANT 



WATER. 



INCHES 



PER DAY. 

 INCHES 



Sunflower, 







15.2 



O.I3O 



Cabbage, 











„ 







14.4 



0.I20 



Vineyard, 



. 















4.0 



O.O3O 



Hop vine, 













= 







5-6 



O.05O 



Clover and oats 



(mixed), 











. 







12.7 



O.O98 



Grass, . 



















14.0 



O.080 



Beech trees, . 













. 







9.2 



O.O5O 



Mixed forest, . 













, 







3-8 



0.02I 



White poplar, 













• 







7-7 



O.05I 



Long grass, . 





















40.7 



0.l66 



Short grass, 



















27.4 



O.I I 2 



The figures for long grass and short are based upon the determination made at 

 Emdrup, Denmark, as cited on a previous page, and include the months from 

 March to October, inclusive. 



FOREST DATA. 



Elaborate investigations on transpiration of forest trees were made by F. B. Hohnel 

 at the Austrian Experiment Stations, in 1878, an abstract of which may be found in 

 Bulletin No. 7, Forest Influences. From the figures there given, it appears that forest 

 transpiration from day to day has a wide range. Thus, a birch standing in the open, 

 and having 200,000 leaves, was calculated to have transpired on hot summer days 

 from 700 to 900 pounds of water, while on other days not more than eighteen to 

 twenty pounds. A thirty-five-old beech tree with 3,000 leaves, was computed to 

 transpire about 2.5 pounds per day from June to November. Assuming that 1,600 

 such trees might be found on an acre, the total transpiration might amount to about 

 600,000 pounds per acre, for each growing season of 150 days. A fifty to sixty-year 

 old beech, with 35,000 leaves, transpired about twenty-two pounds daily, and with 500 

 such trees on an acre, the transpiration for 150 days would amount to 1,650,000 

 pounds. This latter figure is equivalent to 7.28 inches on ground area. 



The following table is derived from Hohnel's data given at page 79 of Bulletin 

 No. 7, Forest Influences: 



