97 



EVAPORATION IN WOODS IN PER CENT. OF EVAPORATION IN THE OPEN. 



The difference in instruments used by Dr. Eberinayer or their exposure 

 is probalily the cause of the relatively sliLcht differences in the results. 

 One of the most striking features of the table is the retarding effect that 

 forest litter is seen to have upon tlie soil beneath. About seven-eighths 

 of the loss of water by evaporation is cut off l)y the forest and litter. The 

 stations of Prussia allow the following average for evaporatio'i, the amount 

 evaporated in the open field being called 100 : 



Under beech growth . 

 Under spruce growth. . 

 Under pine growth ... 

 From cultivated field. 



Other data from Prussia are alsd given which .sIidw that greater 

 amounts are lost by e.xaporation in the open than in the forest. Investi- 

 gations by Shimek (.'J4 ) in western and noi'thwestern Iowa show that 

 evaporation is nnich greater on prairie surfaces than in adjacent forests. 

 It must therefore be admitted that wastefulness by evaporation from the 

 ground is reduced by forest cover. 



[7—29034] 



