FOREST INFLUENCES. 



329 



* Evaporation to Fields <E.O.) 



and Woods (E.W.) compared 



with Precipitation. (Pr.) 



WINTER. 



h Precipitation and 

 Evaporation 

 Deciduous 



SPRING. 



c Precipitation and 

 Evaporation 

 Evergreen. 



SUMMER 



(1 Precfptiation and 

 Evaporation. 

 Young Trees. 



AUTUMN. 



Fig 80 —Evaporation and precipitation. 



Fw. 81 — Monthly evaporation in the fields (upper curve) and ^uoods (lower curve) 



Fig 82 —Percentage of evaporation in tho woods as compared with that m open fields 



100 



Fig. 83.™ Ratio of evaporation from water surface in field (upper curve) and forest (lower curve) to 



precipitation (top line). 



100 



























75 



























50 



■f "Z "-"bH 





■i*_.-- 



»•— «. „ 



















25 







.--•'" ••■». „ 



■* ~~ *"~ ~* 





<-^-- — 



———"■™ 



**-——.«. 



■ - 







~^> 









WINTER. 



SPRING 



SUMMER. 



AUTUMN 



,^._ EVERGREEN TREES. 



.- DECIDUOUS TREES 



YOUNG TREES, 



f |§, 8|,— Percentage of evaporation in w>&* tQ Xtoft m *&© open air. 



