(335) 



ships between the different forest types stand out very clearly, 



and are consistent throughout the season. 



The open station, as would be expected, shows a much higher 



rate of evaporation than any of the forest stations, and gives a 



measure of the protection which the forest canopy offers against 



heavy drains upon moisture. It must be remembered of course 



that the favorable influence of shelter from forces which raise the 



transpiration of plants is counterbalanced by the unfavorable 



effect of shade. 



TABLE I. 



Evaporation, Precipitation, Temperature, and Solar Radiation for Sta- 

 tions Included in the Hemlock Study, May 12 to September 21, 1923, 



Inclusive 

 Evaporation is the average daily in cubic centimeters for white atmometers; 



precipitation is the total in inches; temperature the average in degrees F.; solar 



radiation average daily in c.c. 



c . 





c 

 .2 ^ 



c 



X 



> ■>-> 



ca a; 



Z^ 



a 

 X3~ 



U 



Mb 



00 



cd o 

 o o 



Evaporation .... 



Precip. Totals 



Open 



Forest Stations 

 Interception . . 

 Interception % 



Temperatures 

 Air 



Max 



Min 



Mean 



Soil 

 Soil 6 in. 



Max 



Min 



Mean 



Soil 18 in. 



Max 



Min 



Mean 



Solar Radiation . 



23-3 



12.2 



9.0 



8.9 



12.0 



10.3 



7-5 



11.8 



11.8 



10.05 



89.9 

 49.2 

 69.S 



78.1 

 62.4 

 70.3 



67.4 

 62.6 

 65.0 



7-4 



10.05 



9.16 



.89 



9% 



10.05 



9-77 



.28 



3% 



10.05 

 10.20 



9.09 

 4.64 



4-35 



48^- 



/o 



9.09 



5-53 

 3-45 



38% 



11.78 

 7.82 

 3-96 



34% 



9.00 

 6.18 

 2.82 



31% 



9.00 



5-37 



3-63 



43% 



85.0 



S3-I 

 69.0 



66.4 



58.7 

 62.5 



61.9 



57-7 

 59.8 



84.7 

 53-8 

 69-3 



66.7 



58-9 

 62.8 



61.2 

 56.6 

 58.9 



81.6 



53-7 

 67.7 



68.4 



59-7 

 64.Q 



62.5 



59-1 



60.8 



80.6 

 50.1 

 65-4 



65.6 

 56.8 

 61.2 



59-5 

 57-6 

 58.5 



80.1 

 48.2 

 63-7 



62.6 



SS-6 

 59-1 



57-2 

 53-9 

 SS-S 



75-4 

 37-8 

 56.6 



59-3 

 47-5 

 53-4 



51.6 

 46.9 

 49.2 



81.7 



42.3 

 61.9 



62.8 

 Si-4 



S7-I 



56.1 

 51.8 

 54-0 



81.7 

 43-6 

 62.6 



62.5 

 51.8 

 S7-2 



57.2 

 52.7 

 5S-0 



i.o 



0.9 



I.I 



0.9 



0.3 



0.36 



0.45 



0.7 



The most interesting and significant feature of the chart is that 

 it shows the evaporation under the hemlock forest to be distinctly 



