60 



BULLETIN 1105, U. S. DEPARTMENT OF AGRICULTURE. 



The area of root activity was represented by two sampling points, 

 one north and one south and east of a large group of trees. Both 

 were well outside the crown cover, beyond the zone of dense shade 

 and leaf litter, at a distance of about 30 feet from the base of the 

 nearest tree. The samples representing the area of no tree roots 



. r^'\ 



PrecipitaNon(inche3l 









!\ 







1 









: \ 















LEGEND 



Ar€3 0f root acTion.NE-side of Trees — 













1 









Precipitation 1 

 by decades • 



nchesl summed 



.0.7S 







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■. 



; 











/ 



\ 





'••••• 



.♦•*•• 







*•"'*' 



•. 



/ 



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*••.••** 





Depth ^^ In 

















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y^ 





^^N^. 



•♦.. 







,,--'' 















.-••' 









- — 





APR. 



MAY 



JUNE 



JULY 



AUGUST 



SEPT. 



OCT. 



Fig. 9. — Effect of cutting upon soil moisture, 1919. 



were taken at two points about 30 feet east of two large stumps and 

 75 feet from the nearest living trees. Abnormally heavy rainfall 

 throughout the season prevented securing decisive data, but never- 

 theless the results as shown in Table 16 and Figure 9 are significant. 

 In the 6-inch series, the samples taken on site 1, within the area 

 permeated by active tree roots, are consistently lower in moisture 



