130 THE STUDY OF PLANT COMMUNITIES ' Chapter VI 



TABLE 8. Light measurements, in foot candles, made with a Weston 

 photometer in a mixed pine-hardwood stand between 12:00 and 1:00 P.M. 

 when full sunlight was 9,500 foot candles. Readings taken along three lines, 

 at three-foot intervals, at a height of three feet. After completion of a line, 

 the measurements were repeated at the same points. Note the great variation 

 in readings at the same points at different times (sun flecks) and that some 

 points are apparently much less shaded than others. 



Average for the stand = 560 ft. candles. 5.9% of full sunlight. 



be some question of the advisability of generalizing as to plant 

 responses in relation to the measurements they obtain. In most 

 field studies this does not become a serious limitation because the 

 usual objective is to compare relative intensities of light in two or 



