14 BULLETIN 1233, U. S. DEPARTMENT OF AGBICTJI/TURE. 



The forest surrounding Station F-9 may be depicted by reference 

 to a tabular statement for an area of 0.942 acres, at the center of 

 which the station is situated. This shows a total of 1,143 trees 

 over 4.5 feet in height, of which 367, or 32.1 percent, are Douglas 

 firs. The firs comprise OS. 6 per cent of all the trees over 4 inches 

 in diameter at breast height, but only IS. 8 per cent of those below 

 this size. In contrast. Engelmann spruce comprises only 22. G per 

 cent of the larger trees, but 47.4 per cent of the smaller ones. This 

 relative status of the two species would indicate, without further 

 evidence, that Douglas fir is unable to hold its own under the dense 

 canopy of the larger trees. That this crowding out of the Douglas 

 fir is not due to lack of seeds, is repeatedly shown by the compara- 

 tively large number of fir seedlings which germinate, but soon die. 

 For example, in the new crop of seedlings in 1916 there were 1,183 

 Douglas firs and only 334 Engelmann spruces. After a few years 

 only about a 3:2 ratio of the two species exists among the small 

 seedlings. In the half-cut plots adjacent, where the canopy is not 

 over one-third as dense, there were practically no spruce seedlings, 

 but there was about the same number of firs. This may be due 

 either to the differences in physical conditions, or to the complete 

 removal of spruce seed trees from the cut-over plots, though it 

 would seem that considerable spruce seed might be blown in. Al- 

 though fir, because of its control of the canopy, may initiate a large 

 part of the new seedlings each year, there is little doubt that the 

 survivors are mainly of spruce. In other words, the conditions 

 being measured at Station 9 are those conducive to spruce survival. 



The equipment of Station 9 has been maintained almost con- 

 tinuously, so that the conditions at Stations 7-8, 14, or \5 might be 

 compared with the conditions at this station, as a secondary control 

 for any period. The record follows. All atmospheric observations 

 have been at an elevation of 1 foot. 



1 and 4 foot soil thermometers, in iron pipes, July 10, 1014. to April, 1920, 

 with tiie exception of March, 1916. 1-foot iron pipe re-placed by wooden tube 

 April 26, 1918. 



Soil well in use from July 13, 1914, to end of 1917, during open season, giving 

 weekly records of soil moisture at 1, 2, and 3 foot depths, and during 1917 at 

 the surface. 



Maximum and minimum thermometers, on tree, September, 1915, to Sep- 

 tember, 1918, excepting March. 1916. 



Air thermograph, under partial shelter, April 1, 1916, to December 31, 1917. 



Psychrometer, April 23, 1916, to December 31, 1917. 



Anemometer, April 23, 1916, to December 31, 1917, with register most of time. 



8-inch rain gage, April 6, 1916, to December 31, 1917. 



Evaporimeter, inner-cell, Type 2, April 1 to December 31, 1916. 



Evaporimeter, inner-cell, Type 4, January, 1917, to April, 1920. 



F-ll: Foxpark Plateau lodgt pole j>'me. —Elevation, O.OOOfeet ; aspect, 

 S. ; slope, about 5 per cent. The station is situated within the forest, 

 bui only about 50 feet from the edge of it, where it opens out abruptly 

 into a grassy bog or park bordering Foxpark Creek. This station 

 is barely 10 feet above the creek level. As the cover has been con- 

 siderably lightened by the cutting of trees in the rahger station yard, 

 it is altogether probable that the summer temperatures represent 

 about a mean between those of the dense Lodgepole forest ami those 

 of the much warmer glades. As winter temperatures are more 

 Largely controlled by strong winds and a deep snow blanket, they 

 would be intle affected. See PL IV, fig. 2.) The soil at this point 



