UNITED STATES DEPARTMENT OF AGRICULTURE 



DEPARTMENT BULLETIN No. 1233 



Washington, D. C. T October 6, 1924 



FOREST TYPES IN THE CENTRAL ROCKY MOUNTAINS 

 AS AFFECTED BY CLIMATE AND SOIL 



CARLOS G. BATES, Silviculturist 



Fremont Forest Experiment Station, Forest Service 



CONTENTS P,je 



Introduction 1 



The method of study 4 



Description of the localities studied 7 



The growing season 25 



Absolute and comparative conditions in the various forest types 27 



Air temperatures 27 



Wind, humidity, and evaporation J . . . 52 



Soil temperatures 84 



Sunshine ^ 112 



Precipitation 116 



Soil moistures 121 



Recapitulation .\ 132 



General character of the climate 132 



Temperatures and temperature gradients 134 



Wind, humdity, and evaporation 136 



Winter soil temperatures 137 



Precipitation and sol moisture 139 



Conclusions 141 



Applications 150 



Literature cited -152 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1924 



