saw>Rramm r M 



UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 1059 



Contribution from the Forest Service 

 WILLIAM B. GREELEY, Forester 



Washington, D. C. 



May 19, 1922 



RESEARCH METHODS IN THE STUDY 



OF FOREST ENVIRONMENT 



By 



CARLOS G. BATES, Silviculturist 



In Charge Fremont Forest Experiment Station 



and 



RAPHAEL ZON, Forest Economist 



CONTENTS 



Page. 



Introduction,. ." . . 2 



Measurement of Environmental Condi- 

 tions Affecting Vegetation 11 



Climatic Characteristics of Locality ... 11 



Natural Climatic Regions 11 



Data Obtained by the Weather Bureau. 11 

 Knowledge of Existing Stations Nec- 

 essary 12 



Periods of Growth and Rest 12 



Special Observations on Climate and Soil 



of Locality : . 13 



Location of Instruments for Study of 



Growth 13 



Location of Instruments for Study of 



Reproduction 13 



Air Temperatures 15 



Special Observations on Climate and Soil 

 of Locality— continued. 



Soil Temperatures 26 



Solar Radiation— Light 39 



Precipitation 60 



Soil Moisture and Soil Qualities . . 66 



Atmospheric Humidity 143 



Wind Movement . , 146 



Evaporation 151 



Phenology ....". 168 



External -Field Observations 170 



Internal or Physiological Observations 171 



Field Observations, Photographs, and 

 Maps 172 



Appendix ■ 175 



List of References 202 



WASHINGTON 



ING OFFICE 



1922 



