Periodical Literature. 305 



A series of investigations, executed at the 



Soil Austrian Experiment Station by Wallen- 



Moisture bock, concerns itself with determining the 



on soil moisture on north and south exposures, 



Different forested and unforested. Mere philosophy 



Aspects. sustains the following propositons : 



I. The soil of a clearing receives more 

 precipitation than the same under the old stand (17 to 32% being 

 intercepted). 



2. In the forest, the drying by moving air plays a greater role 

 than on the clearing (due to transpiration of the forest). 



3. On the clearing the drying out is primarily due to insolation. 



4. In wet years the drying out by insolation on clearings is 

 paralyzed by the frequent precipitation much more than in old 

 timber (the soil in the clearing has no time to dry out deep 

 enough). 



5. Precipitation on south slope does not measurably differ from 

 that on the south slope (in hill country). 



6. The evaporative power of moving air is not much greater 

 on south than on north slopes. 



7. Insolation and the dependent soil temperature are very much 

 greater on south than on north slopes. 



Corresponding to these conditions are the results of the investt 

 gations in soil moisture. 



1. Water contents of the soil on north and south slopes are in 

 rainy and rainpoor years greater on clearings than under beech 

 cover. 



2. In rainy years the clearing increases in moisture on south 

 slopes more, on north slopes less, than the soil under a beech stand 

 on the same slope. 



3. The difference in water contents of clearing and forested 

 soil is in rainy years greater on the sunny exposure, in rainpoor 

 years on the shady exposure. 



4. The difference in water contents of differently exposed 

 clearings is in dry years greater, in wet years smaller, than that 

 of differently exposed forest stands. 



Die Klimatischen Unterschiede auf Nord- und Sudlehnen in ihrer 

 Beziehung sum Wassergehalte des mit Althoh bestandenen und abge- 

 stockten Waldbodens. Centralblatt f. d. g. Forstwesen. February, 191 1. 

 Pp. 51-63- 



