258 



PLANT SOCIOLOGY 



This N.S. quotient is: 



1. In deserts and desert steppes (arid soils poor in humus) to 100 



2. In regions of the Mediterranean red soil 50 to 200 



3. In regions of chestnut and black soils 100 to 350 



4. In the brown-soil region 275 to 500 



5. In the podsol region 300 to 1 ,200 



6. In regions of moor and tundra soils 400 to 600 



7. In regions of alpine humus soils 1 , 000 to 4 , 000 



Meyer constructed a N. S. quotient map of Europe (Fig. 127), and 

 its outlines have been found to correspond fairly well to a map of the 



w js JO zs u IS UendignOyGftenwieh is zo is 30 3S 10 14s so ss so e) 70 



.Ov.Gresnivicfi 



Fig. 127.— a humidity factor (N. S. quotient) map of Europe. (.4/ier Meyer.) 



same continent showing the major soil types (Fig. 128). Using similar 

 methods, Jenny (1930) has constructed a N. S. quotient map of the 

 United States (Fig. 79) and also has mapped the major soil types of 

 the same country (Fig. 129). These two sets of maps show the close 

 correspondence between the climatic factors and the distribution of 

 the climatic soil types. 



