558 INTRODUCTION TO PLANT GEOGRAPHY [CHAP. 



to deterioration, so grazing must be by rotation and logging only 

 with due care, and there may have to be special conservation practices 

 such as contour furrows across slopes to maintain forage and protect 

 soil. This is quite good land for forestry or grazing but is some- 

 what limited for these purposes by shallow soil or steep slopes, or 

 by excessive wetness that cannot be remedied by drainage to permit 

 use for crops. Alternatively, in arid or semi-arid regions, there 

 may be limitation through lack of moisture. 



Fig. 17S.— An example of Class \'II land. (Phut. U.S.D.A.) 



VII. With severe restriction in use — land highly susceptible to 

 deterioration, so grazing must be only occasional and felling highly 

 selective (Fig. 178). On this land extreme care must be exercised 

 to prevent erosion as a result of pasturing or lumbering. 



C. Suitable for wildlife but uot for cultivation, pasture, or ivoodland 



VIII. With or without special practices — productive of useful wild 

 plants, fur, game Birds, Mammals, or Fish ; generally serving as 

 range for wild or semi-wild animals (Fig. 179)- Such land is usually 

 very rough or wet or susceptible to severe erosion. Or it may be 



