A - River valley 
D B - Loess-covered sandstone hill 
à C - Sandstone hill 
€ D - Sand-mantled loess hill 
E - Sand-mantled rolling ground 
b/SHAGEDU rj 
[| 5 10% B 
km ——— 
À 
-— 
  
  
  
Figure 2 Land Systems of the Study Area. 
  
  
58 
58 
58 ) 
98 11 
11 - Cultivated and gently sloping 
98 13 
hillside 
15 - Grass-covered hillside 
98 - Rocky gully slope 
58 ) 58 73 - Cultivated farmland 
e 58 
15 
0 0.3 0.6KM 
———— 
58 
  
  
  
  
  
Figure 3 Land Units of a Sampling Area in the Sub- 
region of Loess-covered Sandstone Hill in Land 
System B. 
182