Longitudinal zonality refers to the phenomenon that zonal soils extend along the meridian in the direction of east and west and change gradually along the latitude in the direction of north and south.
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Which of the following statements about the buffer curve and acid dissociation constant are correct?
A. The shape of the buffer curve can reflect the magnitude and scope of the soil buffer capacity
B. Different soils have different buffer curves
C. The acid dissociation constant is the pH at the midpoint of the buffer zone
D. The acid dissociation constant of 0-4 belongs to weak acid
In the soil pH classification, the corresponding pH range of the acid grade is:
A. 5.5-7.5
B. 4.5-7.0
C. 5.0-7.0
D. 5.0-6.5
The main influencing factors of soil acidification donot include:
A. Biology
B. Parent material
C. Time
D. Climate
Which of the following statement about soil buffer capacity is correct?
A. The amount of acid or alkali that needs to be added to cause the soil pH change
B. The smaller the buffer capacity, the easier the soil pH changes and the weaker the buffer capacity
C. For different soils, their buffering capacities are similar
D. The requirement of acid or alkali to change the unit pH cannot be estimated through the buffer curve
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