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Brown calcic soil is distributed in the transitional zone of tropical arid steppe and desert. It has a thin brown humus layer and a grayish calcic layer. Gravels are usually present on the surface of such soils. Soil is alkaline with very little organic matter.

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Azonal soils are those which do not show zonal characteristics and maintain their own characteristics in any zone.

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Vertical zonality refers to the regular distribution and succession of soil types generated by the differentiation of biological and climatic zones due to the increase of altitude.

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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

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