Classification number

Content

A

Grass vegetation types are reduced, height becomes lower, vegetation cover is reduced, and the construct is simple.

B

The growth or development of the dominant plants in the grass is gradually debilitating, declining in number or yield, and gradually regressing or even disappearing.

C

Relatively well adapted, palatable vegetation declined, and virulent grass plants gradually increased and invaded.

D

An increase in the number of plants marking grass degeneration.

E

The deterioration of the natural environmental situation of grasses, which is characterized by severe surface saline alkalinization, aggravated wind (water) etching, an increase in the amount of soil surface gravel, and an increase in the compactness of the surface soils.

F

Detritivores such as ground rat pests increase, whereas their counterparts decrease. Scattered distribution of vegetation.