Table 2 Classification of coupling coordination levels.

From: Spatiotemporal characteristics and influential factors of coupling coordination degree of urbanization and ecological environment in the Huaihe River ecological economic belt

System layer

Rule layer

Relative development status

Highly coordinated

Advanced coordination (0.8 < D ≤ 1.0)

Eco-environment development lag

(R > 1.1)

Urbanization development lag (R < 0.9)

Balanced development (0.9 < R < 1.1)

Transition period

Moderate coordination (0.6 < D ≤ 0.8)

Eco-environment development lag

(R > 1.1)

Urbanization development lag(R < 0.9)

Balanced development (0.9 < R < 1.1)

Low coordination (0.4 < D ≤ 0.6)

Eco-environment development lag

(R > 1.1)

Urbanization development lag (R < 0.9)

Balanced development (0.9 < R < 1.1)

Uncoordinated

Moderate imbalance (0.2 < D ≤ 0.4)

Eco-environment development lag

(R > 1.1)

Urbanization development lag (R < 0.9)

Balanced development (0.9 < R < 1.1)

Severe imbalance (0 < D ≤ 0.2)

Eco-environment development lag

(R > 1.1)

Urbanization development lag (R < 0.9)

Balanced development (0.9 < R < 1.1)

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