Table 9 Biodiversity indicator rating criteria.

From: Spatio-temporal evolution and coupling relationship between biodiversity and urbanization in the areas along the Yellow River of Shandong province

BI rating

State of biodiversity

BI < 0.40 (IV)

There are poor species, poor habitat quality, single and fragile ecosystem types, and extremely low biodiversity

0.40 ≤ BI < 0.50 (III)

There are fewer species, fragmented landscapes, moderate habitat quality, frequent human disturbance, and moderate biodiversity level

0.50 < BI ≤ 0.60 (II)

There are abundant species, good habitat quality, more ecosystem types, and rich biodiversity in local areas

BI ≥ 0.60 (I)

There are highly abundant species, high habitat quality, diverse ecosystems, sparse human activities, and suitable for biological survival

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