Objective The paper aimed to analyze the spatiotemporal evolution characteristics of ecological land from the perspective of quantity-based quality, and to explore the coupling relationship between the quantity and quality of ecological land, which will help to promote regional ecological environment protection and sustainable development.
Method This paper introduced the landscape connectivity index, and proposed an improved comprehensive evaluation method of ecological land spatial-temporal evolution with quality-based quantity. The net change of ecological land in the study area and the ecological land change on quantity-based quality before and after the improvement were discussed.
Result The ecological land in the Greater Nanchang metropolitan area has been changing to non-ecological land, and the net area of ecological land has decreased by 1345.86 km². The ecological land in many counties and cities has been fragmented to varying degrees, and the stability of cultivated land and water area has decreased, and both QBQ values have decreased. Under the threshold distance of 1 km, the landscape connectivity of different types of ecological land in different counties and cities was significantly different. After improvement, the QBQ value of other ecological land showed a decreasing trend, except for the increase of the QBQ value of the water area.
Conclusion During the study period, the changes in the quantity and quality of ecological land in the Greater Nanchang Metropolitan Area showed a downward trend. By introducing the landscape connectivity index, we can deeply understand the changes in the quantity and quality structure of ecological land, so as to more truly reflect the actual change characteristics of ecological land.
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