Abstract
The contradiction between urban development and ecological environment protection is particularly obvious in rapidly expanding urban areas. It is necessary to build a reasonable urban ecological security pattern. to balance urban expansion and ecological security. This paper takes Zhengzhou as an example, based on spatial principal component analysis, a comprehensive assessment of urban ecological security is carried out by using natural characteristics, human characteristics, and natural and human interaction characteristics, and ecological sources are extracted; Based on the ecological corridors extracted by the minimal cumulative resistance (MCR) model, the edge-betweenness index is used to optimize the model, and redundant corridors are eliminated, the first-level ecological corridors and ecological nodes on the first-level ecological corridor are extracted. Through experiments, 25 important ecological sources, 24 first-level ecological corridors, and 32 ecological nodes were extracted. Important ecological sources, first-level ecological corridors and ecological nodes constitute the basic ecological security pattern of Zhengzhou, which effectively alleviate the contradiction between rapid urban expansion and ecological protection, and ensuring urban ecological security at the same time.
Highlights
With the rapid economic growth and expansion of cities, a series of ecological problems such as the reduction of habitat patches, serious landscape fragmentation, and loss of biodiversity have arisen [1,2].How to scientifically manage urban spatial growth and balance the contradiction between rapid urban expansion and ecological protection is an important guarantee for sustainable urban development
Under the current situation of rapid urban expansion, land resources are in short supply, and the construction of ecological corridors should eliminate redundant corridors while ensuring the safety of the urban ecological pattern
Based on the Minimal cumulative resistance (MCR) model, this paper introduces the betweenness index and extracts irreplaceable ecological corridors as the first-level corridors [6] to construct ecological corridors .which can take into account urban expansion and ecological security, and provide a reference for the construction of a rapidly expanding urban ecological security pattern
Summary
With the rapid economic growth and expansion of cities, a series of ecological problems such as the reduction of habitat patches, serious landscape fragmentation, and loss of biodiversity have arisen [1,2].How to scientifically manage urban spatial growth and balance the contradiction between rapid urban expansion and ecological protection is an important guarantee for sustainable urban development. The application to the construction of ecological corridors in larger areas has corridor redundancy problems [5]. Under the current situation of rapid urban expansion, land resources are in short supply, and the construction of ecological corridors should eliminate redundant corridors while ensuring the safety of the urban ecological pattern. Its built-up area has increased from 133.2km in 2000 to 443km in 2016, an expansion of 3.3 times [7] In this process, the contradiction between urban construction and the ecological environment has gradually increased [8]. This paper takes Zhengzhou City as an example to study and optimize the method of constructing the ecological security pattern of the rapidly expanding city
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