How can the landscape ecological security pattern be quantitatively optimized and effectively evaluated? An integrated analysis with the granularity inverse method and landscape indicators.

Dongjie Guan,Lidan Cheng,Yanan Jiang

doi:10.1007/s11356-021-16759-1

Abstract

The optimization of the landscape ecological security pattern aims to construct a suitable ecological environment and promote the harmonious development between humans and nature. The optimization model of the ecological security pattern for the main urban area of Chongqing was constructed with the granularity inverse method, minimum cumulative resistance model, and spatial network analysis method. We used ecological nodes to optimize the landscape ecological security pattern by organically combining the landscape quantity and spatial structure, and analyzed the effectiveness of the optimized pattern. The results were as follows: (1) The optimal granularity for selecting the ecological source in the study area was 500 m. There were 220 ecological sources with a total area of 188691.03 hm2 and a minimum area of 75.15 hm2. (2) The ecological buffer zone, protection and utilization zone, key development zone, coordinated control zone, and restricted development zone accounted for 57.78%, 20.87%, 12.36%, 6.48%, and 2.50%, respectively, of the total area. (3) The construction of the landscape ecological security pattern contained 70 ecological corridors with a total length of 415.89 km. The longest and shortest ecological corridors had lengths of 20.33 km and 1153.23 m, respectively. There were 17 ecological nodes of corridor-resistance and 27 ecological nodes of corridor-corridor. (4) 41 ecological node service areas were constructed, with a total area of approximately 236.0723 hm2, accounting for 0.04% of the total study area, and the largest and smallest ecological node areas were 6.0744 hm2 and 0.0057 hm2, respectively. (5) The optimized result of the landscape ecological security pattern converted 209.1384 hm2 of nonecological land into ecological land.

Highlights

Ecological security refers to the normal operation of the ecosystem in a specific region, the sound development and supply-demand balance of the environment, resources and human security in the ecosystem, and the social situation with human beings as the main body is not threatened by the external factors (Falkmark 2002; Folke 2002; Molden 2002; Geoffrey and Matthews 2002; Rajagopal 2002; Sendama and Granit 2002)
The proportion of ecological land increased significantly and the fragmentation of landscape decreased after optimization, which indicated that the optimization was effective and provided rational reference for urban landscape ecological planning
(1) Taking the ecological land in the main urban area of Chongqing as the research object, the ecological landscape types determined by the ecological benefit analysis are selected, and the ecological landscape component structure is generated according to different granularity

Summary

Introduction

Ecological security refers to the normal operation of the ecosystem in a specific region, the sound development and supply-demand balance of the environment, resources and human security in the ecosystem, and the social situation with human beings as the main body is not threatened by the external factors (Falkmark 2002; Folke 2002; Molden 2002; Geoffrey and Matthews 2002; Rajagopal 2002; Sendama and Granit 2002). Different landscape ecological patterns have different responses to the improvement or degradation of ecological processes (López et al 2020)

Objectives

Methods

Discussion

Conclusion