基于景观生态风险评价的白洋淀流域景观格局优化研究

doi:10.19741/j.issn.1673-4831.2021.0796

Abstract

Abstract: Watershed landscape ecological risk assessment is the realistic basis of landscape pattern optimization, and landscape pattern optimization is one of the effective ways of watershed ecological environment restoration and maintenance. Taking Baiyangdian Basin as the study area, 11 indicators were selected from three aspects of nature, human activities and landscape factors. The spatial principal component analysis method was used to evaluate landscape ecological risk of the basin. The water body with an area of more than 0.001 km² and the forest land with an area of more than 0.005 km² were identified as the ecological sources in the basin. Based on the results of the risk assessment, MCR model and network structure evaluation method were constructed to optimize landscape pattern of the basin. The results show that, (1) Natural factors such as vegetation coverage and runoff have the most significant impact on landscape ecological risk in Baiyangdian Basin, and landscape factors have the least impact on ecological risk. (2) The landscape ecological risk of Baiyangdian Basin is relatively high. The high-risk regions are located in the southeast and northwest of the study area, and the low-risk areas are scattered in the forest land in the west. The total area of the extracted ecological source is 11 319.85 km², accounting for 35% of the total area of the basin. (3) The ecological network pattern composed of 39 ecological corridors and 21 ecological nodes has been constructed, forming road corridors, river corridors and green belt corridors. After optimization, it is found that the network closure, node connection rate and network connection degree of the landscape pattern are high, and the connectivity of landscape pattern has been significantly improved. The research of the landscape pattern optimization based on landscape ecological risk assessment is conducive to providing a scientific basis and decision-making reference for the comprehensive promotion of ecological environment maintenance and restoration in Baiyangdian Basin.

Key words: landscape ecological risk, landscape pattern, spatial principal component analysis, ecological network, Baiyangdian Basin

CLC Number:

X826
P901

GAO Xing, SONG Zhao-ying, LI Chen-xi, TANG Huai-zhi. Landscape Pattern Optimization in Baiyangdian Basin Based on Landscape Ecological Risk Assessment[J]. Journal of Ecology and Rural Environment, 2023, 39(2): 174-183.

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Landscape Pattern Optimization in Baiyangdian Basin Based on Landscape Ecological Risk Assessment

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