海岸带城市蓝绿空间碳汇基础设施网络分析——以广西北部湾为例

Analysis of Carbon Sink Infrastructure Network for Blue-Green Space in Coastal Zone Cities：Take Beibu Gulf of Guangxi as an Example

关键词:  海岸带城市  蓝绿空间  碳汇基础设施  广西北部湾  形态学空间格局分析  电路理论

Key words:  coastal zone cities  blue-green space  carbon sink infrastructure  Guangxi Beibu Gulf  Morphological Spatial Pattern Analysis (MSPA)  circuit theory

摘要:

为探讨蓝绿基础设施(Blue-Green Infrastructure，BGI)碳汇服务功能有益于指引城市碳中和目标建设，本研究以广西北部湾海岸带城市为例，运用形态学空间格局分析(Morphological Spatial Pattern Analysis，MSPA)法、连通性分析法以及电路理论，构建蓝绿基础设施碳汇网络，讨论对应的固碳增汇对策。结果表明：2020年研究区蓝绿空间碳汇总量为735 524.09 tC·a^-1,其中绿色空间碳汇总量为588 680.06 tC·a^-1，蓝色空间碳汇总量为146 844.03 tC·a^-1,单位面积碳汇量“蓝”高于“绿”；共提取63个碳汇源地斑块，20个核心源地斑块，绿色空间核心源地总面积为6 814.31 km²，蓝色空间为899.05 km²,核心源地主要分布在东西两侧及南部沿海地带；共提取出24条生态廊道，绿廊共长122.21 km，蓝廊为52.75 km，呈环状分布，中南部地区分布较密，连通性强。本研究结果可为“碳达峰与碳中和”(简称“双碳”)背景下海岸带城市的保护与可持续发展提供建设思路。

Abstract:

Exploring the function of carbon sink services for Blue-Green Infrastructure (BGI) is beneficial to guide the construction of urban carbon neutrality targets.Taking cities in the coastal zone of Guangxi Beibu Gulf as examples,by using Morphological Spatial Pattern Analysis(MSPA),connectivity analysis and circuit theory,a BGI carbon sink network is constructed,and the corresponding carbon sequestration countermeasures are discussed.The results show that the total amount of carbon sinks in the blue-green space of the study area in 2020 was 735 524.09 tC·a^-1,of which the total amount of carbon sinks in the green space was 588 680.06 tC·a^-1,and the total amount of carbon sinks in the blue space was 146 844.03 tC·a^-1.The carbon sink per unit area is higher in “blue” than in “green”. A total of 63 ecological source patches and 20 core source patches were extracted.The total area of the green space core source was 6 814.31 km²,and the blue space was 899.05 km².The core source was mainly distributed in the east and west sides and the southern coastal area.A total of 24 ecological corridors were extracted,with a total length of 122.21 km for the green corridor and 52.75 km for the blue corridor,which were circularly distributed.The central and southern regions were densely distributed and had a strong connectivity.The results of this study provide construction ideas for the protection and sustainable development of coastal cities under the background of “carbon peak and carbon neutrality” (referred to as “double carbon”).