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基于“斑块-基质-廊道”的南宁市碳汇空间格局构建
罗丁丁1, 覃盟琳2, 蒋红波1, 吴欣芋1, 刘曾涵1
1.广西大学林学院;2.广西大学
摘要:
实现城市碳平衡的关键在于维持城市土地利用结构类型与生态用地布局之间的平衡,因此构建符合实际情况的城市碳汇空间格局具有重要意义。以南宁市主城区为研究对象,利用生态网络技术中的“斑块-基质-廊道”构成要素,对碳汇用地景观格局、用地碳汇量进行分析,利用形态学空间格局分析(MSPA)提取出碳汇空间生态源地,基于最小累积阻力模型(MCR)得到碳汇最小累积阻力面并识别出碳汇廊道,形成城市碳汇生态网络,最终构建碳平衡理念下的南宁市碳汇空间格局。结果得到:(1)研究区碳汇空间生态源地主要用地类型为林地和草地;(2)碳汇空间生态源地总面积1380.87 km2,占研究区面积的21.49 %,主要分布在南部与北部地区,其中关键碳汇源地11个、重要碳汇源地16个,关键碳汇廊道21条,重要碳汇廊道23条,总计131.15km2,仅占研究区面积的2.03 %;(3)由碳汇空间生态源地、碳汇廊道和碳汇最小累积阻力面共同组成“一环-二心-多廊”研究区碳汇空间格局,解决区域碳汇生态安全问题,提升全域碳汇生态安全水平。研究结果以期为南宁市国土空间安全与建设工作提供理论支撑。
关键词:  碳汇空间  生态网络技术  MSPA  最小累积阻力面  南宁市
DOI:
分类号:TU98 P208
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目):基于碳通量反演模型识别的北部湾城市群碳储空间及其规划设计研究(52268008)
Construction of carbon sink spatial pattern in Nanning city based on "patch-matrix-corridor"
LUO-DINGDING,Qin-Menglin,Jiang-Hongbo,Wu-Xinyu,Liu-Zenghan
Abstract:
Under the framework of sustainable urban development, it is crucial to realize regional carbon balance, the core of which is to grasp the balance between the type of urban land use structure and ecological land layout. This balance is not only related to the quality of the ecological environment of the city, but also has a direct impact on the city's carbon emission and carbon storage capacity. Therefore, it is of profound significance to construct a scientific and reasonable spatial pattern of urban carbon sinks according to local conditions, in order to promote urban carbon balance and improve the quality of urban ecological environment. Taking the central city of Nanning as the study area, we constructed the spatial pattern of urban carbon sinks through the theoretical framework of "patch-substrate-corridor" in the ecological network technology, and comprehensively analyzed the landscape pattern of the urban carbon sinks and the net carbon sinks of the land. Based on the ArcGIS 10.6 working platform, the land use types in the study area were reclassified, and forest land, grassland, water body, shrubland and wetland, which are capable of generating natural carbon sinks with high carbon storage capacity, were taken as the foreground, while cropland, man-made surface and bare land were taken as the background, and the Morphological Spatial Pattern Analysis (MSPA) was used to obtain seven landscape types, which were used to identify the habitat patches that play an important role in the landscape connectivity in the study area. In order to accurately identify the habitat patches that play an important role in landscape connectivity in the study area, and whose analysis results can directly show the structural elements such as the area of the core area and the number of corridors, the core area was identified as a potential carbon sink, and landscape connectivity analysis was carried out for this landscape type to extract the spatial ecological source of carbon sinks. Based on the Minimum Cumulative Resistance (MCR) model, in order to realize the systematic and complete ecological network, we select the resistance factors that have a high degree of relevance to the ecological source of carbon sinks, such as elevation, slope, NDVI, and the current state of land use to construct the resistance surfaces, and combine them with the gravity model to identify the importance of the carbon sink sites and carbon circulation corridors, and then identify the key corridors, so as to construct the urban carbon pool network. Through the identification and analysis, the results obtained: (1) the main land types of carbon sink space ecological source land in the study area are forest land and grassland; (2) the total area of carbon sink space ecological source land is 1,380.87 km2 , which accounts for 21.49% of the total area of the study area, and it is mainly distributed in the south and north of the study area, and it contains 11 key carbon sinks, 16 important carbon sinks, 21 key carbon sink corridors, and 23 important carbon sinks. The total area of the study area is 131.15km2 , accounting for only 2.03% of the total area of the study area; (3) The spatial pattern of carbon sinks in the study area consists of carbon sink ecological sources, carbon sink corridors and the minimum cumulative resistance surface of carbon sinks, and it can solve the problem of ecological security of carbon sinks in the region, and improve the level of ecological security of carbon sinks in the whole region. The level of ecological security of carbon sinks in the whole region will be improved. The construction of the spatial pattern of carbon sinks in Nanning City based on the perspective of carbon balance takes into full consideration the actual situation of the main urban area of Nanning City, and theoretically provides strong support for the realization of the city's carbon balance. With the gradual implementation and improvement of the spatial security pattern of carbon sinks, Nanning City will achieve more significant results in realizing the urban carbon balance and improving the quality of ecological environment. This study not only provides a specific planning program for the spatial pattern of carbon sinks for Nanning City, but also provides experiences and ideas for other cities and even the global urban carbon balance and sustainable development, and the results of the study are intended to provide theoretical support for the work of Nanning City's territorial spatial security and construction.
Key words:  Carbon sink space  Ecological network technology  MSPA  Minimum cumulative resistance surface  Nanning City