【摘要】 对西宁都市圈不同地类的碳排放系数进行修正,采用2000、 2005、 2010、 2015、 2020年共5期Landsat影像数据,测算西宁都市圈土地利用的碳排放量.选择最大斑块指数等8个代表城市用地形态变化的指标,利用空间滞后模型及空间误差模型分析城市形态指标对碳排放量的影响.结果表明,与东部大城市相比, 2000-2020年西宁都市圈建设用地强度、总面积均较小,碳排放量增速平稳且缓慢.面积占比仅2.67%的建设用地是土地利用碳排放量的重要来源;与平原城市相比,西宁都市圈土地利用的碳排放量具有明显的方向性,扩张方向以西北、东南和正北为主,除中心区外,西宁都市圈土地利用的碳排放量空间上表现为星状或不规则的团状;耕地变化对碳排放量的影响不显著,建设用地面积和形态变化对都市圈的碳排放量具有明显影响;内部连通性高、破碎度高和形状复杂的建设用地具有较高的碳排放量,不规则的建设用地和内部主导建筑类型的集聚同样会导致地区碳排放量增加,建设用地的紧凑程度对碳排放量增长有抑制作用.揭示了土地利用形态对碳排放量的影响机制,提出了建议和对策.更多还原

【Abstract】 This paper corrected the carbon emission coefficients of different land types in the Xining metropolitan area, and used five phases of Landsat image data from 2000, 2005, 2010, 2015 and 2020 to measure the carbon emissions of land use in the area. Eight indicators representing urban land use morphological changes, including the largest patch index, were selected, and the spatial lag model and spatial error model were used to analyze the impact of urban morphological indicators on carbon emissions. The research results showed that, compared with the situation of big cities in the east of China from 2000-2020,the intensity and total area of construction land in the Xining metropolitan area were smaller, and the growth rate of carbon emissions steady and slow. Construction land, which accounted for only 2.67% of the area, was an important source of carbon emissions from land use. Compared with citiesin plain areas,carbon emissions from land use in the Xining metropolitan area had obvious directions, and the expansion directions were mainly northwest, southeast and straight north. Except for the central area, the carbon emissions from land use appeared as stars or irregular clusters in space. Changes in cultivated land had no significant impact on carbon emissions, while changes in the area and shape of construction land had a significant impact on carbon emissions in metropolitan areas. Construction land with a high internal connectivity, fragmentation and complex shapes had higher carbon emissions. Irregular construction sites and clustering of dominant internal building types also led to an increase in regional carbon emissions, and the compactness of construction sites had a dampening effect on the growth of carbon emissions. Then we revealed the impact mechanism of land use forms on carbon emissions and finally gave suggestions and countermeasures for the Xining metropolitan area.更多还原