基于土地利用变化的宝鸡市建成区碳排放估算研究

Research on carbon emissions of built-up area in Baoji City,Shaanxi,China based on land use change

目的揭示宝鸡市建成区2000-2013年碳排放变化规律。方法基于DMSP/OLS夜间灯光数据,确定土地利用变化阈值,并通过引入人口密度栅格数据,采用新方法估算宝鸡市建成区2000年和2013年碳排放量。结果(1)基于夜间灯光数据提取的2000年和2013年宝鸡市建成区面积分别为36 km^2和101 km^2,土地利用变化(城市扩张)的速度为4.64 km^2/a;(2)14年间,宝鸡市建成区人口密度峰值由渭滨区向金台区转移;(3)刻画了地级市内部基于栅格单元的碳排放空间分布格局;(4)2000年和2013年宝鸡市建成区碳排放强度均值分别为0.57万t/km^2和0.85万t/km^2,碳排放量增加了66.07万t,其中金台区增幅最多,为52.12万t。结论研究成果有望为宝鸡市或类似工业城市制定更精细的碳减排政策提供有益参考。

Purposes—To reveal the change rule of carbon emissions for the recent fourteen years in the built-up area of Baoji City,Shaanxi,China.Methods—Thresholds of land use changes were determined based on the DMSP/OLS nighttime light data,and on the basis of the introduced raster data of population density,carbon emissions in year 2000 and year 2013 in the built-up area of Baoji City was estimated with new method,respectively.Result—(1)The area of built-up area in year 2000 in Baoji City and year 2013 was 36 km^2 and 101 km^2,correspondingly,which were extracted from nighttime light data and the rate of land use changes(or expansion rate)was 4.64 km^2/a;(2)The maximum population density in the built-up area of Baoji City has been transferred from Weibin District to Jintai District in the past fourteen years;(3)Spatial distribution of carbon emissions within prefecture-level cities was firstly mapped on the basis of the cell sizes;(4)Intensity of carbon emissions in year 2000 and year 2013 in the built-up area of Baoji City was 0.57×104 t/km^2 and 0.85×104 t/km^2,separately.Carbon emissions have increased by 66.07×104 t in the past fourteen years,52.12×104 t of which,the maximum increase,occurred in Jintai District.Conclusion—The results are expected to provide a beneficial reference for the formulation of precise policies on carbon emission reduction in Baoji City or similarly industrial cities.