基于能源消费的江苏省土地利用碳排放与碳足迹

采用2003~2007年江苏省能源消费和土地利用等数据,通过构建能源消费的碳排放模型,对江苏省5年来能源消费碳排放进行了核算,并通过土地利用类型和碳排放项目的对应,对不同土地利用方式的碳排放及碳足迹进行了定量分析。结论如下:(1)江苏省能源消费碳排放总量从2003年的8794.24万t上升到2007年的16329.85万t,涨幅达86%。其中,终端能源消费碳排放占53.6%。(2)江苏全省土地单位面积碳排放从2003年8.24t/hm²上升到2007年15.53 t/hm²,增幅为88.5%。其中,居民点及工矿用地单位面积碳排放最大,为95.62 t/hm²。(3)江苏全省能源消费碳足迹大于生产性土地的实际面积,由此造成的生态赤字达1351.285万hm²。(4)不同土地利用类型的碳足迹大小顺序为:居民点及工矿用地＞交通用地＞未利用地及特殊用地＞农用地和水利用地,其中居民点及工矿用地的碳足迹高达10.89 hm²/ hm²。(5)江苏全省单位面积碳足迹也呈明显的扩大趋势,从2003年的0.938 hm²/ hm²上升到2007年的1.769 hm²/ hm²。

Carbon emission and carbon footprint of different land use types based on energy consumption of Jiangsu Province

The impact of anthropogenic activities on carbon cycle is fulfilled through land use change. It is helpful to study the impacts of land use change on carbon cycle through linking carbon emissions to different land use types. By using data of energy consumption and land use of Jiangsu province from 2003 to 2007, this paper estimated carbon emission by energy consumption through carbon emission model, and analyzed the carbon emission and carbon footprint of different land use types through linking carbon emission to different land use types. The conclusions can be drawn as follows.(1) Total carbon emission from energy consumption of Jiangsu province increased from 8792.24×10⁴ t (2003) to 16329.85×10⁴ t (2007) with an annual rate of 86%, of which carbon emission from terminal fossil energy use accounted for 53.6%. Because carbon emission from fossil energy use was the main reason for the increase of total carbon emission, developing clean energy and improving energy efficiency are the key methods to decreasing total carbon emission. (2) Per unit area carbon emission of Jiangsu increased from 8.24 t/hm² (2003) to 15.53 t/hm² (2007) with an annual rate of 88.5%, of which per unit area carbon emission from residential and industrial areas was the highest (95.62 t/hm²), indicating that dwelling districts and industrial parks were the regions that contributed carbon emission mostly. So, improving energy structure and improving energy efficiency of the above regions was crucial in carbon emission reduction. (3) Carbon footprint of energy consumption was greater than the area of ecological productive land, and the ecological deficit was 1351.28×10⁴ hm² in Jiangsu in 2007. It is indicated that the carbon absorption of terrestrial ecosystems of Jiangsu Province cannot compensate the carbon emission of energy use. So strengthening environmental protection and enhancing carbon sequestration rate could effectively decrease the carbon emission intensity. (4) The descending order of carbon footprint of different land use types was: residential and industrial area, transportation area, unused land and special use area, agricultural land and water conservancy area. So, adjusting the land use pattern and introducing carbon footprint and carbon emission reduction into land use planning is one of the effective methods to reduce regional carbon footprint. (5) Per unit area carbon footprint of Jiangsu increased from 0.938 hm²/hm² (2003) to 1.769 hm²/hm² (2007), which indicates that the carbon footprint of land use had been expanded since 2003.