Xi Feng-ming, Liang Wen-juan, Niu Ming-fen, Wang Jiao-yue
Ying Yong Sheng Tai Xue Bao. 2016 Feb;27(2):577-84.
Carbon emissions due to land use change have an important impact on global climate change. Adjustment of regional land use patterns has a great scientific significance to adaptation to a changing climate. Based on carbon emission/absorption parameters suitable for Liaoning Province, this paper estimated the carbon emission of land use change in the city and town concentrated area of central Liaoning Province. The results showed that the carbon emission and absorption were separately 308.51 Tg C and 11.64 Tg C from 1997 to 2010. It meant 3.8% of carbon emission. was offset by carbon absorption. Among the 296.87 Tg C net carbon emission of land use change, carbon emission of remaining land use type was 182.24 Tg C, accounting for 61.4% of the net carbon emission, while the carbon emission of land use transformation was 114.63 Tg C, occupying the rest 38.6% of net carbon emission. Through quantifying the mapping relationship between land use change and carbon emission, it was shown that during 1997-2004 the contributions of remaining construction land (40.9%) and cropland transform ation to construction land (40.6%) to carbon emission were larger, but the greater contributions to carbon absorption came from cropland transformation to forest land (38.6%) and remaining forest land (37.5%). During 2004-2010, the land use types for carbon emission and absorption were the same to the period of 1997-2004, but the contribution of remaining construction land to carbon emission increased to 80.6%, and the contribution of remaining forest land to carbon absorption increased to 71.7%. Based on the carbon emission intensity in different land use types, we put forward the low-carbon regulation countermeasures of land use in two aspects. In carbon emission reduction, we should strict control land transformation to construction land, increase the energy efficiency of construction land, and avoid excessive development of forest land and water. In carbon sink increase, we should improve forest coverage rate, implement cropland, grassland transform to forest land, strengthen forest land and water protection, and adjust cropland internal structure and scientifically implement cropland management.
土地利用变化导致的碳排放对全球气候变化具有重要影响。调整区域土地利用模式对于适应气候变化具有重大科学意义。基于适用于辽宁省的碳排放/吸收参数，本文估算了辽中城镇集中区土地利用变化的碳排放量。结果表明，1997年至2010年期间，碳排放和碳吸收分别为308.51太克碳和11.64太克碳。这意味着3.8%的碳排放被碳吸收所抵消。在土地利用变化产生的296.87太克碳净碳排放中，其余土地利用类型的碳排放为182.24太克碳，占净碳排放的61.4%，而土地利用转变的碳排放为114.63太克碳，占净碳排放的其余38.6%。通过量化土地利用变化与碳排放之间的映射关系表明，1997 - 2004年期间，其余建设用地（40.9%）和耕地转变为建设用地（40.6%）对碳排放的贡献较大，但对碳吸收贡献较大的是耕地转变为林地（38.6%）和其余林地（37.5%）。2004 - 2010年期间，碳排放和碳吸收的土地利用类型与1997 - 2004年期间相同，但其余建设用地对碳排放的贡献增加到80.6%，其余林地对碳吸收的贡献增加到71.7%。基于不同土地利用类型的碳排放强度，从两个方面提出了土地利用的低碳调控对策。在碳排放减少方面，应严格控制土地转变为建设用地，提高建设用地的能源利用效率，避免过度开发林地和水域。在碳汇增加方面，应提高森林覆盖率，实施耕地、草地转变为林地，加强林地和水域保护，调整耕地内部结构并科学实施耕地管理。
