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Estimation of the Aircraft cO_2 emissions of china's civil Aviation during 1960-2009

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Advances in climate change Research 2012年第2期3卷 99-105页

作者： HE Ji-cheng XU Yu-Qing Division of Environment and Resources Research Transport Planning and Research Institute Ministry of Transport Beijing 100028 China National climate center China Meteorological Administration Beijing 100081 China

Based on data collected by chinese civil Aviation Statistic center, the annual cO2 emissions of aircrafts during 1960-2009 were calculated, and the emission intensity and its dynamic characteristics were analyzed. The results show that the total cO2 emissions of aircrafts in china increased from 120×10^3 t in 1960 to 41.44×10^6 t in 2009. The cO2 emission intensity decreased from 2.9 kg （converted t kra）-1 in 1960 to 0.96 kg （converted t km）-1 in 2009 at an average rate of 0.04 kg （converted t km）-I per year. The average share of cO2 emissions of aircrafts on the total cO2 emissions from the sector of transportation, storage and post was 6.6% during 1980-2005, and 0.25% on the total emissions from fossil fuel combustion during 1971-2008.

关键词： china civil aviation energy consumption of aircraft c02 emissions

Urbanization,economic growth,and carbon dioxide emissions in china:A panel cointegration and causality analysis

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Journal of Geographical Sciences 2016年第2期26卷 131-152页

作者：刘彦随严镔周扬 Institute of Geographic Sciences and Natural Resources Research CAS Key Laboratory of Regional Sustainable Development Modeling CAS college of Resources Science and Technology Beijing Normal University University of chinese Academy of Sciences

Elucidating the complex mechanism between urbanization, economic growth, car- bon dioxide emissions is fundamental necessary to inform effective strategies on energy saving and emission reduction in china. Based on a balanced panel data of 31 provinces in china over the period 1997-2010, this study empirically examines the relationships among urbanization, economic growth and carbon dioxide （cO2） emissions at the national and re- gional levels using panel cointegration and vector error correction model and Granger cau- sality tests. Results showed that urbanization, economic growth and cO2 emissions are inte- grated of order one. Urbanization contributes to economic growth, both of which increase cO2 emissions in china and its eastern, central and western regions. The impact of urbanization on cO2 emissions in the western region was larger than that in the eastern and central re- gions. But economic growth had a larger impact on cO2 emissions in the eastern region than that in the central and western regions. Panel causality analysis revealed a bidirectional long-run causal relationship among urbanization, economic growth and cO2 emissions, in- dicating that in the long run, urbanization does have a causal effect on economic growth in china, both of which have causal effect on cO2 emissions. At the regional level, we also found a bidirectional long-run causality between land urbanization and economic growth in eastern and central china. These results demonstrated that it might be difficult for china to pursue carbon emissions reduction policy and to control urban expansion without impeding economic growth in the long run. In the short-run, we observed a unidirectional causation running from land urbanization to cO2 emissions and from economic growth to cO2 emissions in the eastern and central regions. Further investigations revealed an inverted N-shaped re- lationship between cO2 emissions and economic growth in china, not supporting the envi- ronmental Kuznets curv

关键词： urbanization economic growth c02 emissions panel cointegration Granger causality

Regional Simulation of Soil Organic carbon Dynamics for Dry Farmland in East china by coupling a 1:500000 Soil Database with the century Model

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Pedosphere 2011年第3期21卷 277-287页

作者： WANG Shi-Hang SHI Xue-Zheng ZHAO Yong-cun D. c. WEINDORF YU Dong-Sheng XU Sheng-Xiang TAN Man-Zhi SUN Wei-Xia State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing210008 (China) Louisiana State University Agcenter Baton Rouge Louisiana 70803 (USA) Graduate University of chinese Academy of Sciences Beijing 100049 (China)

changes in soil organic carbon (SOc) in agricultural soils influence soil quality and greenhouse gas concentrations in the atmosphere. Dry farmland covers more than 70% of the whole cropland area in china and plays an important role in mitigating carbon dioxide (cO2) emissions. In this study, 4109 dry farmland soil polygons were extracted using spatial overlay analysis of the soil layer (1:500000) and the land use layer (1:500000) to support century model simulations of SOc dynamics for dry farmland in Anhui Province, East china from 1980 to 2008. considering two field-validation sites, the century model performed relatively well in modeling SOc dynamics for dry farmland in the province. The simulated results showed that the area-weighted mean soil organic carbon density (SOcD) of dry farmland increased from 18.77 Mg c ha1 in 1980 to 23.99 Mg c ha1 in 2008 with an average sequestration rate of 0.18 Mg c ha1 year?1. Approximately 94.9% of the total dry farmland area sequestered carbon while 5.1% had carbon lost. Over the past 29 years, the net SOc gain in dry farmland soils of the province was 19.37 Tg, with an average sequestration rate of 0.67 Tg c year1. Augmentation of SOc was primarily due to increased consumption of nitrogen fertilizer and farmyard manure. Moreover, SOc dynamics were highly differentiated among dry farmland soil groups. The integration of the century model with a fine-scale soil database approach could be conveniently utilized as a tool for the accurate simulation of SOc dynamics at the regional scale.

关键词： agricultural soils c02 emissions greenhouse gas soil organic carbon density soil quality