论文名称：Carbon emissions induced by cropland expansion in Northeast China during the past 300 years
发表刊物：SCIENCE CHINA Earth Sciences
关键字：cropland expansion, carbon budget, 300 years, Northeast China
摘要：Assessments of the impacts of land use and land cover changes (LUCC) on the terrestrial carbon budget, atmospheric CO2
concentration, and CO2-related climatic change are important to understand the environmental effects of LUCC and provide
information about the effects of historical carbon emissions. Using regional land cover reconstructions from historical records,
with a bookkeeping model, we estimated the carbon sink changes caused by historical cropland expansion in Northeast China
during the past 300 years. The conclusions are as follows: (1) There was a dramatic land reclamation of cropland during the
past 300 years in Northeast China. Approximately 26% of the natural land was cultivated, and 38% of the grassland and 20%
of the forest and shrubland were converted to cropland. (2) The carbon emission induced by cropland expansion between 1683
and 1980 was 1.06–2.55 Pg C, and the estimation from the moderate scenario was 1.45 Pg C. The carbon emissions of the soil
carbon pool was larger than that from the vegetation carbon pool and comprised more than 2/3 of the total carbon emissions.
(3) The carbon emissions of the three provinces in Northeast China were different. Heilongjiang Province had the largest carbon emissions, and Jilin Province had the second largest emissions. (4) The primary source of carbon emissions was forest
reclamation (taking 60% of the total emissions in the moderate scenario), the secondary source was grassland cultivation (taking 27%), and the tertiary sources were shrubland and wetland reclamation (taking 13%). Examination on the data accuracy
revealed that the high-resolution regional land cover data allowed the carbon budget to be evaluated at the county level and
improved the precision of the results. The carbon emission estimation in this study was lower than those in previous studies
because of the improved land use data quality and various types of land use change considered.
全部作者：YE Yu,ZHANG XueZhen
第一作者：LI BeiBei
通讯作者：FANG XiuQi
卷号：57
期号：9
页面范围：2259–2268
是否译文：否
发表时间：2014-07-27