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随着我国西部地区农业的快速发展,碳排放对生态环境的影响不断变化。因此,评价西部地区种植业生产过程中碳收支情况,对于该地区低碳农业的发展有重要意义。基于我国西部12个省份1997-2012年农业相关统计数据,分析这些地区种植业生产系统的碳排放量和碳吸收量变化,结果表明:西部地区各省份种植业生产系统的碳排放量和碳吸收量均呈不断上升的趋势,年均增长量分别为368.8万t CO2-eq和4 138.3万t CO_2-eq。西部地区各省份种植业的平均碳排放量和平均碳吸收量分别介于51.7万~3 314.7万t CO_2-eq和524.7万~28 715.1万t CO_2-eq。在总的碳排放构成中,化肥的使用是种植业生产系统投入品碳排放的最大构成部分,平均占到45.7%,其次为农用柴油和灌溉。总体上,我国西部地区种植业生产系统的碳收支处于碳盈余状态,但各省份间差异较大。
With the rapid development of agriculture in western China, the impact of carbon emissions on the ecological environment is constantly changing. Therefore, evaluating the carbon budget in the process of crop production in the western region is of great significance to the development of low-carbon agriculture in the region. Based on the agricultural statistics from 1997 to 2012 in 12 provinces in west China, the changes of carbon emissions and carbon uptake in crop production systems in these areas were analyzed. The results showed that the carbon emissions and carbon uptake of crop production systems in all the provinces in western China The average annual growth was 368.8 million tons of CO2-eq and 4.1383 million tons of CO2-eq, respectively. The average carbon emission and the average carbon uptake of crop cultivation in each province in western China ranged from 517,000 to 31.447 million tons CO 2 -eq and from 5,247,000 to 287.115 million tons CO 2 -eq, respectively. In the overall composition of the carbon emissions, the use of chemical fertilizers is the largest component of carbon emissions from the inputs of crop production systems, accounting for an average of 45.7%, followed by agricultural diesel and irrigation. In general, the carbon revenue and expenditure of crop production systems in the western region of China is in a carbon surplus, but the differences among the provinces are quite large.