基于低碳经济的山东省德州市农田生态系统碳汇估算

Estimation of Carbon Sink in Farmland Ecosystem of Dezhou City in Shandong Province Based on Low-carbon Economy

依据2001—2010年农作物产量、耕地面积及农业投入等数据,对山东省德州市农田生态系统的碳汇进行了估算,并分析了其变化情况。结果表明,德州市2001—2010年农田生态系统的碳吸收总量呈增加的趋势,且2004年以来增加的趋势较明显;小麦、玉米作为主要的粮食作物,碳吸收量明显高于其他农作物,棉花作为主要经济作物,吸收量不高;2001—2010年,由于德州市发展生态、高效、优质农作物,碳排放呈现先增后减的变化;不同县市由于农业发展方向和发展特色的差异,具有不同的碳排放;在这3种途径的碳排放过程中,化肥施用过程中碳排放所占的比例较大,且呈减少的趋势;2001—2010年德州市碳吸收量为6.35×107 t,碳排放总量为4.53×106 t,碳吸收量远远大于碳排放量,说明德州市农田生态系统具有较强的碳汇功能。

Carbon absorption and emission in the farmland ecosystem of Dezhou City in Shandong Province were estimated and their changes were analyzed based on the statistical data of crop yield, cultivated land area and agricultural input from 2001 to 2010. The total carbon absorption in the farmland ecosystem showed an increasing trend during 2001--2010 and the increasing trend was obvious after 2004. The carbon absorption of wheat and corn, as the main grain crops, was significantly higher than other crops, and the carbon absorp- tion of cotton, as the main cash crop, was not high. The carbon emission presented the trend from increasing to decreasing due to eco-efficient and high-quality crop development. Different counties had different carbon emissions because of different agricultural development directions and characteristics. The carbon emission of chemical fertilizer contributes a higher percentage in three ways of carbon emissions, which showed a decrea- sing trend. The carbon absorption was far higher than the carbon emission in Dezhou City from 2001 to 2010. Farmland ecosystem of Dezhou City had an evident carbon sink function.