武安市农田生态系统碳源与碳汇研究

Carbon Source and Sink of Farmland Ecosystem in Wu'an

对武安市农田生态系统碳吸收量和排放量进行估算,并对其主要影响因素进行分析,以寻求减少农田生态系统碳排放的有效途径,进而促进农业的可持续发展。结果表明,武安市农田生态系统碳排放量整体呈相对稳定状态,其中化肥生产使用是主要的碳排放源;农田生态系统碳吸收量总体呈先降低后升高趋势,年际间波动明显,主要原因是农业投入的变化与种植结构的调整。相关性分析表明,碳吸收量与农作物产量、主要农作物类型、有效灌溉面积、农业机械的使用均存在正相关关系;碳排放量与化肥的生产使用、农业机械使用、有效灌溉面积以及农作物播种面积均呈正相关关系。基于以上分析,提出了调整农作物种植结构,改善化肥条件,调整耕作模式和灌溉制度以及秸秆等废弃物处置方式的建议,以达到促进温室气体减排和低碳农业发展的目的。

In order to explore the effective ways to decrease carbon emissions of farmland ecosystem,and promote the sustainable development of agriculture,this paper calculated the amount of carbon absorption and carbon emission respectively,and the spatial-temporal variations and impact factors of carbon absorp-tion and emission were analyzed. The results showed that the total amount of carbon emission appeared a relatively stable state,and the fertilizer production and use was the main source;the total amount of carbon absorption decreased first and then increased in the farmland ecosystem,the main reasons were the adjust-ments of farm inputs and agricultural structure. The correlation analysis results showed that carbon absorp-tion amount was significantly positively correlated with the crop yield,main crop types,effective irrigation area and use of agricultural machinery;positive correlations were observed between carbon emission amount and use of fertilizer,the use of agricultural machinery,effective irrigation area and crop planting area. Based on the above analysis,some policy suggestions were put forward to decrease the greenhouse gas emission and promote the low-carbon agriculture development, such as adjusting the crop planting structure,improving the conditions of fertilizer,adjusting the cultivation mode,the system of irrigation and straw waste disposal ways.