论文部分内容阅读
农田是重要的温室气体人为排放源,在全球气候变化研究中占有重要的地位.碳足迹是评估农作物生产生命周期温室气体排放的有力工具.因此,本研究以我国典型冬小麦生长区山西省晋中市为例,采用生命周期评价的方法估算该区单位质量小麦生产的碳足迹,并在此基础上用非线性规划的方法对冬小麦生产碳足迹进行优化,旨在寻求小麦增产减排的途径.结果表明,研究区在传统的耕作方式下,生产1 t小麦的碳足迹为1357.28 kg(以CO2当量计),其中,生长阶段的温室气体排放的碳足迹和尿素生产环节所占比例较大.通过优化尿素与有机肥的施用量,可将研究区生产1 t小麦的碳足迹降低到469.99 kg,同时使单位面积产量增加9.13%.本文结果与相关研究差异较大,可能与氮肥施用量及N2O排放系数的取值有关.本研究对于了解冬小麦生产的综合碳排放情况,探索农业增产减排途径等方面具有重要意义.
Farmland is an important man-made emission source of greenhouse gases and plays an important role in global climate change research.Carbon footprint is a powerful tool to evaluate greenhouse gas emissions during the life cycle of crop production.Therefore, in this study, a typical winter wheat growing area in Shanxi Province Jinzhong City as an example, the method of life cycle assessment was used to estimate the carbon footprint of unit mass wheat production in this area. Based on this, the non-linear programming method was used to optimize the carbon footprint of winter wheat production in order to seek ways to increase wheat yield and reduce emissions. The results showed that the carbon footprint of 1 t wheat was 1357.28 kg (in terms of CO2 equivalent) under the traditional tillage system in the study area. Among them, the carbon footprint and urea production of greenhouse gas emission during the growth stage accounted for a large proportion. By optimizing the application rates of urea and organic manure, the carbon footprint of 1 t wheat production in the study area can be reduced to 469.99 kg and the yield per unit area increased by 9.13% .This result is quite different from the related studies, which may be related to the nitrogen application rate and N2O emission coefficient of the value of this study to understand the integrated winter wheat production of carbon emissions and explore ways to reduce agricultural output and so on There’s important meaning.