College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
International Rice Research Institute, Los Baños, Laguna 4031, Philippines.
Sci Total Environ. 2024 Jul 15;934:173281. doi: 10.1016/j.scitotenv.2024.173281. Epub 2024 May 15.
Rice production is a primary contributor to global greenhouse gas emissions, with unclear pathways towards carbon neutrality. Here, through a comprehensive assessment of direct greenhouse gas (GHG) emission using DNDC model and indirect GHG emission using emission factor methods, we estimated the annual crop yield, GHG emission amount and intensity, and economic benefits of different cropping patterns in the climate-sensitive regions of rice production in China. Through the expansion of single-rice and cropping pattern change from the wheat-rice to wheat-rice-rice in the climate-sensitive regions of single and triple-cropping cultivations, the total grain yield increased by 4.4 % and 4.5 % compared with the current national grain production, the GHG emission would increase by 2.4 % and 5.4 % of the current national GHG emissions from rice and wheat production, the net economic benefits could increase 0.9 % and decrease 2.0 % of the national output value of rice and wheat production. The study takes the entire-life cycle of crop growth as the principal line, and could provide a valuable reference for the regulation of the cropping pattern and the formulation of carbon reduction policies in the climate-sensitive region.
水稻生产是全球温室气体排放的主要贡献者，实现碳中和的途径尚不清楚。在这里，我们通过使用 DNDC 模型对直接温室气体（GHG）排放进行综合评估，并使用排放因子方法对间接 GHG 排放进行评估，评估了中国水稻生产敏感气候区不同种植模式的年度作物产量、GHG 排放量和强度以及经济效益。通过在单季和三季栽培的敏感气候区扩展单季稻和从麦稻两熟制到麦稻稻三熟制的种植模式变化，与当前全国粮食生产相比，总粮食产量将增加 4.4%和 4.5%，水稻和小麦生产的 GHG 排放量将增加 2.4%和 5.4%，水稻和小麦生产的净经济效益将分别增加 0.9%和减少 2.0%。本研究以作物生长的整个生命周期为主线，可为敏感气候区种植模式的调整和减碳政策的制定提供有价值的参考。
