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明确小麦-夏直播花生(W-P)种植体系的主要碳排放环节,可为采取有效措施实现该体系高产与低碳排放的协同效益提供参考。本文依据全生命周期方法,构建碳足迹模型,并核算了山东省W-P种植体系生命周期碳排放。结果表明:山东省W-P种植体系的净收益较小麦-玉米(W-M)种植体系高71.2%～88.3%;W-P种植体系的单位面积碳排放达6977.9～8018.5 kg·hm~(-2),较W-M种植体系高6.2%,但单位净产值的碳排放为0.23～0.28 kg CO_2eq·元~(-1),较W-M种植体系低37.4%～44.1%。综合2种种植体系的净收益和单位净产值碳排放发现,W-P种植体系可以实现高产出与低碳排放的协同效益,符合优化供给、提质增效、农民增收的农业供给侧结构性改革目标。
It is clear that the major carbon emission of wheat-summer direct seeding (W-P) planting system can provide reference for taking effective measures to realize the synergy of high yield and low carbon emission of this system. Based on the life-cycle approach, this paper constructs a carbon footprint model and accounts for the life-cycle carbon emissions of W-P cropping systems in Shandong Province. The results showed that the net income of WP planting system in Shandong Province was 71.2% -88.3% higher than that of the wheat-corn (WM) planting system, and that of WP planting system was 6977.9-8080.5 kg · hm -2. The planting system was 6.2% higher, but the net carbon emission per unit of production was 0.23-0.28 kg CO 2 eq · $ -1, which was 37.4% -44.1% lower than that of the WM planting system. Based on the net income and the net carbon emissions per unit of production of the two planting systems, it is found that the WP planting system can achieve synergies between high-yield and low-carbon emission, in line with the goal of structural reform on the supply side of agriculture in terms of optimizing supply, improving efficiency and increasing farmers’ incomes .