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我校學者在研究中回答不同水稻生產系統如何實現固碳減排

核心提示: 近日,我校宏觀農業研究院、植物科學技術學院農業生態研究團隊同中國農業科學院農業環境與可持續發展研究所合作,回答了不同水稻生產系統如何實現固碳減排的問題。

不同稻作系統的單位經濟收益碳足跡 (kg CO2-eq yuan-1)

不同稻作系統的單位經濟收益碳足跡 (kg CO2-eq yuan-1)

南湖新聞網訊(通訊員 阿依吐拉•買買提祖農)近日,我校宏觀農業研究院、植物科學技術學院農業生態研究團隊與中國農業科學院農業環境與可持續發展研究所合作研究,回答了不同水稻生產系統如何實現固碳減排的問題。

該研究基於農業生態團隊在湖北省不同試驗站採用統一的靜態箱-氣相色譜法測定的稻閒、稻油輪作、稻麥輪作、雙季稻和稻蝦共作等水稻生產系統的CH4和N2O排放試驗數據,結合生物地球化學循環DNDC(DeNitrification DeComposition)模型進行模擬分析。在對每個系統進行模型校正、驗證後,將觀測結果統一尺度進行模擬比較,並分別採用基於過程的生命週期評估(PLCA)方法和成本效益分析方法對生產系統的碳足跡和經濟效益計算,系統評估不同水稻生產系統不同減排措施下的經濟產出和碳足跡。

研究結果表明,每種水稻生產系統需要配置不同的減排措施,才能夠實現高收入-低排放,並且相同的措施在不同模式中的減排角色不同。此外,經過對系統不同組分碳排放結果的分析,得到減少氮肥用量、減少機械投入成本分別是稻旱輪作系統、雙季稻系統最重要和有效的減排措施。該研究可為不同水稻生產系統增效低碳生產提供技術指導!

研究成果以“Comparing rice production systems in China: Economic output and carbon footprint”為題發表在Science of the Total Environment上,宏觀農業研究院凌霖博士後為第一作者,曹湊貴教授為通訊作者。上述研究獲得國家重點研發計劃項目和中央高校基本科研業務費專項資金等項目的共同資助。

論文通訊作者(曹湊貴)團隊經過10多年稻作系統固碳減排研究,提出了“增匯、降耗、減排、循環”的低碳稻作理論,出版了《低碳稻作理論與實踐》專著。近期還發表了題為“水稻生產碳中和現狀及低碳稻作技術策略”(//hnxbl.cnjournals.net/hznydxzr/article/pdf/20210302)的綜述論文。團隊相關研究可為助力實現國家“雙碳”目標提供重要支撐。

審核人:曹湊貴 遊良志

【寄件到內地】

In recent years, many rotational and integrated rice production systems coupled with several greenhouse gas (GHG) emissions mitigation practices have been developed and adopted for demand of low carbon production. However, there have been only few studies about comparisons on the balance between high production and mitigation of GHG emissions in different rice production systems. We therefore aimed to evaluate economic output and carbon footprint of different rice production systems, based on several long-term experiments conducted by our lab. CH4 andN2O emission were measured by the same static chamber/gas chromatogram measurement procedure in different rice production systems, including rice-fallow, rice-rapeseed, rice-wheat, double rice, and integrated rice-crayfish production system. Then, we applied the DeNitrification DeComposition model to simulate CH4 and N2O emission over different years under the same condition for comparison. Carbon footprint was calculated following the process-based life cycle assessment (PLCA) methodology. The economic benefit of rice production systems was assessed by cost-benefit analysis. According to the analysis, the double-rice production system exhibited the highest intensity of carbon footprint (ICF = 4.14 kg CO2-eq yuan−1), rain-fed treatment in the rice-rapeseed system had the lowest (ICF = 0.68 kg CO2-eq yuan−1). The intensity of carbon footprint in different treatments in the integrated rice-crayfish production system was around 0.8 kg CO2-eq yuan−1. Overall, the results of this case study suggest: (1) the proposed practices in different rice production systems are no straw returning (rice-fallow), no-tillage without straw returning (rice-wheat), rain-fed farming (rice-rapeseed), no insect and no inoculation (double rice), and feeding with straw returning (rice-crayfish); (2) rotational and integrated systems can achieve high net output with low carbon emission; (3) reducing the amount of nitrogenous fertilizer application is the most important and effective GHG mitigation practice for rotational systems.

論文鏈接//doi.org/10.1016/j.scitotenv.2021.147890

責任編輯:徐行 歐陽美玲