作物杂志,2023, 第2期: 229237 doi: 10.16035/j.issn.1001-7283.2023.02.033
Chen Zhongdu(), Xu Chunchun, Ji Long, Fang Fuping()
摘要:
量化分析作物生产碳、氮足迹可以有效帮助减少农业温室气体和活性氮排放。基于足迹理论和方法,采用问卷调查方式定量研究长江流域水稻生产碳足迹和氮足迹大小及组成。研究表明,水稻单位产量碳足迹和氮足迹分别介于0.50~0.90kgCO2-eq/kg和5.20~13.17gN-eq/kg,其中CH4和NH3排放为主要贡献因子。种植规模与碳足迹和氮足迹呈现显著负相关关系,与一般农户(低于0.7hm2)水稻种植相比,种粮大户(高于3.3hm2)碳足迹和氮足迹分别降低了33.8%和44.1%。在调研的稻田中发现,53.1%的地块肥料投入过量,54.9%的地块灌溉投入过量,且产量较低,存在着较大的节能减排潜力。提高农户的受教育水平和低碳绿色农业认知能够显著降低水稻生产碳、氮足迹。因此,发展双季稻节肥节水技术,提高农业机械运行效率,构建规模化农作种植模式,同时提升农户知识文化水平和加强低碳绿色农业知识的普及力度以及不同类型适应性行为的指导,健全低碳绿色农业技术创新与推广机制,有利于缓解中国长江流域双季稻种植区的气候变化和富营养化污染。
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