土壤与作物2026，Vol.15Issue(2)：145-154,10.DOI:10.11689/sc.2025110501
我国南方稻区双季稻生产氮足迹分析
Evaluation of nitrogen footprint in double-rice production systems in southern China
摘要
Abstract
The food system is the largest contributor to anthropogenic reactive nitrogen emissions,with excessive emissions posing serious threats to the environment and human health.The rice-producing region of southern China,characterized by intensive nitro-gen fertilizer application,has become one of the critical zones for reactive nitrogen emissions.Taking the double-rice cropping areas in nine southern provinces of China as the research object,this study systematically analyzes the spatial-temporal distribution and composition of nitrogen footprint of double-rice by combining the rice yield and farm input in China,and applying the life cycle as-sessment(LCA)method and nitrogen footprint model.The results show that the nitrogen footprint per unit yield of double-rice in southern China is 7.18-10.92 kg(Nr-eq)·kg-1,with a declining trend over time and an annual reduction rate between 0.6%and 2.5%.The spatial distribution exhibits marked regional disparities,which are progressively widening.The nitrogen footprint per unit yield in southern China(Guangdong Province,Guangxi Zhuang Autonomous Region)is significantly higher than that in central China(Hubei Province,Hunan Province).In terms of emission composition,agricultural machinery operation and fertilizer application contribute the most to the potential reactive nitrogen emissions,accounting for 43%and 36%of the potential nitrogen footprint of double-rice,respectively.Among reactive nitrogen forms,NH3 volatilization represents the highest proportion(94.9%),which may be attributed to the warm and humid climate in southern China and the common practice of surface urea application.The contribu-tion rate of reactive nitrogen emissions from nitrogen fertilizers is exhibiting a clear downward trend year by year.Conversely,the percentage attributable to pesticides and diesel is continuously increasing.Promoting mechanized rice production and optimizing nitrogen fertilizer management are important measures for the green and healthy development of double-rice in China.关键词
双季稻/氮足迹/活性氮排放/生命周期评价Key words
double rice/nitrogen footprint/reactive nitrogen emissions/life cycle assessment分类
农业科技引用本文复制引用
陈中督,徐春春,纪龙,方福平..我国南方稻区双季稻生产氮足迹分析[J].土壤与作物,2026,15(2):145-154,10.基金项目
杭州市自然科学基金一般项目(2024SZRYBC030001) （2024SZRYBC030001）
新疆自治区青年科学基金(2022D01B223) （2022D01B223）
浙江省自然科学基金重点项目(LZ22G030007) （LZ22G030007）
农业农村长期因子综合观测工作资助. （）
