51. Water regime-nitrogen fertilizer incorporation interaction: Field study on methane and nitrous oxide emissions from a rice agroecosystem in Harbin, China
- Author
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Jia Guo, Chunxu Leng, Yilei Yu, Zhang Xijuan, Zhifeng Song, Lijun Xu, Lai Yongcai, Tang Ao, Liu Youhong, Meng Ying, Yu Yang, Zhang Jun, Lianmin Wang, Yang Zhongliang, Dong Wenjun, and Wang Lizhi
- Subjects
Agroecosystem ,China ,Environmental Engineering ,Field experiment ,Nitrous Oxide ,chemistry.chemical_element ,Fresh Water ,010501 environmental sciences ,engineering.material ,01 natural sciences ,chemistry.chemical_compound ,Environmental Chemistry ,Fertilizers ,Nitrogen cycle ,Ecosystem ,0105 earth and related environmental sciences ,General Environmental Science ,Air Pollutants ,Agriculture ,Oryza ,04 agricultural and veterinary sciences ,General Medicine ,Nitrous oxide ,Nitrogen Cycle ,Nitrogen ,Agronomy ,chemistry ,Greenhouse gas ,040103 agronomy & agriculture ,engineering ,0401 agriculture, forestry, and fisheries ,Paddy field ,Environmental science ,Fertilizer - Abstract
Water regime and nitrogen (N) fertilizer are two important factors impacting greenhouse gases (GHG) emission from paddy field, whereas their effects have not been well studied in cold region. In this study, we conducted a two-year field experiment to study the impacts of water regime and N fertilizer on rice yields and GHG emissions in Harbin, China, a cold region located in high latitudes. Our results showed that intermittent irrigation significantly decreased methane (CH4) emission compared with continuous flooding, however, the decrement was far lower than the global average level. The N2O emissions were very small when flooded but peaked at the beginning of the disappearance of floodwater. The N fertilizer treatments increased CH4 emissions at low level (75kgN/ha). But both CH4 and N2O emissions were uninfluenced at the levels of 150kgN/ha and 225kgN/ha. Rice yields increased under intermittent irrigation and were highest at the level of 150kgN/ha. From our results, we recommended that the intermittent irrigation and 150kgN/ha as the ideal water regime-nitrogen fertilizer incorporation for this area to achieve low GHG emissions without impacting rice yields.
- Published
- 2016