浙江农业学报 ›› 2023, Vol. 35 ›› Issue (10): 2436-2445.DOI: 10.3969/j.issn.1004-1524.20221398

• 环境科学 • 上一篇    下一篇

不同秸秆还田量对上海地区稻田甲烷排放的影响

朱雅婷1,2(), 倪远之2, 张敏2, 王振旗2, 沈根祥1,2,*(), 黄娜2,3   

  1. 1.华东理工大学 资源与环境工程学院,上海 200237
    2.上海市环境科学研究院 国家环境保护新型污染物环境健康影响评价重点实验室,国家环境保护城市大气复合污染成因与防治重点实验室,上海 200233
    3.东华大学 环境科学与工程学院,上海 200051
  • 收稿日期:2022-09-26 出版日期:2023-10-25 发布日期:2023-10-31
  • 作者简介:朱雅婷(1998—),女,福建南平人,硕士研究生,研究方向为农业大气污染控制。E-mail:zhuyating1128@163.com
  • 通讯作者: *沈根祥,E-mail:shengx@saes.sh.cn
  • 基金资助:
    上海市生态环境局科研项目[沪环科(2021-09),沪环科(2022-03)];上海市环境科学研究院科技创新基金(CX2020090203);上海市环境科学研究院科技创新基金(CX2021090317)

Effects of straw returning amount on methane emission from paddy fields in Shanghai, China

ZHU Yating1,2(), NI Yuanzhi2, ZHANG Min2, WANG Zhenqi2, SHEN Genxiang1,2,*(), HUANG Na2,3   

  1. 1. School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
    2. State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminants, State Environmental Protection Key Laboratory of the Cause and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, Shanghai 200233, China
    3. College of Environmental Science and Engineering, Donghua University, Shanghai 200051, China
  • Received:2022-09-26 Online:2023-10-25 Published:2023-10-31

摘要:

为明确不同秸秆还田量对上海地区稻田甲烷(CH4)排放的影响,以上海市青浦区稻田为研究对象,利用PICARRO G2508温室气体在线监测系统探索不同秸秆还田量下稻田CH4的排放特征。结果表明,稻田CH4排放通量与5 cm深度土壤温度呈显著(P<0.05)正相关,且两者的相关性随着秸秆还田量的增加而增强。稻田CH4排放量随着秸秆还田量的增加而增加,在秸秆不还田、半量(2.5 t·hm-2)还田和全量(5.0 t·hm-2)还田3种情景下,稻田CH4累积排放量分别为(10.00±0.06)、(53.26±0.06)、(121.55±0.03) kg·hm-2,且其排放集中在水稻分蘖期,贡献率达49.40%~52.11%。在不显著影响水稻产量的前提下,秸秆半量还田的单位水稻产量CH4排放量较全量还田降低56.17%,是本试验条件下推荐的适宜秸秆还田量。

关键词: 甲烷排放, 秸秆还田, 水稻产量, 甲烷减排

Abstract:

In order to clarify the effects of straw returning amount on methane (CH4) emission from paddy field in Shanghai, China, a field experiment was conducted in Qingpu District, and the characteristics of methane emission was determined via the PICARRO G2508 greenhouse gas monitoring system under different straw returning amounts. It was shown that there was a significant (P<0.05) positive correlation between CH4 emission flux and soil temperatures at 5 cm depth, and the correlation coefficient went higher with the increase of straw returning amount. The accumulative CH4 emission from paddy field increased with the increasing straw returning amount. With no straw returning, half-amout (2.5 t·hm-2) straw returning, full-amount (5.0 t·hm-2) straw returning to the field, the accumulative CH4 emission from paddy field was (10.00±0.06), (53.26±0.06), (121.55±0.03) kg·hm-2, respectively, and the CH4 emission mainly happened during rice tillering stage, of which the contribution rate was 49.40%-52.11%. Compared with the full-amout straw returning, half-amount straw returning to the filed decreased CH4 emission per unit yield by 56.17% withtout significant yield reduction, which was the recommend amount for straw returning to reduce CH4 emission from rice field under experiment conditions.

Key words: methane emission, straw returning to the field, rice yield, methane emission reduction

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