Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (10): 2436-2445.DOI: 10.3969/j.issn.1004-1524.20221398

• Environmental Science • Previous Articles     Next Articles

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

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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