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

doi:10.3969/j.issn.1004-1524.20221398

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. 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

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

CLC Number:

S511

ZHU Yating, NI Yuanzhi, ZHANG Min, WANG Zhenqi, SHEN Genxiang, HUANG Na. Effects of straw returning amount on methane emission from paddy fields in Shanghai, China[J]. Acta Agriculturae Zhejiangensis, 2023, 35(10): 2436-2445.

Figures/Tables 5

Fig.1 Changes of CH4 emission flux at different growth stages of rice under different straw returning amounts

Fig.2 Daily variation of soil temperature at 5 cm depth (A) and CH4 emission flux (B) under different straw returning amounts

Fig.3 Correlationship between CH4 emission flux and soil temperature under treatments of CK (A), C1 (B), C2 (C), C3 (D)

Table 1 Accumulative CH4 emission at different growth stages of rice under different straw returning amounts kg·hm-2

处理 Treatment	分蘖期 Tillering stage	拔节抽穗期 Jointing and heading stage	灌浆成熟期 Grouting and maturity stage	全生育期 Whole growth stage
CK	6.48±0.02 c	2.05±0.01 c	3.08±0.04 c	11.61±0.07 c
C1	4.94±0.05 c	2.31±0.02 c	2.75±0.04 c	10.00±0.06 c
C2	26.47±0.02 b	6.85±0.04 b	19.94±0.05 b	53.26±0.06 b
C3	63.34±0.04 a	23.23±0.02 a	34.98±0.02 a	121.55±0.03 a

Fig.4 Rice yield and CH4 emission per unit rice yield under different straw returning amounts Bars (dots) marked without the same letters indicate significant difference at P<0.05.

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

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