不同秸秆还田量对上海地区稻田甲烷排放的影响

doi:10.3969/j.issn.1004-1524.20221398

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

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.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. 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/Abstract

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

中图分类号:

S511

朱雅婷, 倪远之, 张敏, 王振旗, 沈根祥, 黄娜. 不同秸秆还田量对上海地区稻田甲烷排放的影响[J]. 浙江农业学报, 2023, 35(10): 2436-2445.

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.

图/表 5

图1 不同秸秆还田量下水稻不同生长期的CH4排放通量变化

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

图2 不同秸秆还田量下5 cm深度土壤温度(A)和CH4排放通量(B)的日变化

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

图3 CK(A)、C1(B)、C2(C)、C3(D)处理下CH4排放通量与土壤温度的相关性

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

表1 不同秸秆还田量下水稻各生长期的CH4累积排放量

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

图4 不同秸秆还田量下的水稻产量与单位水稻产量CH4排放量柱(点)上无相同字母的表示差异显著(P<0.05)。

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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不同秸秆还田量对上海地区稻田甲烷排放的影响

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

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