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| 长江中下游平原两种典型稻田甲烷通量变化特征与影响因素 |
| Variation characteristics and influencing factors of methane fluxes from two typical rice paddies in the middle and lower Yangtze River Plain |
| 投稿时间：2025-12-04 |
| DOI：10.13254/j.jare.2025.1236 |
| 中文关键词: 双季晚稻，稻麦轮作，甲烷通量，涡度相关，环境因素 |
| 英文关键词: double cropping late rice, wheat-rice rotation, CH4 flux, eddy covariance, environmental factor |
| 基金项目:国家自然科学基金项目（52509072）；中央级公益性科研院所基本科研业务费专项（Y924001）；江苏省基础研究计划项目（BK20250909）；江苏省研究生科研与实践创新计划项目（KYCX25_3994） |
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| 中文摘要: |
| 为探明长江中下游不同类型稻田甲烷（CH4）通量变化特征与影响因素，本研究基于涡度相关法对两种典型稻田，即稻麦轮作单季稻（江都站）和双季晚稻（南昌站）CH4通量开展了同步观测试验，对比分析了不同类型稻田CH4通量变化特征与环境影响因素。结果表明，稻麦轮作单季稻和双季晚稻CH4日变化在营养生长期和生殖生长期均为显著单峰型，稻麦轮作单季稻CH4峰值出现在14：00—15：00，而双季晚稻CH4峰值出现略晚，出现在15：00—16：00；两种稻田成熟期CH4通量均表现为无明显日内变化。稻麦轮作单季稻和双季晚稻CH4排放总量分别为34.4 g·m-2和52.5 g·m-2。基于皮尔逊相关性分析发现，半小时尺度上，温度、饱和水汽压差（VPD）是影响两种稻田CH4通量的主要影响因素，且对双季晚稻营养生长期CH4通量的影响显著高于稻麦轮作单季稻；日尺度上，温度、VPD、总初级生产力（GPP）和净辐射（Rn）等因素显著影响全生育期两站点CH4通量，但基于结构方程模型发现，空气温度（TA）是影响全生育期两站点稻田CH4通量的直接重要因素，VPD在一定程度上直接影响南昌站CH4通量。研究表明，CH4排放均集中在水稻的营养生长期和生殖生长期，成熟期排放维持在较低水平。TA、土壤有机质、水稻品种、前期水分管理可能是导致两站点排放差异的原因。 |
| 英文摘要: |
| To investigate the variation characteristics and influencing factors of methane（CH4）fluxes from different types of rice paddies in the middle and lower Yangtze River Plain, this study employed eddy covariance technique to conduct synchronous observations of CH 4 fluxes from two typical rice paddies：single-season rice under rice-wheat rotation（Jiangdu site）and double-season late rice（Nanchang site）. It compared and analyzed the characteristics of CH4 flux variations and their environmental drivers across different rice paddies. Results indicated that both the single-season rice under the rice-wheat rotation and double-season late rice exhibited significantly unimodal diurnal CH4 variations during both the vegetative and reproductive periods. The CH4 peak for single-season rice occurred between 14：00 and 15：00, while the peak for double-season late rice appeared slightly later, between 15：00 and 16：00. Both rice paddies showed no significant diurnal variation in CH4 flux during their ripening periods. The total CH4 emissions from single-season rice under rice-wheat rotation, and double-season late rice were 34.4 g·m-2 and 52.5 g·m-2, respectively. Based on Pearson correlation analysis, temperature and vapor pressure deficit（VPD）were identified as the primary drivers influencing CH4 fluxes in both rice paddies at the half-hour scale. However, environmental factors during the vegetative growth stage of double-cropped late rice exerted a significantly stronger influence on CH4 fluxes compared with single-season rice under rice-wheat rotation. On a daily scale, factors such as temperature, VPD, gross primary production（GPP）, and net radiation（Rn）significantly influenced CH4 fluxes at both sites throughout the whole growing season. However, structural equation modeling revealed that air temperature（TA）was the direct key factor affecting CH4 fluxes in paddy fields at both sites throughout the whole growing season, while VPD directly influences CH4 fluxes at the Nanchang site to a certain extent. Research indicates that CH4 emissions are concentrated during the vegetative and reproductive growth periods of rice, with emissions remaining at a low level during the ripening period. TA, soil organic matter, rice variety, and prior water management practice may contribute to the differences in emissions between the two sites. |
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