稻麥輪作農(nóng)田CH<sub>4</sub>通量特征及對(duì)降雨的短期響應(yīng)

doi:10.12306/2023jms.0069

首頁(yè) > 過(guò)刊瀏覽>2025年第45卷第4期 >603-613. DOI:10.12306/2023jms.0069

稻麥輪作農(nóng)田CH4通量特征及對(duì)降雨的短期響應(yīng)
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                        10.12306/2023jms.0069
                    
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中圖分類(lèi)號(hào):X144
基金項(xiàng)目:江蘇省碳達(dá)峰碳中和科技創(chuàng)新專(zhuān)項(xiàng)(BE2023400);中國(guó)氣象局創(chuàng)新發(fā)展專(zhuān)項(xiàng)(CXFZ2023J073);江蘇省研究生實(shí)踐創(chuàng)新計(jì)劃(SJCX22_0374)

CH₄ flux characteristics and short-term response to rainfall in rice-wheat rotation farmland

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本文基于安徽省壽縣2019年11月—2020年10月渦度相關(guān)法觀測(cè)的稻麥輪作農(nóng)田CH₄通量數(shù)據(jù)，分析稻麥輪作農(nóng)田CH₄通量特征及對(duì)降雨的短期響應(yīng)過(guò)程。結(jié)果表明，壽縣稻麥輪作農(nóng)田為CH₄排放源，全年CH₄通量約為20.52 g·m^-2。其中，水稻生育期約為15.71 g·m^-2，占全年CH₄通量的77.6%，分蘗期(11.63 g·m^-2)最大；冬小麥生育期約為1.20 g·m^-2，乳熟期(0.66 g·m^-2)最大；休耕期約為3.60 g·m^-2。冬小麥CH₄通量日變化均表現(xiàn)為單峰型，峰值多出現(xiàn)于午后；稻季CH₄通量日變化表現(xiàn)為單峰型和雙峰型。降雨對(duì)CH₄通量峰值出現(xiàn)時(shí)間的影響具有時(shí)滯性，水稻生育期大雨的延遲效果最明顯。CH₄通量與降雨量顯著相關(guān)，水稻生育期小雨提高CH₄排放能力，不同等級(jí)雨量和雨強(qiáng)無(wú)顯著差異，冬小麥生育期中雨和大雨均提高CH₄排放能力，且隨著降雨強(qiáng)度的增強(qiáng)，農(nóng)田可能由匯向源轉(zhuǎn)變。

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Based on the CH₄ flux data of rice-wheat rotation farmland observed by eddy covariance method from November 2019 to October 2020 in Shouxian County， Anhui Province， this paper analyzed the CH₄ flux characteristics of rice-wheat rotation farmland and its short-term response process to rainfall. Results show that the rice-wheat rotation field in Shouxian was the source of CH₄， and the annual CH₄ flux was about 20.52 g·m^-2. The rice growth stage was about 15.71 g·m^-2， accounting for 77.6% of the annual CH₄ flux， and the maximum was at tillering stage (11.63 g·m^-2). The CH₄ flux of winter wheat growth period was about 1.20 g·m^-2， and of which the jointing period (0.66 g·m^-2) was the largest. The fallow period was about 3.60 g·m^-2. The diurnal variation of CH₄ flux of winter wheat showed a single-peak type， and the peak appeared mostly in the afternoon， while the diurnal variation of CH₄ flux of the rice showed both double-peak and single-peak types. The effect of rainfall on the peak time of CH₄ flux had a time lag， and the delayed effect of heavy rain in rice growth stage was the most obvious. CH₄ flux was significantly correlated with rainfall. Light rain during the rice growth period increased the CH₄ emission capacity， but there were no significant differences in different levels of rainfall and rainfall intensity， respectively. However， moderate rain and heavy rain during winter wheat growth period both enhanced the CH₄ emission， and the farmland was prone from a CH₄ sink to a CH₄ source with the increase of rainfall intensity.

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方硯秋,張方敏,虞曉蘭,盧燕宇,倪婷,張凱迪.稻麥輪作農(nóng)田CH₄通量特征及對(duì)降雨的短期響應(yīng).氣象科學(xué),2025,45(4):603-613 FANG Yanqiu, ZHANG Fangmin, YU Xiaolan, LU Yanyu, NI Ting, ZHANG Kaidi. CH₄ flux characteristics and short-term response to rainfall in rice-wheat rotation farmland. Journal of the Meteorological Sciences,2025,45(4):603-613

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收稿日期:2023-04-27
最后修改日期:2023-10-06
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在線發(fā)布日期: 2025-11-29
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