箱体特征对箱式法观测水-气界面CO2和CH4通量的影响

doi:10.13287/j.1001-9332.202206.019

摘要/Abstract

摘要： 箱式法是广泛运用于内陆水体CO₂和CH₄通量监测的重要方法,但各研究中使用的箱体特征存在差异,箱体设计缺少统一标准,从而会影响观测结果。为明确箱体透光性、箱体内外气压差以及箱体内气体混合状态对水-气界面CO₂和CH₄通量观测的影响,本研究基于多通道闭路式动态箱观测系统,分别对比明箱和暗箱、箱体是否配备气压平衡阀及风扇对养殖塘水-气界面CO₂和CH₄通量观测的影响。结果表明: 夏季白天观测期间,与可观测CO₂实际通量的明箱相比,当CO₂呈现排放状态时,暗箱高估了90%的CO₂通量;当CO₂呈现吸收状态时,暗箱低估了50%的CO₂通量。暗箱测得的CH₄扩散通量比明箱低40%。箱体内气压是否与外界气压保持平衡对CO₂和CH₄通量影响均不显著。无风扇的箱体观测的CO₂通量代表性较差,在本研究中较有风扇的箱体高20%。无风扇的箱体难以区分不同途径排放的CH₄通量。在运用箱式法观测水-气界面CO₂、CH₄通量时,应使用透明箱体,并在其中安装风扇辅助气体混合。

关键词: 箱式法, 箱体特征, 水-气界面, CO₂通量, CH₄通量

Abstract: The chamber method is widely used to measure CO₂ and CH₄ flux in inland water. However, the designs of chamber used in various studies are different and lack unified standards, which would affect the observation results. To clarify the impacts of chamber characteristics, including light transmittance, air pressure difference inside and outside the chamber, and gas mixing degree in the chamber, on CO₂ and CH₄ flux measurements at the water-air interface, we compared the effects of transparent/opaque chamber, the chamber with/without air pressure equalizing device and fan on CO₂ and CH₄ flux measurements in the aquaculture pond, based on the multi-channel closed dynamic chamber system. The results showed that, during the daytime in summer, compared with the transparent chamber which could measure the actual CO₂ flux, when CO₂ was emitted from the pond, the opaque chamber overestimated the CO₂ flux by 90%; when CO₂ was absorbed by the pond, the opaque chamber underestimated the CO₂ flux by 50%. The CH₄ diffusion flux measured by the opaque chamber was 40% lower than that measured by the transparent chamber. There was no significant difference between CO₂ and CH₄ flux measured by the chamber with and without air pressure equalizing device. CO₂ flux observed by the chamber without fan had poor representativeness, being 20% higher than that observed by the chamber with fan. Moreover, CH₄ flux emitted through different pathways could not be distinguished using the chamber without fan. Therefore, when the chamber method was used to observe the CO₂ and CH₄ flux at the water-air interface, the chamber shall be transparent and be installed with fan.

Key words: chamber method, chamber characteristics, water-air interface, CO₂ flux, CH₄ flux

贾磊, 张弥, 蒲旖旎, 赵佳玉, 谢燕红, 肖薇, 刘寿东, 石婕. 箱体特征对箱式法观测水-气界面CO₂和CH₄通量的影响[J]. 应用生态学报, 2022, 33(6): 1563-1571.

JIA Lei, ZHANG Mi, PU Yi-ni, ZHAO Jia-yu, XIE Yan-hong, XIAO Wei, LIU Shou-dong, SHI Jie. Effects of chamber characteristics on CO₂ and CH₄ flux at the water-air interface measured by the chamber method[J]. Chinese Journal of Applied Ecology, 2022, 33(6): 1563-1571.

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箱体特征对箱式法观测水-气界面CO₂和CH₄通量的影响

Effects of chamber characteristics on CO₂ and CH₄ flux at the water-air interface measured by the chamber method

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