水资源与环境

某富营养化池塘夏季温室气体通量的昼夜变化

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  • 1.中国地质大学(武汉) 资源学院, 武汉 430074;
    2.三峡大学 a.电气与新能源学院;b.水利与环境学院, 湖北 宜昌 443002
张成(1974- ),男,湖北松滋人,讲师,博士研究生,主要从事环境地质相关研究,(电话)13972603074(电子信箱)390414859@qq.com。

收稿日期: 2015-04-10

  修回日期: 2015-05-07

  网络出版日期: 2016-07-25

Diel Greenhouse Emissions from an Eutrophic Pond in Summer

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  • 1.College of Earth Resource, China University of Geosciences, Wuhan 430074, China;
    2.College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002,China;
    3.College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002,China

Received date: 2015-04-10

  Revised date: 2015-05-07

  Online published: 2016-07-25

摘要

为揭示富营养化浅水池塘昼夜性的温室气体通量特征,利用DLT-100温室气体分析仪高采样频率的优势,通过48 h的在线观测,获得了宜昌野猪林池塘夏季CH4和CO2扩散和冒泡释放的昼夜性通量数据。观测点F点水气界面总CH4和CO2通量分别约为595.2,1 450.8 mg/(m2·d),CH4和CO2气泡排放量分别占到总排放量的99.7%和3.0%。观测期内冒泡存在高度时间变异性,最大的一次CH4冒泡释放速率为424.28 mg/(m2·h),占2 d内总气泡释放量的35.75%,而大多数时段的CH4冒泡速率低于20.0 mg/(m2·h)。监测期内CH4和CO2扩散通量的最高值分别为各自最低值的6.0和6.5倍。监测表明,富营养化浅水池塘夏季CH4通量非常高,且主要以冒泡方式释放;而CO2通量明显响应于浮游植物光合作用和呼吸作用交替的新陈代谢作用,存在昼夜性的变化规律。

本文引用格式

张成,龙 丽,吕新彪,李迎晨,彭 峰 . 某富营养化池塘夏季温室气体通量的昼夜变化[J]. 长江科学院院报, 2016 , 33(8) : 28 -33 . DOI: 10.11988/ckyyb.20150289

Abstract

Methane (CH4) and Carbon dioxide (CO2) emission pathways in summer were quantified during a 48 hours online survey of a subtropical shallow pond in Yichang, China. We separated the diel bubble and diffusion gas fluxes measured by the DLT-100 Analyzer (Los Gatos Research, USA) thanks to its high sampling frequency. The total emission fluxes of CH4 and CO2 were 595.2 mg/(m2·d) and 1450.8 mg/(m2·d) respectively. Bubble emissions of CH4 and CO2 accounted for 99.7% of the total CH4 emission and only 3.0% of the total CO2 from the pond. Bubble emissions are highly time-variable in the observation period, with the biggest CH4 bubbling rate of 424.28 mg/(m2·h), accounting for 35.75% of the two days’ total bubbling CH4 emissions, but ebullition CH4 flux was mainly located at <20 mg/(m2·h). The maximums of the diel diffusion CH4 and CO2 flux were 6.0 and 6.5 times of the responding minimums respectively.
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