某富营养化池塘夏季温室气体通量的昼夜变化

张成,龙 丽,吕新彪,李迎晨,彭 峰

raybet体育在线 院报 ›› 2016, Vol. 33 ›› Issue (8) : 28-33.

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raybet体育在线 院报 ›› 2016, Vol. 33 ›› Issue (8) : 28-33. DOI: 10.11988/ckyyb.20150289
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

  • 张成1,2a,龙 丽2b,吕新彪1,李迎晨2b,彭 峰2b
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Diel Greenhouse Emissions from an Eutrophic Pond in Summer

  • ZHANG Cheng1,2, LONG Li3, Lü Xin-biao1, LI Ying-chen3, PENG Feng3
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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。

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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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]. raybet体育在线 院报. 2016, 33(8): 28-33 https://doi.org/10.11988/ckyyb.20150289
ZHANG Cheng, LONG Li, Lü Xin-biao, LI Ying-chen, PENG Feng. Diel Greenhouse Emissions from an Eutrophic Pond in Summer[J]. Journal of Changjiang River Scientific Research Institute. 2016, 33(8): 28-33 https://doi.org/10.11988/ckyyb.20150289
中图分类号: X14   

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