%0 Journal Article
%A ZHANG Cheng
%A LONG Li
%A Lü Xin-biao
%A LI Ying-chen
%A PENG Feng
%T Diel Greenhouse Emissions from an Eutrophic Pond in Summer
%D 2016
%R 10.11988/ckyyb.20150289
%J Journal of Yangtze River Scientific Research Institute
%P 28-33
%V 33
%N 8
%X Methane (CH<sub>4</sub>) and Carbon dioxide (CO<sub>2</sub>) 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 CH<sub>4</sub> and CO<sub>2 </sub>were 595.2 mg/(m<sup>2</sup>·d) and 1450.8 mg/(m<sup>2</sup>·d)  respectively. Bubble emissions of CH<sub>4</sub> and CO<sub>2</sub> accounted for 99.7% of the total CH<sub>4 </sub>emission and only 3.0% of the total CO<sub>2</sub> from the pond. Bubble emissions are highly time-variable in the observation period, with the biggest CH<sub>4 </sub>bubbling rate of 424.28 mg/(m<sup>2</sup>·h), accounting for 35.75% of the two days’ total bubbling CH<sub>4</sub> emissions, but ebullition CH<sub>4</sub> flux was mainly located at &lt;20 mg/(m<sup>2</sup>·h). The maximums of the diel diffusion CH<sub>4</sub> and CO<sub>2</sub> flux were 6.0 and 6.5 times of the responding minimums respectively.
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20150289