Seasonal and diurnal dynamics of physicochemical parameters and gas production in vertical water column of a eutrophic pond
Seasonal and diurnal dynamics of physicochemical parameters and gas production in vertical water column of a eutrophic pond
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富营养化池塘垂直水柱理化参数和产气量的季节和日动态
DOI：
10.1016/j.ecoleng.2015.12.007
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发表时间：
2016-02
影响因子：
3.8
通讯作者：
Yan Shaohua
中科院分区：
文献类型：
--
作者：
Gao Yan;Zhang Zhenhua;Liu Xinhong;Yi Neng;Zhang Li;Song Wei;Wang Yan;Mazumder Asit;Yan Shaohua
小而浅的水体通常表现出较高的生物地球化学活动率，但尚未受到太多关注。在这里，我们检验了这样的假设：在富营养化池塘中，物理化学特征存在强烈的昼夜分层，这将导致生物过程沿水柱垂直剖面产生的气体不均匀分布。因此，我们重点量化了垂直剖面中营养物质（NO 3−、NH 4+、总溶解氮 TDN、PO 4 3−、总溶解磷 TDP）、理化环境因素（DO、pH、光强度、叶绿素-a）和气体排放（N 2、N 2 O、O 2、CH 4）的季节性和昼夜动态。 位于中国亚热带气候区的超富营养化池塘。在夏季和秋季，沿水体垂直剖面观察到几个参数在厘米分辨率下存在强烈且持续的分层。有趣的是，地表水和沉积物-水界面产生的气体比水柱中层多得多。从地表水中收集的气体数量和成分受O 2 产生的影响很大，O 2 产生遵循日照强度的昼夜循环。其他生物过程，例如硝化和/或反硝化，也可能导致非均相气体产生，因为在表层和沉积物-水界面检测到高N 2 和N 2 O通量。 CH 4 的产生主要来自沉积物-水界面，特别是在夏季，由于强烈的分层，底层的 DO 浓度非常低。我们的结果表明，除了出乎意料的长期和强烈的热力和物理化学分层之外，由于这些物理化学参数的强烈的昼夜分层，浅层富营养化池塘可能会经历显着的气体排放垂直异质性。
Small and shallow water bodies often exhibit high rates of biogeochemical activities, yet have not received much attention. Here we test the hypothesis that there is strong diurnal stratification of physicochemical characteristics in a hyper-eutrophic pond, which would lead to a heterogeneous distribution of gas production via biological processes along vertical profile of water column. Accordingly, we focused on quantifying the seasonal and diurnal dynamics of nutrients (NO 3−, N H 4+, total dissolved nitrogen TDN, PO 4 3−, total dissolved phosphorus TDP), physicochemical environment factors (DO, pH, light intensity, Chlorophyll-a) and gas emission (N 2, N 2 O, O 2, CH 4) in the vertical profile of an ultra-eutrophic pond located at the subtropical climate zone, China. The strong and persistent stratification of several parameters at the resolution of centimeters along vertical profile of water was observed in summer and autumn. Interestingly, the surface water and sediment–water interface produced much more gas than the middle layers of water column. The quantity and composition of gas collected from the surface water were greatly affected by O 2 production, which followed the diurnal cycle of sunlight intensity. Other biological processes, eg nitrification and/or denitrification, may also have contributed to the heterogeneous gas production as high N 2 and N 2 O fluxes were detected in the surface layer and sediment–water interface. CH 4 production was mainly from the sediment–water interface, especially in summer when the bottom layer developed very low DO concentrations due to strong stratification. Our results demonstrate that besides the unexpectedly long and strong thermal and physicochemical stratification, the shallow eutrophic pond can undergo significant vertical heterogeneity of gas emission due to the strong diurnal stratification of these physicochemical parameters.
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影响因子：
5.8
作者：
X. Biao;Zhuhong Ding;Xiaorong Wang
通讯作者：
X. Biao;Zhuhong Ding;Xiaorong Wang
影响因子：
9.8
作者：
C. Neal;M. Harrow;Richard J. Williams
通讯作者：
C. Neal;M. Harrow;Richard J. Williams
影响因子：
2.4
作者：
G. Weyhenmeyer
通讯作者：
G. Weyhenmeyer
影响因子：
11.4
作者：
S. Ferrón;D. T. Ho;Z. Johnson;M. Huntley
通讯作者：
S. Ferrón;D. T. Ho;Z. Johnson;M. Huntley
影响因子：
2.5
作者：
Jp Szyper;J. Ebeling
通讯作者：
Jp Szyper;J. Ebeling