河流-水库体系水体表层pCO_2时空变化特征及其扩散通量——以六冲河、洪家渡水库、红枫湖为例
Spatiotemporal Characteristics and Diffusion Flux of Partial Pressure of Dissolved Carbon Dioxide(pCO_2) in the River-Reservoir System as Exemplified by the Liuchonghe River,Hongjiadu Reservoir and Hongfenghu Lake
查看参考文献20篇
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文摘
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为了了解筑坝后河流-水库体系CO_2的释放特征,本研究于2011年5月至2012年5月调查了乌江流域的六冲河以及处于不同营养水平的洪家渡水库和红枫湖表层水体的基本物理、化学和生物参数及溶解无机碳碳同位素组成(δ~(13) C_(DIC)),分析计算表层水体pCO_2及水气界面的CO_2交换通量(CO_2flux)。六冲河、洪家渡水库和红枫湖表层水体的pCO_2年平均值分别为684±195μatm、884±484μatm和592±596μatm,均大于大气中的pCO_2,表现为大气CO_2的源。红枫湖表层水体中的pCO_2受到藻类等水生生物的作用最强,洪家渡水库次之,六冲河表层水体最弱,导致它们表层水体中的pCO_2具有明显不同的时间分布特征,相应的CO_2flux的时间分布也明显不同。红枫湖的初级生产力水平最高,在2011年5月至2011年9月时表现为大气CO_2的汇,水气界面的交换通量平均为-5.70mmol.m~(-2).d~(-1)。δ~(13) C_(DIC)和pCO_2同步变化揭示了水体表层pCO_2时空变化受藻类等生物活动的影响。本研究表明,高频率的监测对于准确评估河流-水库体系CO_2flux非常必要。 |
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其他语种文摘
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In order to understand the diffusion characteristics of CO_2in the river-reservoir system after damming,the Liuchonghe River,Hongjiadu Reservoir and Hongfenghu Lake which are different in trophic levels were investigated during May,2011 to May,2012.The basic physical,chemical and biological factors and the isotopic composition of dissolved carbon dioxide (δ~(13) C_(DIC))in these surface waters were measured,too.pCO_2and the exchange flux of CO_2(CO_2flux)through the water-air interface were calculated.The average pCO_2in the Liuchonghe River,Hongjiadu Reservoir and Hongfenghu Lake were 684± 195μatm,884±484μatm and 592±596μatm,respectively,which were the carbon source relative to atmospheric pCO_2.The pCO_2was affected differently by algal activity in the Liuchonghe River,Hongjiadu Reservoir and Hongfenghu Lake.The pCO_2 had different biweekly changes in the Liuchonghe River,Hongjiadu Reservoir and Hongfenghu Lake,and so did the CO_2flux. The Hongfenghu Lake,of the highest primary productivity,behaved as a carbon sink during May,2011to September,2011, and the average CO_2flux was-5.70mmol·m~(-2)·d~(-1).δ~(13) C_(DIC)and pCO_2changed synchronously,indicating that the biogeochemical process controlled the spatiotemporal change of pCO_2in surface water.The necessity of high monitoring for estimating the CO_2flux in the river-reservoir system was accurately explained. |
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来源
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地球与环境
,2013,41(2):97-103 【核心库】
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关键词
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CO_2扩散通量
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初级生产力
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筑坝
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乌江
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地址
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1.
中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550002
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上海大学环境与化学工程学院, 上海, 200444
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1672-9250 |
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学科
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地质学 |
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基金
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国家重大科学研究计划
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国家自然科学基金
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文献收藏号
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CSCD:4800270
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