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文摘
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研究湖水溶解有机碳(Dissolved organic carbon,DOC)和颗粒有机碳(Particle organic carbon,POC)的空间变化特征有助于揭示湖泊有机碳的来源、迁移转化过程与控制因素。本文通过对贵州百花湖分层期水体DOC和POC浓度及其碳稳定同位素组成的对比研究,揭示了百花湖分层期水体有机碳浓度及稳定碳同位素的空间分布特征。研究结果表明,百花湖夏季分层期水体DOC和POC的浓度范围分别为1.97~3.26 mg/L(平均值2.58mg/L)和0.60~2.43mg/L(平均值1.14mg/L),且呈现出“上层高、下层低”的特征。水体DOC和POC浓度主要受藻类活动控制。水体δ~(13)C_(DOC)值随深度增加呈偏正趋势,这可能是由深层水体溶解有机质发生矿化作用和分解作用所致。水体δ~(13)C_(POC)值随水体深度增加呈偏负趋势,上下层水体藻类生产力差异和沉积物再悬浮作用可能是导致该现象的主要原因。受光降解作用影响,百花湖水体δ~(13)C_(DOC)较δ~(13)C_(POC)偏正。 |
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其他语种文摘
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Investigations on the dissolved organic carbon(DOC)and particulate organic carbon(POC)in lake water help to reveal the sources and fate of organic carbon.The concentrations and stable carbon isotopic compositions of dissolved organic carbon(DOC)and particulate organic carbon(POC)in Lake Baihua,Southwest China,were determined to investigate the spatial distribution of organic carbon in the stratified water column of Lake Baihua.The results indicated that DOC and POC concentrations are within the ranges of 1.97~3.26 mg/L (with a mean value of 2.58 mg/L) and 0.60~2.43 mg/L (with a mean value of 1.14mg/L),respectively.Both DOC and POC concentrations decrease with depth in the lake during stratification.Algal activity dominates the variations of DOC and POC in the water column.The considerable enrichment of δ~(13)C_(DOC) with depth in Lake Baihua during the stratified season is most likely due to mineralization and decomposition processes in the deeper water. The ~(13)C values of POC were ~(13)C-depleted progressively with depth during the stratified period because of differences in productivity and sedimentary resuspension between epilimnion and respiration.The consistent δ~(13)C-depletion of POC relative to DOC may have resulted from the fact that the DOC pool was more vulnerable to photodegradation. |
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来源
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地球与环境
,2014,42(5):597-603 【核心库】
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关键词
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百花湖分层期
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有机碳稳定碳同位素
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地址
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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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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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环境科学基础理论 |
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基金
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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:5267603
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