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Chromophoric dissolved organic matter in the estuaries of populated and mountainous Taiwan

机译：台湾人口多山的山口的发色溶解性有机物

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摘要

Absorption and fluorescence of chromophoric dissolved organic matter (CDOM) in 16 Taiwan estuaries are reported for the first time, so as to examine the influence of catchment characteristics on the CDOM level and to study the estuarine behavior of CDOM. The absorption coefficient (a_(350)) in the freshwater end-member ranged from 0.15 to 12.5 m~(-1) among estuaries. The a_(350) and fluorescence intensities correlated positively with population density and the chlorophyll a concentration, likely due to the additions of CDOM from anthropogenic activities and autochthonous production. The freshwater a_(350) also correlated negatively with precipitation, headwater altitude and freshwater discharge. The a_(350) generally decreased linearly with increasing salinity in most estuaries. Humic-like fluorescent components had intensities strongly correlated with a_(350), while protein-like components received notable additions in five estuaries but were removed in another five estuaries. The absorption spectral slope (S_(279-295)) and slope ratio (S_R; 275-295 nm slope: 350-400 nm slope) generally increased with increasing salinity, likely reflecting a decrease in the average molecular weight The contribution of protein-like components to the total fluorescence changed greatly among different estuaries, which was in part associated with river population density and precipitation. The results showed that both the catchment characteristics and estuarine bio-geochemical processes contributed to the variations of CDOM level and composition in estuarine environments.
机译：首次报道了台湾16个河口的发色溶解性有机物（CDOM）的吸收和荧光，从而研究了流域特征对CDOM水平的影响并研究了CDOM的河口行为。在河口之间，淡水末端构件的吸收系数（a_（350））在0.15至12.5 m〜（-1）之间。 a_（350）和荧光强度与种群密度和叶绿素a浓度呈正相关，这可能是由于人为活动和自发产生增加了CDOM所致。淡水a_（350）也与降水，源水高度和淡水排放负相关。在大多数河口，a_（350）通常随着盐度的增加呈线性下降。腐殖质样荧光组分的强度与α_（350）密切相关，而蛋白质样组分在五个河口中明显增加，但在另外五个河口中被去除。吸收光谱的斜率（S_（279-295））和斜率比（S_R; 275-295 nm斜率：350-400 nm斜率）通常随着盐度的增加而增加，可能反映了平均分子量的降低。在不同的河口之间，总荧光的相似成分发生了很大变化，这部分与河流人口密度和降水有关。结果表明，流域特征和河口生物地球化学过程都对河口环境中CDOM水平和组成的变化做出了贡献。

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  • 来源
    《Marine Chemistry》 |2013年第20期|12-23|共12页
  • 作者

    Liyang Yang; Huasheng Hong; Chen-Tung Arthur Chen; Weidong Guo; Ting-Hsuan Huang;

  • 作者单位

    Institute of Marine Geology and Chemistry, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, Fujian, PR China;

    State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, Fujian, PR China;

    Institute of Marine Geology and Chemistry, National Sun Yat-sen University, Kaohsiung 804, Taiwan, ROC The Second Institute of Oceanology, State Oceanic Administration, Hangzhou, China Institute of Marine Geology and Resource, Zhejiang University, Hangzhou, PR China;

    State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, Fujian, PR China;

    Institute of Marine Geology and Chemistry, National Sun Yat-sen University, Kaohsiung, Taiwan, ROC;

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  • 正文语种 eng
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  • 关键词

    Mountainous rivers; Estuaries; Dissolved organic matter; CDOM; PARAFAC; Taiwan;

    机译：山区河流;河口;溶解的有机物;CDOM;PARAFAC;台湾;

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