冯龙庆, 刘明亮, 张运林, 殷燕, 时志强, 刘笑菡. 夏季丰水期河流输入对太湖有色可溶性有机物的贡献[J]. 水科学进展, 2011, 22(1): 104-111.
引用本文: 冯龙庆, 刘明亮, 张运林, 殷燕, 时志强, 刘笑菡. 夏季丰水期河流输入对太湖有色可溶性有机物的贡献[J]. 水科学进展, 2011, 22(1): 104-111.
FENG Long-qing, LIU Ming-liang, ZHANG Yun-lin, YIN Yan, SHI Zhi-qiang, LIU Xiao-han. Upstream contributions to the chromophoric dissolved organic matter in the Taihu Lake during summer rainy seasons[J]. Advances in Water Science, 2011, 22(1): 104-111.
Citation: FENG Long-qing, LIU Ming-liang, ZHANG Yun-lin, YIN Yan, SHI Zhi-qiang, LIU Xiao-han. Upstream contributions to the chromophoric dissolved organic matter in the Taihu Lake during summer rainy seasons[J]. Advances in Water Science, 2011, 22(1): 104-111.

夏季丰水期河流输入对太湖有色可溶性有机物的贡献

Upstream contributions to the chromophoric dissolved organic matter in the Taihu Lake during summer rainy seasons

  • 摘要: 结合2008年夏季丰水期对太湖上游直湖港、大浦河、长兜港3条河流有色可溶性有机物(CDOM)吸收和三维荧光的测定分析,探讨了夏季丰水期时河流输入对太湖中CDOM的贡献。3条河流中直湖港CDOM浓度最高,大浦河次之,长兜港最低,反映了太湖北部外源河流污染物输入大于西南部。3条河流内CDOM吸收a(355)的均值为(4.76±0.79)m-1,明显大于湖泊水域的(3.62±0.84)m-1。从河流往河口再往湖泊水域CDOM吸收大致呈现逐渐下降的趋势,反映了丰水期外源河流输入CDOM对湖泊内CDOM的重要贡献。利用平行因子分析法对CDOM三维荧光图谱解析获得4种荧光组分,其中组分1和组分2为类蛋白荧光、组分3和组分4组为类腐殖质荧光,从河口至湖泊水域类腐殖质荧光强度逐渐减小,类蛋白荧光则明显增大,暗示河流主要带来类腐殖质荧光有机物。

     

    Abstract: The spectral absorption and the three-dimensional fluorescence of chromophoric dissolved organic matter (CDOM)in three rivers (Zhihugang,Dapukou,and Changdougang)located upstream of the Taihu Lake are deter-mined.Such an upstream contribution to CDOM in the lake during the summer rainy season of 2008 is analyzed.It is found that the Zhihugang River has the highest CDOM absorption value,and followed by Dapukou.The lowest CDOM value is found in the Changdougang River.This result indicates that the allochthonous pollutant of the north river up-stream of the Taihu Lake contributes the most CDOM in the lake.Our results also show that the mean value of (4.76±0.79)m-1 is found for the absorption coefficient of CDOM at 355 nm in the three rivers,which is significantly lar-ger than that of (3.62±0.84)m-1 in the Taihu open water.Furthermore,CDOM absorption decreases gradually from the upstream of rivers to the river mouths,and to the Taihu Lake.It is thus clear that the three rivers are the major sources of allochthonous pollutants in the Taihu Lake during summer rainy seasons.In addition,the parallel factor analysis of the three-dimensional CDOM fluorescent excitation-emission matrix spectra reveals the presence of four fluorescent components.The component 1 and component 2 can be characterized as the protein-like fluorescence,and the rests are the humic-like fluorescence.The intensity of the latter decreases gradually from the river mouth to the open water of the lake,and the opposite is true for the protein-like fluorescence intensity.This analysis shows that the humic-like fluorescent dissolved organic matter in the Taihu comes mainly from the upstream rivers.

     

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