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引用本文:刘明亮,张运林,秦伯强.太湖入湖河口和开敞区CDOM吸收和三维荧光特征.湖泊科学,2009,21(2):234-241. DOI:10.18307/2009.0212
LIU Mingliang,ZHANG Yunlin,QIN Boqiang.Characterization of absorption and three-dimensional excitation-emission matrix spectra of chromophoric dissolved organic matter at the river inflow and the open area in Lake Taihu. J. Lake Sci.2009,21(2):234-241. DOI:10.18307/2009.0212
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太湖入湖河口和开敞区CDOM吸收和三维荧光特征
刘明亮1,2, 张运林1, 秦伯强1
1.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室太湖湖泊生态系统研究站, 南京 210008;2.南京农业大学资源与环境科学学院, 南京 210095
摘要:
应用吸收和三维荧光光谱对2007年夏季太湖入湖河口和大太湖开敞区有色可溶性有机物(CDOM)浓度及来源进行研究.结果表明,河口区和开敞区CDOM吸收系数a(355)存在显著空间差异,河口区明显大于开敞区(ANOVA,P<0.001),a(355)最大值出现在大浦河口和竺山湾漕桥河口附近,最小值出现在东太湖和胥口湾.a(355)与溶解性有机碳、化学耗氧量浓度存在显著正相关.所有样品一般都含有4个明显的荧光峰,包括1个可见光区的类腐殖质荧光C峰,1个紫外光区的类腐殖酸荧光A峰,2个类蛋白荧光B峰和D峰.河口区外源输入的类腐殖质荧光非常强,显著大于开敞区(ANOVA,P<0.05),而河口区和开敞区类蛋白荧光没有显著性差异,反映开敞区除外源河流输入外,内源生物降解等对类蛋白荧光贡献增加.在河口区B、C峰的比值r(B/C)小于1,均值为0.62±0.14、在开敞区r(B/C)除12#是0.92,其他值均大于1,均值为1.12±0.13,初步判断r(B/C)可以作为区分CDOM来源的重要参数.CDOM吸收a(355)与类腐殖质荧光C峰、A峰均存在极显著的正相关,而与类蛋白荧光相关性则明显下降,与D峰存在显著正相关,与B峰没有显著相关.
关键词:  有色可溶性有机物  溶解性有机碳  三维荧光光谱  太湖
DOI:10.18307/2009.0212
分类号:
基金项目:国家自然科学基金重点项目(40730529);中国科学院知识创新工程方向性项目(KZCX2-YW-419)联合资助
Characterization of absorption and three-dimensional excitation-emission matrix spectra of chromophoric dissolved organic matter at the river inflow and the open area in Lake Taihu
LIU Mingliang1,2, ZHANG Yunlin1, QIN Boqiang1
1.Taihu Lake Laboratory Ecosystem Research Station, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.College of Resources and Environmental Sciences, Naniing Agricultural University, Nanjing 210095, P. R. China
Abstract:
lower than 1 with the average value of 0.62±0.14, but was larger than 1 at sample 12 with the average value of 1.12±0.13. The r(B/C) can be preliminary used to distinguish the composition and source of CDOM. Significantly positive correlations were found between CDOM absorption coefficient and the fluorescence intensities of peaks A, C, D, but no significant correlation found with peak B
Key words:  Chromophoric dissolved organic matter  dissolved organic carbon  three-dimensional excitation-emission matrix spectra  Lake Taihu
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