| 太湖颗粒态有机质的荧光特征及环境指示意义 |
| 摘要点击 2688 全文点击 979 投稿时间：2017-09-29 修订日期：2017-11-03 |
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| 中文关键词 三维荧光 平行因子分析法 颗粒态有机质 荧光特征 富营养化 |
| 英文关键词 three-dimensional excitation-emission matrix fluorescence spectra (EEMs) parallel factor analysis (PARAFAC) particulate organic matter (POM) fluorescent characteristics eutrophication |
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| 中文摘要 |
| 作为水体中有机质分解与营养盐再生的核心载体之一，颗粒态有机质（POM）是一个潜在的可以被生物利用的重要营养源，势必对水华的暴发产生重要的影响.本研究采集了太湖8个典型区域32个样品，利用三维荧光技术（EEMs）并结合平行因子分析法（PARAFAC）解析夏季太湖水体POM的荧光特征、来源及环境指示意义，并对POM与DOM荧光特征的差异性及草、藻型湖区POM的差异性进行了分析.结果表明，太湖POM共有5种荧光组分，分别是类色氨酸（C1和C2）、类腐殖质（C3和C4）及类酪氨酸（C5）；其中，C1与C2、C3与C4两两具有极显著相关关系，C5与C3、C4也具有极好的相关性；通过与已有文献中的DOM荧光特征进行比对发现，夏季太湖POM与DOM在组分构成、来源及其与水质参数的相关性上均存在差异性.夏季太湖POM既有外源输入，也有内源输入，但其荧光指数（FI、HIX、BIX）取值范围为1.78~2.35、0.3~2.7、0.8~1.1，表明内源特性相对强烈.类腐殖质荧光与TN、TP、Chla、COD、POC、SS均呈显著相关性，表明荧光分析法可以作为营养盐半定量分析的一个重要手段.藻型湖区POM类蛋白物质主要由类色氨酸和类酪氨酸构成，而草型湖区以类酪氨酸为主，没有或者有极少的类色氨酸荧光组分；值得注意的是，与藻型湖区相比，草型湖区含有较多的类酪氨酸荧光组分（t检验，P < 0.01）.藻型湖区POM类蛋白和类腐殖质荧光之间具有显著相关性，而草型湖区两者相关性不显著；藻型湖区POM类蛋白和类腐殖质荧光均与Chla呈显著相关性，而草型湖区仅类腐殖质荧光与Chla具有显著相关关系. |
| 英文摘要 |
| Thirty-two samples were collected from eight typical areas in Lake Taihu. Three-dimensional excitation-emission matrix fluorescence spectra (EEMs) and a parallel factor analysis (PARAFAC) were applied to investigate the fluorescence properties, the sources, and environmental significance of particulate organic matter (POM) from the overlying water in Lake Taihu in summer. Differences in fluorescence characteristics between POM and DOM (dissolved organic matter), and that in POM between the grass lake and the algal lake were further examined. There are five kinds of fluorophores in Lake Taihu:tyrosine-like fluorophores (C1 and C2), humic-like fluorophores (C3 and C4), and tryptophan-like fluorophores (C5), among which significant correlations were found between C1 and C2, C3 and C4, and C5 and two humic-like fluorophores (C4, C3). By comparing with the fluorescence characteristics of DOM from earlier studies, it is found that there are differences in compositions, sources, and correlations with water quality between POM and DOM in Lake Taihu in summer. In summer, the contribution of endogenous inputs to POM is greater than that of exogenous inputs in Lake Taihu because the ranges in the fluorescence indices, FI, BIX, and HIX, are 1.78-2.35, 0.3-2.7, and 0.8-1.1, respectively. Significant correlations have been found between humic-like fluorescent components and TN, TP, Chla, COD, POC, and SS, suggesting that fluorescence analysis can be used as an important method for a semi-quantitative analysis of nutrients. The protein-like components of the algal lake mainly consist of tryptophan and tyrosine, while that of the grass lake mainly contain tyrosine and a few tryptophan. It is worth noting that, the grass lake contains more tyrosine relative to the algal lake (t test, P < 0.01). Significant positive correlations between the protein-like and the humic-like fluorescence are found in the algal lake, while it is not significant in the grass lake. Significant positive correlations are found between the fluorescent components (protein-like and humic-like) and chlorophyll-a in the algal lake, while the correlation was only found between humic-like components and chlorophyll-a in the grass lake. |
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