| 典型北方城市水系不同区域DOM分布特征及环境响应 |
| 摘要点击 1244 全文点击 178 投稿时间：2024-01-19 修订日期：2024-04-01 |
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| 中文关键词 城市水系 溶解有机质（DOM） 紫外-可见光谱（UV-vis） 三维荧光光谱 平行因子分析（PARAFAC） 冗余分析（RDA） |
| 英文关键词 urban water system dissolved organic matter （DOM） ultraviolet-visible spectroscopy（UV-vis） three-dimensional fluorescence spectroscopy parallel factor analysis （PARAFAC） redundancy analysis （RDA） |
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| 中文摘要 |
| 为探索北方城市不同区域水体中溶解性有机质（DOM）来源信息及成分特征,以河北省石家庄城市水系为例,使用紫外-可见光谱（UV-vis）和三维荧光平行因子分析（EEM-PARAFAC）解释了不同区域水体DOM的光学参数、不同组分的丰度及占比状况. 结果表明：①上游NO3--N、NO2--N、NH4+-N、TN、TP和COD的浓度显著低于城市水体和下游（P<0.01）,且水体流入城市后富营养化TSIM升高. ②紫外参数a254表明,水体在流入城市后DOM的浓度显著升高（P<0.001）,E2/E3显示不同区域水体DOM相对分子质量大小为：上游<城市水体<下游,且不同区域水体DOM的SR>1,表明石家庄市DOM的来源主要为内源输入. ③水体DOM共解析出3种荧光组分,分别为C1类富里酸（可见光区富里酸）、C2类蛋白（色氨酸）和C3长波类腐殖质,上游与城市水体以类蛋白组分为主（C2）, 而下游类腐殖质（C1+C3）占比较高（80.1%）,且PCA分析表明不同区域水体DOM呈现显著的空间分布差异,荧光参数显示不同区域水体DOM的SR>1、FI>1.8,HIX<4,表明水体DOM呈现出低腐殖化,强自生源的特征. ④城市上游和下游水体中C1与C3呈显著相关（P<0.01）,城市水体中C1、C2和C3均显著相关（P<0.01）,另外C1与C3在不同区域水体中均与NO3--N呈现出显著相关性,RDA结果显示NO2--N、TDN、TDP和COD主要影响DOM的空间分布. 综上,城市多重压力作用对流经水系的DOM光谱性质存在显著影响. |
| 英文摘要 |
| To explore the source information and composition characteristics of dissolved organic matter （DOM） in different regions of water bodies in northern cities, considering the urban water system of Shijiazhuang, Hebei Province as an example, ultraviolet-visible spectroscopy （UV-vis） and three-dimensional fluorescence parallel factor analysis （EEM-PARAFAC） were used to explain the optical parameters, abundance, and proportion of different components of DOM in water bodies of different regions. The results showed that： ① The concentrations of NO3--N, NO2--N, NH4+-N, TN, TP, and COD in the upstream were significantly lower than those in urban water bodies and downstream （P<0.01）, and TSIM increased after the water entered the city. ② The ultraviolet parameter a254 indicated that the concentration of DOM significantly increased after entering the city （P<0.001）. E2/E3 showed that the relative molecular weight of DOM in different regions was： upstream<urban water<downstream, and the SR of DOM in different regions was >1, indicating that the main source of DOM was endogenous input. ③ Three fluorescent components were identified, namely C1 （visible light region fulvic acid）, C2 （tryptophan）, and C3 （long wave humic substance）. The upstream and urban water bodies were mainly composed of protein-like components （C2）, while the downstream humic substances （C1+C3） accounted for a relatively high proportion （80.1%）. The PCA analysis showed significant spatial distribution differences. According to the results, SR>1, FI>1.8, and HIX<4 indicated that DOM exhibited low humification and strong autogenesis in different regions. ④ A significant correlation （P<0.01） was observed between C1 and C3 in the upstream and downstream. C1, C2, and C3 in urban water bodies were all significantly correlated （P<0.01）. In addition, C1 and C3 posed a significant correlation with NO3--N in different regional water bodies. RDA indicated that NO2--N, TDN, TDP, and COD were the main environmental driving factors for DOM distributions. In summary, the multiple pressures of the city exhibited a significant influence on the spectral properties of DOM in the flowing water system. |
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