| 蓝藻衰亡过程中上覆水溶解性有机物变化特征 |
| 摘要点击 2291 全文点击 690 投稿时间：2020-11-28 修订日期：2020-12-26 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 蓝藻水华 溶解性有机物(DOM) 上覆水 平行因子分析(PARAFAC) 相关性分析 |
| 英文关键词 algae blooms dissolved organic matter (DOM) overlying water parallel factor analysis (PARAFAC) correlation analysis |
| 作者 | 单位 | E-mail | | 李翔 | 南京师范大学环境学院, 南京 210023
江苏省地理信息资源开发与利用协同创新中心, 江苏省环境演变与生态建设重点实验室, 江苏省水土环境生态修复工程实验室, 南京 210023 | 763225180@qq.com | | 李致春 | 南京师范大学环境学院, 南京 210023
江苏省地理信息资源开发与利用协同创新中心, 江苏省环境演变与生态建设重点实验室, 江苏省水土环境生态修复工程实验室, 南京 210023
宿州学院环境与测绘工程学院, 宿州 234000 | | | 汪旋 | 南京师范大学环境学院, 南京 210023
江苏省地理信息资源开发与利用协同创新中心, 江苏省环境演变与生态建设重点实验室, 江苏省水土环境生态修复工程实验室, 南京 210023 | | | 张思远 | 南京师范大学环境学院, 南京 210023
江苏省地理信息资源开发与利用协同创新中心, 江苏省环境演变与生态建设重点实验室, 江苏省水土环境生态修复工程实验室, 南京 210023 | | | 王慧敏 | 南京师范大学环境学院, 南京 210023 | | | 厉荣强 | 南京师范大学环境学院, 南京 210023 | | | 王国祥 | 南京师范大学环境学院, 南京 210023
江苏省地理信息资源开发与利用协同创新中心, 江苏省环境演变与生态建设重点实验室, 江苏省水土环境生态修复工程实验室, 南京 210023 | guoxiangwang@yeah.net | | 李启蒙 | 南京师范大学环境学院, 南京 210023
江苏省地理信息资源开发与利用协同创新中心, 江苏省环境演变与生态建设重点实验室, 江苏省水土环境生态修复工程实验室, 南京 210023 | |
|
| 中文摘要 |
| 为探究蓝藻水华衰亡过程中溶解性有机物（DOM）的迁移转化机制，本文对蓝藻衰亡过程进行室内模拟实验，基于紫外-可见光谱（UV-vis）和三维荧光光谱（EEMs）表征上覆水溶解性有机物的光谱特征，同时分析水质理化指标及溶解性有机碳（DOC）、溶解性无机碳（DIC）含量变化.结果表明，蓝藻衰亡初期阶段释放出大量有机质，溶解氧（DO）急剧降低，随着反应时间延长，DOC逐渐转变为DIC，改变了水体氧化还原环境和酸碱环境；UV-vis光谱显示蓝藻衰亡释放出大量芳香性很高、腐殖化程度高的DOM，并且DOM随反应时间被逐渐降解.通过三维荧光光谱平行因子分析（EEM-PARAFAC），解析出3种荧光组分，分别为难降解的类腐殖质（C1），藻类产生的类蛋白质色氨酸（C2），以及与微生物活动有关的类腐殖质富里酸（C3）.蓝藻衰亡产生的类蛋白质大部分被微生物降解成类富里酸，异养型微生物促进了藻源性DOM的生成，同时也加快了对新生DOM的降解.蓝藻衰亡产生的DOM最终大部分转化为较难降解类腐殖质.对水质参数、UV-vis光谱和EEMs光谱参数进行相关性分析可知，ORP与DO呈显著正相关（P<0.05），pH与DOC呈显著负相关（P<0.05），与DOC向DIC转变趋势相吻合；C1与Fn355有显著正相关关系（P<0.05），C2与DOC和Fn280都有显著正相关关系（P<0.05），C3与FI、BIX以及β∶α呈显著正相关（P<0.05），这些光谱参数的变化趋势与DOM组分变化一致.综上所述，通过对蓝藻水华衰亡过程中上覆水DOM的水质特征和光谱特征的探究，为分析湖泊DOM的动态迁移转化和碳循环的变化提供技术支持. |
| 英文摘要 |
| In this study, indoor simulation experiments were performed to elucidate the effects of migration and transformation of dissolving organic matter (DOM) during the decay of algal blooms. Based on ultraviolet-visible spectra (UV-vis) and excitation-emission matrix spectroscopy (EEMs), spectral characterizations of dissolved organic matter (DOM) in overlying water were evaluated with analyses of the physical and chemical indexes, variation in dissolved organic carbon (DOC), and variation in dissolved inorganic carbon (DIC). Results showed that at the early stage of decay, a large amount of organic matter was released, and dissolved oxygen (DO) decreased sharply. With the extension of reaction time, DOC gradually changed into DIC, which further changed the oxidation-reduction and acid-base characteristics of the water. UV-vis spectra showed that a large amount of DOM was released with high aromaticity and a high degree of humification, and the released DOM was gradually degraded. With the application of parallel factor analysis in excitation-emission matrix spectroscopy (EEM-PARAFAC), three fluorescence components were analyzed:refractory humic-like substances (C1), protein-like tryptophan substances (C2) produced by algae, and fulvic-like substances (C3) related to microbial activities. Most protein-like tryptophan substances were degraded into fulvic-like substances by microorganisms during the decaying process. Heterotrophic microorganisms promoted the release of algae-derived DOM and accelerated the degradation of DOM. The DOM born during algae blooms decaying process was eventually converted into humic-like substance, which was difficult to be degraded. We analyzed correlations of water quality, UV-vis spectrum, and EEMs parameters. Results showed that ORP was positively correlated (P<0.05) with DO. There was a significant negative correlation (P<0.05) between pH and DOC, which was consistent with the trend of the transformation to from DOC to DIC; C1 was positively correlated (P<0.05) with Fn355; and C2 was significantly positively correlated (P<0.05) with DOC and Fn280; C3 was positively correlated (P<0.05) with FI, BIX and β:α. The variation trend of these spectral parameters was consistent with that of DOM components. In summary, with the analyses of water quality characteristics and spectral characteristics of DOM in overlying water during algae blooms decaying process, it was expected that our results could contribute to the further exploration of the dynamic migration and transformation of lake DOM and the changes of carbon cycling. |
|
|
|
