| 长江流域溶解性有机质光谱特征及其对自然和人为活动的响应 |
| 摘要点击 488 全文点击 72 投稿时间：2024-03-26 修订日期：2024-05-27 |
| 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 溶解性有机质（DOM） 三维荧光光谱 紫外-可见光谱 长江流域 平行因子法（PARAFAC） 区域积分法 |
| 英文关键词 dissolved organic matter（DOM） three-dimensional fluorescence spectroscopy UV-vis spectrum Yangtze River Basin parallel factor method regional integral method |
| 作者 | 单位 | E-mail | | 张子寒 | 安徽大学资源与环境工程学院, 合肥 230601
安徽省矿山生态修复工程实验室, 合肥 230601 | 2386647875@qq.com | | 陈星 | 安徽省矿山生态修复工程实验室, 合肥 230601
安徽建筑大学环境与能源工程学院, 合肥 230601 | | | 李海彬 | 安徽建筑大学环境与能源工程学院, 合肥 230601 | | | 谢发之 | 安徽建筑大学环境与能源工程学院, 合肥 230601 | | | 付心怡 | 安徽大学资源与环境工程学院, 合肥 230601
安徽省矿山生态修复工程实验室, 合肥 230601 | | | 马天启 | 安徽大学资源与环境工程学院, 合肥 230601
安徽省矿山生态修复工程实验室, 合肥 230601 | | | 董想 | 安徽大学资源与环境工程学院, 合肥 230601
安徽省矿山生态修复工程实验室, 合肥 230601 | | | 何茜 | 安徽大学资源与环境工程学院, 合肥 230601
安徽省矿山生态修复工程实验室, 合肥 230601 | | | 郑刘根 | 安徽大学资源与环境工程学院, 合肥 230601
安徽省矿山生态修复工程实验室, 合肥 230601 | lgzheng@ustc.edu.cn |
|
| 中文摘要 |
| 溶解性有机质（DOM）参与许多生物地球化学过程,在水生生态系统扮演重要角色. 长江上中下游土地利用类型差异显著,在长距离运移中,DOM的分布特征和光学特性及其对自然和人为活动的响应差异较大. 基于此,系统采集长江流域上中下游84个水体样品,采用紫外-可见光谱（UV-vis）、三维荧光光谱结合荧光区域积分（FRI）和平行因子分析（PARAFAC）解析了长江流域DOM的分布和组分特征,并探讨了DOM对自然和人为活动的响应. 结果表明：①长江流域ρ（DOC）平均值为3.17 mg·L-1,上、中、下游ρ（DOC）平均值分别为2.75、3.24、4.83 mg·L-1,呈上升趋势；②FRI显示,长江流域DOM中类腐植酸（PⅤ）相对丰度最高,平均值为60.77%,PARAFAC解析出3种荧光组分,分别为C1（UAC类腐殖质）、C2（类色氨酸）和C3（UV类腐殖质）；③长江流域DOM总体受微生物源和陆源共同输入影响,上游DOM生物源指数（BIX）较低,以陆源输入为主；中游DOM中芳香物质、疏水性组分较多,表现为强腐殖质和微弱新进自生源特征；下游DOM相对分子质量小,自生源特征明显,受微生物活动影响显著. 研究结果有助于在区域尺度上准确识别DOM的生物地球化学循环,为长江流域水资源管理和水环境保护提供依据. |
| 英文摘要 |
| Dissolved organic matter （DOM） is involved in many biogeochemical processes and plays an important role in aquatic ecosystems. Notable differences appear in land use types in the upper, middle, and lower reaches of the Yangtze River, and the distribution characteristics and optical properties of DOM and its response to natural and anthropogenic activities vary greatly in long-distance transport. This study systematically collected 84 water samples from the upper, middle, and lower reaches of the Yangtze River Basin and used ultraviolet-visible spectroscopy （UV-vis）, three-dimensional fluorescence spectroscopy combined with fluorescence region integration （FRI）, and parallel factor analysis （PARAFAC） to analyze the distributional and compositional characteristics of DOM in the Yangtze River Basin and to explore the response of DOM to natural and anthropogenic activities. The results showed that： ① The average DOC concentration in the Yangtze River Basin was 3.17 mg·L-1, and the average DOC concentrations in the upper, middle, and lower reaches of the river were 2.75, 3.24, and 4.83 mg·L-1, respectively, showing an upward trend. ② The FRI showed that humic acid-like fractions （PⅤ） accounted for the highest percentage of DOM in the Yangtze River Basin, with an average value of 60.77%, and PARAFAC resolved three fluorescent components, namely C1 （UAC-like humic acid）, C2 （tryptophan-like）, and C3 （UV-like humic acid）. ③ DOM in the Yangtze River Basin was generally affected by the input of microbial and terrestrial sources together, and the upstream DOM had a low biogenicity index （BIX）, which was dominated by terrestrial inputs. The middle reaches of the DOM had a higher number of aromatic substances, and hydrophobicity components were more abundant, showing strong humus and weakly neophytic autochthonous source characteristics. The downstream DOM had small relative molecular mass and obvious autochthonous source characteristics and was substantially affected by microbial activities. The results of this study can help to identify the biogeochemical cycles of DOM on a regional scale and provide a basis for water resource management and water environment protection in the Yangtze River Basin. |
|
|
|
