Seasonal variation and ecological risk assessment of dissolved organic matter in a peri-urban critical zone observatory watershed

CORC > 生态环境研究中心 > 中国科学院生态环境研究中心 > 城市与区域生态国家重点实验室

	Seasonal variation and ecological risk assessment of dissolved organic matter in a peri-urban critical zone observatory watershed
	Tang, Jianfeng; Wang, Wendong; Yang, Lei; Qiu, Qianlinglin; Lin, Meixia; Cao, Changli; Li, Xinhu
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2020-03-10
卷号	707 页码:1-9
关键词	Peri-urban ecosystem Dissolved organic matter Fluorescence excitation-emission matrix Parallel factor analysis Ecological risk Ecological vulnerability
ISSN号	0048-9697
英文摘要	Peri-urban ecosystems are among the most intensive areas in terms of competition between different ecosystem components. Dissolved organic matter (DOM) plays a significant role in aquatic carbon cycling. The chemical composition of DOM and associated potential ecological risks in peri-urban aquatic ecosystems are poorly understood. Herein, we used fluorescence excitation-emission matrix and parallel factor analysis (EEM-PARAFAC) to characterize DOM in a peri-urban critical zone observatory watershed in Eastern China. According to the theory of natural disaster risk formation, we calculated the ecological risk of DOM in the peri-urbanwatershed. Seasonal variation in DOM concentrations was observed, whereas fluorescent DOM concentrations were site-specific across four sub-watersheds. The analysis of DOM absorption properties revealed the presence of DOM components with high aromatic content and large molecular weight in the watershed. Four fluorescent components (two humic-like and two protein-like substances) were identified using the PARAFAC model. Spatial distribution analysis showed that DOM quality was mainly influenced by human activities, and the proportion of protein-like substance (C3) was strongly correlated with anthropogenic parameters. The distribution of optical indices indicated diverse sources of DOM in the watershed. Ecological risk related to DOM was greater in the dry season than the wet season. There was a slight risk in most areas, with an extreme risk in areas experiencing the most intensive human disturbance, which were also extremely or heavily vulnerable. The results emphasize the strong influence of human disturbance on the ecological risk of DOM in peri-urban aquatic ecosystems. Our study provides useful information for ecological risk assessment of DOM that is difficult to obtain using traditional chemical analysis. (C) 2019 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/44444]
专题	生态环境研究中心_城市与区域生态国家重点实验室
推荐引用方式 GB/T 7714	Tang, Jianfeng,Wang, Wendong,Yang, Lei,et al. Seasonal variation and ecological risk assessment of dissolved organic matter in a peri-urban critical zone observatory watershed[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020,707:1-9.
APA	Tang, Jianfeng.,Wang, Wendong.,Yang, Lei.,Qiu, Qianlinglin.,Lin, Meixia.,...&Li, Xinhu.(2020).Seasonal variation and ecological risk assessment of dissolved organic matter in a peri-urban critical zone observatory watershed.SCIENCE OF THE TOTAL ENVIRONMENT,707,1-9.
MLA	Tang, Jianfeng,et al."Seasonal variation and ecological risk assessment of dissolved organic matter in a peri-urban critical zone observatory watershed".SCIENCE OF THE TOTAL ENVIRONMENT 707(2020):1-9.