Flux characteristics of total dissolved iron and its species during extreme rainfall event in the midstream of the Heilongjiang River

CORC > 东北地理与农业生态研究所 > 水环境污染与防治学科组 > 期刊论文

	Flux characteristics of total dissolved iron and its species during extreme rainfall event in the midstream of the Heilongjiang River; Flux characteristics of total dissolved iron and its species during extreme rainfall event in the midstream of the Heilongjiang River
	J. N. Guan; B. X. Yan; H. Zhu; L. X. Wang; D. A. Lu; L. Cheng
刊名	Journal of Environmental Sciences-China ; Journal of Environmental Sciences-China
	2015 ; 2015
卷号	30 页码:74-80
通讯作者	阎百兴 ; 阎百兴
中文摘要	The occurrence of extreme rainfall events and associated flooding has been enhanced due to climate changes, and is thought to influence the flux of total dissolved iron (TDI) in rivers considerably. Since TDI is a controlling factor in primary productivity in marine ecosystems, alteration of riverine TDI input to the ocean may lead to climate change via its effect on biological productivity. During an extreme rainfall event that arose in northeastern China in 2013, water samples were collected in the midstream of the Heilongjiang River to analyze the concentration and species of TDI as well as other basic parameters. The speciation of TDI was surveyed by filtration and ultrafiltration methods. Compared with data monitored from 2007 to 2012, the concentration of TDI increased significantly during this event, with an average concentration of 1.11 mg/L, and the estimated TDI flux reached 1.2 x 10(5) tons, equaling the average annual TDI flux level. Species analysis revealed that low-molecular-weight complexed iron was the dominant species, and the impulse of TDI flux could probably be attributed to the hydrological connection to riparian wetlands and iron-rich terrestrial runoff. Moreover, dissolved organic matter played a key role in the flux, species and bioavailability of TDI. In addition, there is a possibility that the rising TDI flux could further influence the transport and cycling of nutrients and related ecological processes in the river, estuary coupled with the coastal ecosystems, which merits closer attention in the future. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.; The occurrence of extreme rainfall events and associated flooding has been enhanced due to climate changes, and is thought to influence the flux of total dissolved iron (TDI) in rivers considerably. Since TDI is a controlling factor in primary productivity in marine ecosystems, alteration of riverine TDI input to the ocean may lead to climate change via its effect on biological productivity. During an extreme rainfall event that arose in northeastern China in 2013, water samples were collected in the midstream of the Heilongjiang River to analyze the concentration and species of TDI as well as other basic parameters. The speciation of TDI was surveyed by filtration and ultrafiltration methods. Compared with data monitored from 2007 to 2012, the concentration of TDI increased significantly during this event, with an average concentration of 1.11 mg/L, and the estimated TDI flux reached 1.2 x 10(5) tons, equaling the average annual TDI flux level. Species analysis revealed that low-molecular-weight complexed iron was the dominant species, and the impulse of TDI flux could probably be attributed to the hydrological connection to riparian wetlands and iron-rich terrestrial runoff. Moreover, dissolved organic matter played a key role in the flux, species and bioavailability of TDI. In addition, there is a possibility that the rising TDI flux could further influence the transport and cycling of nutrients and related ecological processes in the river, estuary coupled with the coastal ecosystems, which merits closer attention in the future. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
WOS记录号	WOS:000353844800008
内容类型	期刊论文
源URL	[http://159.226.123.10/handle/131322/6483]
专题	东北地理与农业生态研究所_水环境污染与防治学科组_期刊论文
推荐引用方式 GB/T 7714	J. N. Guan,B. X. Yan,H. Zhu,et al. Flux characteristics of total dissolved iron and its species during extreme rainfall event in the midstream of the Heilongjiang River, Flux characteristics of total dissolved iron and its species during extreme rainfall event in the midstream of the Heilongjiang River[J]. Journal of Environmental Sciences-China, Journal of Environmental Sciences-China,2015, 2015,30, 30:74-80, 74-80.
APA	J. N. Guan,B. X. Yan,H. Zhu,L. X. Wang,D. A. Lu,&L. Cheng.(2015).Flux characteristics of total dissolved iron and its species during extreme rainfall event in the midstream of the Heilongjiang River.Journal of Environmental Sciences-China,30,74-80.
MLA	J. N. Guan,et al."Flux characteristics of total dissolved iron and its species during extreme rainfall event in the midstream of the Heilongjiang River".Journal of Environmental Sciences-China 30(2015):74-80.