Composition and variability in the export of biogenic silica in the Changjiang River and the effect of Three Gorges Reservoir

doi:10.1016/j.scitotenv.2016.07.125

	Composition and variability in the export of biogenic silica in the Changjiang River and the effect of Three Gorges Reservoir
	Ran, Xiangbin 1,2; Liu, Sen 1,3; Liu, Jun 1,4; Zang, Jiaye 1; Che, Hong 1,4; Ma, Yongxing 1; Wang, Yibin 1
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2016-11-15
卷号	571 页码:1191-1199
关键词	Biogenic silica Changjiang River Composition Export Dissolution
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2016.07.125
英文摘要	Silicon (Si) plays an essential role in biogeochemical processes, but is still poorly characterized in the river system. This study addressed the biogenic silica (BSi) composition, origin and variation in the Changjiang River, and estimated the impacts of natural processes and human activities on the river Si cycling. Our results indicate that phytoliths comprised 14%-64% of BSi, while diatoms accounted for 34%-85% of BSi. The Changjiang River transported 620 Gg yr(-1) of BSi and 2100 Gg yr(-1) of dissolved silicate (DSi) loadings, respectively; 55% of the BSi and 51% of the DSi fluxes are transported during the high discharge period from June to September. The Changjiang River carried phytolith BSi mostly comes from the middle and lower reaches area. The ratio of BSi/(BSi + DSi) has decreased from 0.47 before 1980 to 0.19 in 2013-2014 due to the direct retention of BSi. The BSi sedimentation in the Three Gorges Reservoir would cause a decrease of total reactive silica, but contribute to approximately 4%-16% of the DSi loading at the Jiangyin station due to its dissolution. This study demonstrates that phytoliths represent a significant contribution to the biogeochemical cycle of silica in coastal waters, and in stream process exerts a great influence on the river Si loading and cycling. (C) 2016 Elsevier B.V. All rights reserved.
资助项目	Natural Science Foundation of China[41106072] ; Natural Science Foundation of China[41376093]
WOS关键词	CHEMICAL-WEATHERING RATES ; YANGTZE-RIVER ; DISSOLVED SILICATE ; ORGANIC-CARBON ; MARINE ; RETENTION ; CHEMISTRY ; BASIN ; DISSOLUTION ; PHOSPHORUS
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000383930400119
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/26553]
专题	自然资源部第一海洋研究所
通讯作者	Ran, Xiangbin
作者单位	1.State Ocean Adm, Inst Oceanog 1, Res Ctr Marine Ecol, Qingdao 266061, Peoples R China 2.Univ Utrecht, Fac Geosci, Dept Earth Sci Geochem, NL-3508 TA Utrecht, Netherlands 3.State Ocean Adm, Tianjin Marine Environm Monitoring Cent Stn, Tianjin 300450, Peoples R China 4.Ocean Univ China, Minist Educ, Key Lab Marine Chem Theory & Technol, Qingdao 266100, Peoples R China
推荐引用方式 GB/T 7714	Ran, Xiangbin,Liu, Sen,Liu, Jun,et al. Composition and variability in the export of biogenic silica in the Changjiang River and the effect of Three Gorges Reservoir[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2016,571:1191-1199.
APA	Ran, Xiangbin.,Liu, Sen.,Liu, Jun.,Zang, Jiaye.,Che, Hong.,...&Wang, Yibin.(2016).Composition and variability in the export of biogenic silica in the Changjiang River and the effect of Three Gorges Reservoir.SCIENCE OF THE TOTAL ENVIRONMENT,571,1191-1199.
MLA	Ran, Xiangbin,et al."Composition and variability in the export of biogenic silica in the Changjiang River and the effect of Three Gorges Reservoir".SCIENCE OF THE TOTAL ENVIRONMENT 571(2016):1191-1199.