Silica retention in the Three Gorges Reservoir

doi:10.1007/s10533-012-9717-0

CORC > 自然资源部第一海洋研究所 > 自然资源部第一海洋研究所 > 业务部门 > 海洋生态研究中心

	Silica retention in the Three Gorges Reservoir
	Ran, Xiangbin 1,2; Yu, Zhigang 1; Yao, Qingzhen 1; Chen, Hongtao 1; Guo, Hongbo 3,4
	2013-03
关键词	Biogenic silica Dissolved silicate Retention Three Gorges Reservoirs
卷号	112
期号	1-3
DOI	10.1007/s10533-012-9717-0
页码	209-228
英文摘要	A mass balance of dissolved silica (DSi) based on daily measurements at the inflow and outflow of the Three Gorges Reservoir (TGR) in 2007 and a more precise budget, with inflow, outflow, primary production, biogenic silica (BSi) settlement, dissolution of BSi in the water column and flux of DSi at the sediment-water interface in the dry season (April) of 2007 were developed. We address the following question: How much does the Three Gorges Dam (TGD) affect silica transport in the TGR of the Changjiang River (Yangtze River)? The DSi varied from 71.1 to 141 mu mol/l with an average of 108 mu mol/l, and it ranged between 68.1 and 136 mu mol/l, with an average of 107 mu mol/l in inflow and outflow, respectively, in the TGR in 2007. The linear relationship of DSi between inflow and outflow water is significant (r = 0.87, n = 362, p < 0.01). Along the main stream of the TGR, the DSi concentration decreases with an average concentration of 84.0 mu mol/l in the dry season. However, the stratification of DSi was not obvious in the main channel of the TGR in the dry season. The BSi is within the range of 0.04-5.00 mu mol/l, with an average concentration of 2.1 mu mol/l in the main channel of the TGR, while it is much higher in Xiangxi Bay (1.30-47.7 mu mol/l, 13.1 mu mol/l) than in the main stream of the TGR and the other bays. After the third filling of the TGR, approximately 3.8% of the DSi was retained by the TGR based on a 12-month monitoring scheme in 2007, which would slightly reduce nutrient fluxes of the Changjiang River to the East China Sea (2%). DSi was lost during January to June and November, whereas the additions of DSi were found during the other months in 2007. The budget results also indicate that there is a slight retention of DSi. The retention of DSi in the reservoir is approximately 2.9%, while BSi is approximately 44%. Compared with the total silica load, the retention of DSi and BSi in the reservoir is only 5.0% in the dry season. With its present storage capacity, the reservoir does not play an important role as a silica sink in the channel of the TGR. The DSi load is significantly related to discharge both in inflow and outflow waters (p < 0.01). DSi retention, to some extent, is the runoff change due to impoundment.
会议录	BIOGEOCHEMISTRY
会议录出版者	SPRINGER
会议录出版地	VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology
WOS记录号	WOS:000316018800016
内容类型	会议论文
源URL	[http://ir.fio.com.cn/handle/2SI8HI0U/5181]
专题	业务部门_海洋生态研究中心
作者单位	1.Ocean Univ China, Minist Educ, Key Lab Marine Chem Theory & Technol, Qingdao 266100, Peoples R China; 2.State Ocean Adm, Inst Oceanog 1, Res Ctr Marine Ecol, Qingdao 266061, Peoples R China; 3.Ocean Univ China, Minist Educ, Key Lab Marine Environm Sci & Ecol, Qingdao 266100, Peoples R China; 4.Tianjin Environm Monitoring Ctr, Tianjin 300191, Peoples R China
推荐引用方式 GB/T 7714	Ran, Xiangbin,Yu, Zhigang,Yao, Qingzhen,et al. Silica retention in the Three Gorges Reservoir[C]. 见:.