Using temporal coherence to determine the responses of water clarity to hydrological processes in a giant subtropical canyon-shaped reservoir (China)

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	Using temporal coherence to determine the responses of water clarity to hydrological processes in a giant subtropical canyon-shaped reservoir (China)
	Xu, Yaoyang 1,2; Shao, Meiling 1; Cao, Ming 1,2; Zhou, Shuchan 1; Cai, Qinghua 1
刊名	QUATERNARY INTERNATIONAL
	2010-10-15
卷号	226 期号:1-2 页码:151-159
关键词	PARANA RIVER FLOODPLAIN LAKE CHEMICAL RESPONSES CLIMATE-CHANGE DIFFERENT ENVIRONMENTS SYNCHRONOUS VARIATION NORTHERN WISCONSIN GORGES RESERVOIR GREAT-LAKES XIANGXI BAY POPULATION
ISSN号	1040-6182
通讯作者	Cai, QH, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
中文摘要	Investigating whether different locations of a large lake exhibit synchronous or asynchronous fluctuations in limnological characteristics is essential to lake management. If synchronous fluctuations (termed as "temporal coherence") among sites are found to prevail, regional factors are likely to be the drivers; otherwise, local factors may be dominant. Here, this idea is tested at two spatial scales: the large scale being the mainstream of Three-Gorges reservoir (TGR, China) and the small scale being Xiangxi Bay of TGR. Data of transparency and chlorophyll a were gathered monthly at 26 sampling sites from July 2003 to July 2006 to evaluate temporal coherence for water clarity. High spatial and temporal variation in transparency (4-510 cm) and chlorophyll a (0.1-190.2 mu g/L) mark the system. For the mainstream of TGR, significant high temporal coherence of water clarity among sites (correlation analysis: 0.872 <= r <= 0.991, mean r = 0.960) was detected and the among-site correlations showed no significant relationship with geographical distance (Mantel test: r = -0.186, p > 0.05) or chlorophyll a (Mantel test: r = 0.249, p > 0.05). By contrast within Xiangxi Bay, lower synchronous fluctuations (correlation analysis: 0.396 <= r <= 0.971, mean r = 0.785) occurred, and the among-site correlations decreased with an increase in geographical distance (Mantel test: r = -0.715, p <0.01) and a decrease in temporal coherence of chlorophyll a (Mantel test: r = 0.893, p <0.01). Seasonal dynamics of water clarity were very well explained by inflow discharges (regression analysis: 0.771 <= R-2 <= 0.906) and water residence time (0.782 <= R-2 <= 0.918) in the mainstream, but not in Xiangxi Bay. The high coherency of the dynamics of water clarity in TGR mainstream is likely caused by regional hydrological processes driven by subtropical monsoon climate. For Xiangxi Bay, local processes such as phytoplankton dynamics may override the regional effects of hydrological processes, because the water clarity of this bay is strongly determined by phytoplankton bloom dynamics. (C) 2010 Elsevier Ltd and INQUA. All rights reserved.
英文摘要	Investigating whether different locations of a large lake exhibit synchronous or asynchronous fluctuations in limnological characteristics is essential to lake management. If synchronous fluctuations (termed as "temporal coherence") among sites are found to prevail, regional factors are likely to be the drivers; otherwise, local factors may be dominant. Here, this idea is tested at two spatial scales: the large scale being the mainstream of Three-Gorges reservoir (TGR, China) and the small scale being Xiangxi Bay of TGR. Data of transparency and chlorophyll a were gathered monthly at 26 sampling sites from July 2003 to July 2006 to evaluate temporal coherence for water clarity. High spatial and temporal variation in transparency (4-510 cm) and chlorophyll a (0.1-190.2 mu g/L) mark the system. For the mainstream of TGR, significant high temporal coherence of water clarity among sites (correlation analysis: 0.872 <= r <= 0.991, mean r = 0.960) was detected and the among-site correlations showed no significant relationship with geographical distance (Mantel test: r = -0.186, p > 0.05) or chlorophyll a (Mantel test: r = 0.249, p > 0.05). By contrast within Xiangxi Bay, lower synchronous fluctuations (correlation analysis: 0.396 <= r <= 0.971, mean r = 0.785) occurred, and the among-site correlations decreased with an increase in geographical distance (Mantel test: r = -0.715, p <0.01) and a decrease in temporal coherence of chlorophyll a (Mantel test: r = 0.893, p <0.01). Seasonal dynamics of water clarity were very well explained by inflow discharges (regression analysis: 0.771 <= R(2) <= 0.906) and water residence time (0.782 <= R(2) <= 0.918) in the mainstream, but not in Xiangxi Bay. The high coherency of the dynamics of water clarity in TGR mainstream is likely caused by regional hydrological processes driven by subtropical monsoon climate. For Xiangxi Bay, local processes such as phytoplankton dynamics may override the regional effects of hydrological processes, because the water clarity of this bay is strongly determined by phytoplankton bloom dynamics. (C) 2010 Elsevier Ltd and INQUA. All rights reserved.
学科主题	Geography, Physical; Geosciences, Multidisciplinary
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geography, Physical ; Geosciences, Multidisciplinary
研究领域[WOS]	Physical Geography ; Geology
关键词[WOS]	PARANA RIVER FLOODPLAIN ; LAKE CHEMICAL RESPONSES ; CLIMATE-CHANGE ; DIFFERENT ENVIRONMENTS ; SYNCHRONOUS VARIATION ; NORTHERN WISCONSIN ; GORGES RESERVOIR ; GREAT-LAKES ; XIANGXI BAY ; POPULATION
收录类别	SCI
资助信息	National Natural Science Foundation of China [30330140, 40671197]; CAS [KZCX2-YW-427]
语种	英语
WOS记录号	WOS:000283815300020
公开日期	2010-12-23
内容类型	期刊论文
源URL	[http://ir.ihb.ac.cn/handle/342005/13506]
专题	水生生物研究所_淡水生态学研究中心_期刊论文
作者单位	1.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Xu, Yaoyang,Shao, Meiling,Cao, Ming,et al. Using temporal coherence to determine the responses of water clarity to hydrological processes in a giant subtropical canyon-shaped reservoir (China)[J]. QUATERNARY INTERNATIONAL,2010,226(1-2):151-159.
APA	Xu, Yaoyang,Shao, Meiling,Cao, Ming,Zhou, Shuchan,&Cai, Qinghua.(2010).Using temporal coherence to determine the responses of water clarity to hydrological processes in a giant subtropical canyon-shaped reservoir (China).QUATERNARY INTERNATIONAL,226(1-2),151-159.
MLA	Xu, Yaoyang,et al."Using temporal coherence to determine the responses of water clarity to hydrological processes in a giant subtropical canyon-shaped reservoir (China)".QUATERNARY INTERNATIONAL 226.1-2(2010):151-159.