Climatically-modulated decline in wind speed may strongly affect eutrophication in shallow lakes

被引:128
作者
Deng, Jianming [1 ,2 ,6 ]
Paerl, Hans W. [3 ,4 ]
Qin, Boqiang [1 ,6 ]
Zhang, Yunlin [1 ,6 ]
Zhu, Guangwei [1 ,6 ]
Jeppesen, Erik [2 ,5 ]
Cai, Yongjiu [1 ,6 ]
Xu, Hai [1 ,6 ]
机构
[1] Chinese Acad Sci, Nanjing Inst Geog & Limnol, Taihu Lake Lab Ecosyst Res Stn, State Key Lab Lake Sci & Environm, Nanjing 210008, Jiangsu, Peoples R China
[2] Aarhus Univ, Dept Biosci, Vejlsovej 25, DK-8600 Silkeborg, Denmark
[3] Univ North Carolina Chapel Hill, Inst Marine Sci, 3431 Arendell St, Chapel Hill, NC 28557 USA
[4] Hohai Univ, Coll Environm, Nanjing 210098, Jiangsu, Peoples R China
[5] Univ Chinese Acad Sci, Sino Danish Ctr Educ & Res SDC, Beijing 100049, Peoples R China
[6] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
关键词
Daily stratification; Internal loading; Water quality; Lake management; Atmospheric stilling; MICROCYSTIS SPP. BLOOMS; CLIMATE-CHANGE; NUTRIENT RELEASE; NITROGEN REMOVAL; THERMAL STRATIFICATION; PHYTOPLANKTON DYNAMICS; TAIHU LAKE; SEDIMENT; PHOSPHORUS; HYPOXIA;
D O I
10.1016/j.scitotenv.2018.07.208
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Surface wind speed has declined significantly globally. However, the response of aquatic systems to decreasing wind speeds has received little attention. We examined the effects of a long-term decrease in wind speed on shallow, eutrophic Lake Taihu, China's third largest lake, by combining high-frequency monitoring, long-term meteorological and water quality data with short-term laboratory sediment nutrient release experiments. The annual mean wind speed showed a significant decreasing trend and the maximum continuous days with wind speed <3 m/s increased significantly from 1996 to 2017. The high-frequency monitoring data showed that bottom water hypoxia occurred occasionally in summer and autumn. The water quality data combined with the experimental results suggest that lower wind speed and longer low wind duration can enhance the release of phosphorus (P) from the sediments and increase nitrogen (N) losses, likely via denitrification, because a longer stability period leads to lower dissolved oxygen concentrations near the lake bottom. The results of Bayesian functional Linear regression with Sparse Step functions (Bliss) indicated that wind speed during spring and summer strongly affected chlorophyll a (Chla) concentrations in the summer by enhancing the release of nutrients from the sediments. The results of the structural equation models indicated that declined wind speed might increase phytoplankton biomass (as Chla) by altering nutrient availability. Increasing water temperatures and decreasing wind speeds synergistically enhance water column stability, which may offset some of the immediate benefits of reductions in external nutrient loading by enhancing internal loading. Given predicted global change, it will become increasingly important to reduce the external nutrient loading for overall improvement of water quality in this and other shallow eutrophic lakes. (c) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码:1361 / 1370
页数:10
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