Lake Taihu, a large, shallow and eutrophic aquatic ecosystem in China serves as sink.pdf

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Lake Taihu, a large, shallow and eutrophic aquatic ecosystem in China serves as sink.pdf

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Lake Taihu, a large, shallow and eutrophic aquatic ecosystem in China serves as sink

Journal of Great Lakes Research 41 (2015) 597–606 Contents lists available at ScienceDirect Journal of Great Lakes Research j ourna l homepage: www.e lsev ie r .com/ locate / jg l rLake Taihu, a large, shallow and eutrophic aquatic ecosystem in China serves as a sink for chromophoric dissolved organic matterYongqiang Zhou a,b, Yunlin Zhang a,?, Kun Shi a, Cheng Niu a,b, Xiaohan Liu a,b, Hongtao Duan a a Taihu Lake Laboratory Ecosystem Research Station, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 73 East Beijing Road, Nanjing 210008, China b University of Chinese Academy of Sciences, Beijing 100049, China? Corresponding author. Tel.: +86 25 fax: + E-mail address: ylzhang@ (Y. Zhang). /10.1016/j.jglr.2015.03.027 0380-1330/? 2015 International Association for Great Laka b s t r a c ta r t i c l e i n f oArticle history: Received 19 June 2014 Accepted 3 March 2015 Available online 11 April 2015 Communicated by Noel Urban Index words: Chromophoric dissolved organic matter (CDOM) Excitation–emission matrices (EEMs) Parallel factor analysis (PARAFAC) CDOM and DOC removal ratesPhotochemical reactions and microbial activity often result in chromophoric dissolved organic matter (CDOM) being lost to downstream cycles. The role of a specific lake ecosystem serving as a sink for CDOMwas elucidated in Lake Taihu, China. The lake was divided into CDOM-enriched and CDOM-depleted regions based on principal component analysis (PCA) results. The spatial distribution of molecular size (M), spectral slope ratio (SR) and humification index (HIX) of CDOM suggested that CDOM in Lake Taihu was mainly from exogenous sources. Parallel factor analysis (PARAFAC) identified four components, including a microbially humic-like component (C1), two protein-like components (C2 and C3) and a terrestrial humic-like component (C4). Strong conservative mixing behaviors of C4 and C1 were observed in the lake, an