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| The Bioavailability Characteristics of CDOM in Lake Hongze and Lake Luoma under Different Hydrological Scenarios |
| ZHANG Liu-qing1,2, PENG Kai1,3, YANG Yan2, SHI Yu1, LI Yuan-peng1, ZHOU Lei1,3, ZHOU Yong-qiang1,3*, ZHANG Yun-lin1,3 |
1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
2. College of Environment Science and Engineering, China West Normal University, Nanchong 637000, China
3. University of Chinese Academy of Sciences, Beijing 100049, China |
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Abstract We investigated the bioavailability characteristics of chromophoric dissolved organic matter (CDOM) in different hydrological scenarios of Lake Hongze and Lake Luoma using bio-incubation experiments coupled with excitation-emission matrices and parallel factor analysis (EEMs-PARAFAC). The results showed that (1) Three fluorescent components were obtained using PARAFAC, including a humic-like C1, a tryptophan-like C2 and a tyrosine-like C3. (2) After 28 days of bio-incubation, the bioavailability of dissolved organic carbon (BDOC) in Lake Hongze and Lake Luoma in dry season (17%±4% and 15%±4%) was higher than that in flood season (5%±5% and 10%±7%), and the high %BDOC values of the two lakes were mainly distributed in the inflowing river mouths. (3) The specific absorbance at 254 nm SUVA254 and humic-like components in the two lakes during dry season was significantly higher than that pre-bio-incubation, and ΔSUVA254 and ΔC1 were negative. The tyrosine-like component was significantly lower than that pre-bio-incubation and ΔC3 was positive, indicating that the microorganisms preferentially utilized the less stable tyrosine-like component in the dry season, and produced more stable humic-like C1 and also increased the humification of the samples collected from the two lakes. (4) There were significant negative correlations between BDOC, %BDOC and ΔSUVA254, ΔC3, %ΔC3, respectively. These results indicated that CDOM optical composition directly affects its bioavailability in the two lakes.
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Received: 2019-06-18
Accepted: 2019-09-27
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Corresponding Authors:
ZHOU Yong-qiang
E-mail: yqzhou@niglas.ac.cn
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