Microbial bioavailability of dissolved organic matter in Qingdao coastal green tide area
WANG Zi-hao1, FENG Li-na2, ZAHNG Chuan-song1, SHI xiao-yong1,3
1. Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; 2. Weifang Municipal, Shandong Provincial Ecological and environment Monitoring Center, Weifang 261041, China; 3. Ministry of Natural Resources, Marine Hazard Mitigation Service, Beijing 100194, China
Abstract:Dissolved organic matter (DOM) in the green tide region of Qingdao coastal was studied through indoor degradation experiments, the degradation efficiency of Dissolved organic carbon(DOC) in different seawater was calculated, and the fluorescent components and their variation of colored dissolved organic matter(CDOM) in the water were analyzed. The results showed that DOC in different sites and periods influenced by green tide had all been degraded, and the degradation process accorded with the first-order degradation kinetic equation, in which about 8.93%~45.10% of DOC could be utilized by microorganisms, and the degradation rate of the samples greatly affected by the outbreak of Ulva prolifera green tide was the highest. Based on usage of three-dimensional excitation and emission matrix fluorescence spectroscopy and parallel factor analysis, it was determined that CDOM in green tide water contains three humus components (C1, C2, C3) and one protein component (C4), and the content of protein like components in all samples was significantly higher than that of each single humus component, indicating that the main component of CDOM released by Ulva prolifera green tide is protein like component. In the degradation experiment, the change of protein like components was the same as the degradation trend of DOC content, while humus like components gradually increased. Meanwhile, the results of the support vector machine weight analysis and results of correlation analysis between the fluorescence parameters of CDOM and the percentage content of bioavailable dissolved organic carbon (BDOC%) showed that compared with BDOC, C4component was positively correlated and C1component was negatively correlated, indicating that the correlation between BDOC and CDOM components is very high. It can be inferred that protein-like component and BDOC are easy to be degraded and utilized by microorganisms, and humus-like component is more closely related to RDOC(refractory dissolved organic carbon). This study revealed the changes of DOM content in water during the Ulva prolifera green tide period and its corresponding relationship with different fluorescent components, which could provide a theoretical basis for explaining the causes of secondary ecological disasters caused by Ulva prolifera green tide, and could quickly infer the content of BDOC by using CDOM components and DOC, which offers convenience for marine field investigation.
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