Distributions of amino acids and their indications for the degradation of dissolved organic matter in the northern South China Sea

Chen Yan; Yang Guipeng; Ji Chongxiao; Yang Cheng

doi:10.3969/j.issn.0253-4193.2017.09.006

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Chen Yan, Yang Guipeng, Ji Chongxiao, Yang Cheng. Distributions of amino acids and their indications for the degradation of dissolved organic matter in the northern South China Sea[J]. Haiyang Xuebao, 2017, 39(9): 58-70. doi: 10.3969/j.issn.0253-4193.2017.09.006

Citation:

Chen Yan, Yang Guipeng, Ji Chongxiao, Yang Cheng. Distributions of amino acids and their indications for the degradation of dissolved organic matter in the northern South China Sea[J]. Haiyang Xuebao, 2017, 39(9): 58-70. doi: 10.3969/j.issn.0253-4193.2017.09.006

Citation:

Chen Yan, Yang Guipeng, Ji Chongxiao, Yang Cheng. Distributions of amino acids and their indications for the degradation of dissolved organic matter in the northern South China Sea[J]. Haiyang Xuebao, 2017, 39(9): 58-70. doi: 10.3969/j.issn.0253-4193.2017.09.006

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Distributions of amino acids and their indications for the degradation of dissolved organic matter in the northern South China Sea

doi: 10.3969/j.issn.0253-4193.2017.09.006

1.
Key Laboratory of Marine Chemistry Theory and Technology, College of Chemistry and Chemical Engineering, Ocean University of China, Ministry of Education, Qingdao 266100, China
2.
Key Laboratory of Marine Chemistry Theory and Technology, College of Chemistry and Chemical Engineering, Ocean University of China, Ministry of Education, Qingdao 266100, China;Marine Ecology and Environmental Science Laboratory, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China

Received Date: 2017-04-03
Rev Recd Date: 2017-06-04

Abstract

Abstract

Concentrations of dissolved amino acid (THAA), dissolved organic carbon (DOC) and chlorophyll a(Chl a) were determined in five transects of the northern South China Sea (NSCS) in June 2015. The results showed that the concentrations of THAA ranged from 0.40 to 1.95 μmol/L, with an average of (0.80±0.40) μmol/L. THAA concentrations exhibited a decreasing trend from the nearshore to offshore stations, indicating that terrestrial input plays an important role in affecting the distributions of THAA. The vertical distribution of THAA concentrations displayed a decreasing trend from the surface layer to the bottom layer. The present study found that the concentrations of THAA were negatively correlated to the D-amino acids (D-Glu and D-Ala), but positively correlated to Asp/β-Ala and Glu/γ-Aba ratios. Our results indicated that the bacterial consumption was an important factor influencing the concentration of THAA in the NSCS. The contribution of bacterial organic carbon to DOC was (29.32 ±14.32)% in the NSCS, exhibiting increasing trends from the nearshore to offshore sites and from the surface waters to the bottom waters. High values of carbon normalized yields of amino acids (THAA-C%), reactivity index and degradation index (DI) were found in the area near the Zhujiang Estuary. With the increasing of the water depth, the values of the degradation factors were significantly decreased, reflecting the higher degradation extent of organic matter in the bottom waters.
- dissolved amino acid,
- dissolved organic carbon,
- bacterial degradation,
- South China Sea

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