Indications of amino acids for the degradation of organic matter and bacterial sources in sediments of the Jiaozhou Bay

Zhou Bu; Yuan Huamao; Song Jinming; Li Xuegang; Li Ning; Duan Liqin; Ren Chengzhe

doi:10.3969/j.issn.0253-4193.2018.08.004

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Zhou Bu, Yuan Huamao, Song Jinming, Li Xuegang, Li Ning, Duan Liqin, Ren Chengzhe. Indications of amino acids for the degradation of organic matter and bacterial sources in sediments of the Jiaozhou Bay[J]. Haiyang Xuebao, 2018, 40(8): 29-41. doi: 10.3969/j.issn.0253-4193.2018.08.004

Citation:

Zhou Bu, Yuan Huamao, Song Jinming, Li Xuegang, Li Ning, Duan Liqin, Ren Chengzhe. Indications of amino acids for the degradation of organic matter and bacterial sources in sediments of the Jiaozhou Bay[J]. Haiyang Xuebao, 2018, 40(8): 29-41. doi: 10.3969/j.issn.0253-4193.2018.08.004

Citation:

Zhou Bu, Yuan Huamao, Song Jinming, Li Xuegang, Li Ning, Duan Liqin, Ren Chengzhe. Indications of amino acids for the degradation of organic matter and bacterial sources in sediments of the Jiaozhou Bay[J]. Haiyang Xuebao, 2018, 40(8): 29-41. doi: 10.3969/j.issn.0253-4193.2018.08.004

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Indications of amino acids for the degradation of organic matter and bacterial sources in sediments of the Jiaozhou Bay

doi: 10.3969/j.issn.0253-4193.2018.08.004

Key Laboratory of Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;University of Chinese Academy of Sciences, Beijing 100049, China;Function Laboratory of Marine Ecology and Environmental Sciences, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266071, China

Received Date: 2018-01-02
Rev Recd Date: 2018-03-03

Abstract

Abstract

The concentrations, compositions and distributions of total hydrolysable amino acids (THAAs) were investigated in the surface sediments from the Jiaozhou Bay. Combined with the TOC/TN ratios and stable carbon isotope (δ¹³C), carbon/nitrogen normalized yield of amino acids (THAA-C%, THAA-N%), degradation index (DI), reactivity index (RI) and D-AA% were used to indicate the origin and degradation states of organic matters in the Jiaozhou Bay sediments. Meanwhile, the contribution of bacterial to organic matters and extracellular enzyme activity (EEA) were also used to evaluate the roles of bacterial in the migration and conversion process of organic matters. The result showed that the average content of THAAs in surface sediments of the Jiaozhou Bay was (7.60±3.64) μmol/g. Under the influence of the combination of terrestrial and marine input, the concentrations of THAAs in inner bay were higher than those in outer bay, and THAAs in the eastern area of inner bay was higher than those in western areas, demonstrating the higher contribution of terrestrial input to THAAs in the eastern inner bay. According to THAA-C%, THAA-N%, DI, RI and mol% D-AA, the organic matters in sediments of inner bay were fresher than those in outer bay, and the organic matters in western inner bay area were fresher than those in the eastern area. The sources of organic matter, microbial activity and the depth of seawater column all had impacts on the degradation states of organic matter. The average bacterial contribution to organic carbon in the sediments of Jiaozhou Bay was (29.35±18.73)%, with the higher contribution in the western inner bay and outer bay. The average value of extracellular enzyme activity (EEA) of peptidase was (0.81±1.31) nmol/(g·h), and contrary to bacterial contribution to organic carbon, the EEA had the higher values in the eastern inner bay but had lower values in western inner bay and outer bay. The sources of sedimentary organic matter determined the reactivity of organic matter, and further affected the bacterial contribution to organic matter and EEA of peptidase.
- amino acids,
- degradation indicators,
- bacteria,
- sediments,
- Jiaozhou Bay

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