Spatiotemporal variation of dissolved carbohydrates and amino acids in Jiaozhou Bay,China  

作　　者：时迪 杨桂朋 孙岩 吴冠伟 

机构地区：[1]Key Laboratory of Marine Chemistry Theory and Technology,Ocean University of China,Ministry of Education/Qingdao Collaborative Innovation Center of Marine Science and Technology,Qingdao 266100,China [2]Laboratory of Marine Ecology and Environmental Science,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,China [3]Institute of Marine Chemistry,Ocean University of China,Qingdao 266100,China

出　　处：《Chinese Journal of Oceanology and Limnology》2017年第2期383-399,共17页中国海洋湖沼学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.41030858);the Changjiang Scholars Program,Ministry of Education of China;the Taishan Scholars Programme of Shandong Province

摘　　要：Surface seawater samples were collected from Jiaozhou Bay,China,during six cruises(MarchMay 2010,September-November 2010) to study the distribution of dissolved organic matter including dissolved organic carbon(DOC),total dissolved carbohydrates,namely monosaccharides(MCHO) and polysaccharides(PCHO) and total hydrolysable amino acids.These included dissolved free amino acids(DFAA) and combined amino acids(DCAA).The goal was to investigate possible relationships between these dissolved organic compounds and environmental parameters.During spring,the concentrations of MCHO and PCHO were 9.6(2.8-22.6) and 11.0(2.9-42.5) μmol C/L,respectively.In autumn,MCHO and PCHO were 9.1(2.6-27.0) and 10.8(2.4-25.6) μmol C/L,respectively.The spring concentrations of DFAA and DCAA were 1.7(1.1-4.1) and 7.6(1.1-31.0) μmol C/L,respectively,while in autumn,DFAA and DCAA were 2.3(1.1-8.0) and 3.3(0.6-7.2) μmol C/L,respectively.Among these compounds,the concentrations of PCHO were the highest,accounting for nearly a quarter of the DOC,followed by MCHO,DCAA and DFAA.The concentrations of the organic compounds exhibited a decreasing trend from the coastal to the central regions of the bay.A negative correlation between concentrations of DOC and salinity in each cruise suggested that riverine inputs around the bay have an important impact on the distribution of DOC in the surface water.A significant positive correlation was found between DOC and total bacteria count in spring and autumn,suggesting bacteria play an important role in the marine carbon cycle.Surface seawater samples were collected from Jiaozhou Bay, China, during six cruises （March- May 2010, September-November 2010） to study the distribution of dissolved organic matter including dissolved organic carbon （DOC）, total dissolved carbohydrates, namely monosaccharides （MCHO） and polysaccharides （PCHO） and total hydrolysable amino acids. These included dissolved free amino acids （DFAA） and combined amino acids （DCAA）. The goal was to investigate possible relationships between these dissolved organic compounds and environmental parameters. During spring, the concentrations of MCHO and PCHO were 9.6 （2.8-22.6） and 11.0 （2.9-42.5） μmol C/L, respectively. In autumn, MCHO and PCHO were 9.1 （2.6-27.0） and 10.8 （2.4-25.6） μmol C/L, respectively. The spring concentrations of DFAA and DCAA were 1.7 （1.1-4.1） and 7.6 （1.1-31.0） μmol C/L, respectively, while in autumn, DFAA and DCAA were 2.3 （1.1-8.0） and 3.3 （0.6-7.2） μmol C/L, respectively. Among these compounds, the concentrations of PCHO were the highest, accounting for nearly a quarter of the DOC, followed by MCHO, DCAA and DFAA. The concentrations of the organic compounds exhibited a decreasing trend from the coastal to the central regions of the bay. A negative correlation between concentrations of DOC and salinity in each cruise suggested that riverine inputs around the bay have an important impact on the distribution of DOC in the surface water. A significant positive correlation was found between DOC and total bacteria count in spring and autumn, suggesting bacteria play an important role in the marine carbon cycle.

关 键 词：carbohydrates amino acids CONCENTRATION seasonal variation biological parameter Jiaozhou Bay 

分 类 号：P734[天文地球—海洋化学]