Distribution of Dissolved Free Amino Acids and Its Relationships with Environment Factors in Winter in Beibu Gulf

对北部湾海域冬季水体溶解游离氨基酸(DFAA)的分布特征及其影响因素进行了分析.结果表明:(1)冬季北部湾海域DFAA含量各层的平面分布较为均匀,在0.17～1.73μmol/L之间,263个样品DFAA浓度平均值为0.36±0.13μmol/L;(2)DFAA含量的垂直分布规律较为明显,随深度增加而增加;(3)DFAA与海水中的3种无机氮盐(NO3-N,NO2-N及NH4-N)呈正相关.与表层和底层溶解氧(DO)浓度不相关;(4)沿岸区DFAA浓度受外界影响较为明显(尤其在昌化江入海处),海区的游离氨基酸浓度与该海域典型渔场有明显的相关性,生物效应可能是影响该海域DFAA含量的主要因素.Distribution of dissolved free amino acids(DFAA) and its relationships with some environmental factors in winter waters of Beibu Gulf were studied.The results showed that the concentration range of DFAA was 0.17～1.73 μmol/L and the average concentration of DFAA for 263 samples was 0.36±0.13 μmol/L.The vertical distributions of DFAA concentrations showed a slight increase with the increase of depth.The concentrations of DFAA were moderately correlated with the dissolved inorganic nitrogen(including NO3-N﹑NO2-N and NH4N),but there was no correlation with concentrations of DO in bottom and surface waters.The DFAA in coastal zone were apparently influenced by terrestrial inputs,especially Changhua River estuary.The correlation between free amino acids in the whole areas and the typical sea fisheries was significant,suggesting biological effects maybe the main factors controlling the distribution of DFAA in this area.我国近海海洋综合调查与评价(908专项)资

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