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为了查明海藻场和贻贝养殖场中均以γ变形菌为优势种的异养浮游细菌发挥不同生态作用的环境条件是否相同,以2009年5月底栖海藻和养殖贻贝快速生长期的实验数据为基础,研究枸杞岛海域表层水体异养浮游细菌与生态环境因子之间的关系。结果显示:春季异养浮游细菌在海藻场海域、贻贝养殖区海域和过渡海域丰度均值分别为1.60×108个/L、1.21×108个/L和1.56×108个/L,水平分布为海藻场高于过渡区域高于贻贝养殖场,且藻场中细菌数量约为贻贝场中的1.33倍。海藻场中异养浮游细菌与叶绿素显著正相关,与铵盐也呈现一定的相关性,这主要归因于大型海藻主要利用硝酸盐而浮游植物与细菌共同竞争铵盐,导致铵盐浓度降低,铵盐成为影响异养浮游细菌生长的限制因子;过渡海域异养浮游细菌和铵盐显著负相关,与溶解有机碳呈正相关;贻贝养殖区中细菌与生态环境因子的关系不明显。因此,叶绿素、铵盐、溶解有机碳是枸杞岛海域春季藻场内外海域制约异养浮游细菌现存量的重要控制因子。研究亮点:本文以异养浮游细菌优势种均为γ变形菌的天然海藻区和人工贻贝养殖场为研究区域,首次在不同生境海域开展异养浮游细菌生态作用的调查,试图理清不同生态群落的存在对异养浮游细菌发挥生态作用的影响机制,为近岸典型生境中微食物环的构建提供依据。
In order to find out whether the different environmental conditions of heterotrophic planktonic bacteria, which are dominant species in the seaweed farm and mussel farm, play different ecological roles, Based on the data, the relationship between the heterotrophic planktonic bacteria and eco-environmental factors in surface waters of wolfberry Island was studied. The results showed that the average abundance of heterotrophic planktonic bacteria in seaweed farm, mussel farmland and transitional sea area in spring were 1.60 × 108 / L, 1.21 × 108 / L and 1.56 × 108 / L, respectively. The horizontal distribution was The seaweed field is higher than the transitional area and higher than the mussel farm, and the amount of bacteria in the algal farm is about 1.33 times of that in the mussel farm. The heterotrophic planktonic bacteria in seaweed farm had a significant positive correlation with chlorophyll and a certain correlation with ammonium, which was mainly attributed to the use of nitrate and phytoplankton to compete with bacteria in large-scale algae, resulting in the decrease of ammonium concentration, Ammonium salt was the limiting factor affecting the growth of heterotrophic planktonic bacteria. The heterotrophic plankton in transitional sea area was negatively correlated with ammonium and positively correlated with dissolved organic carbon. The relationship between bacteria and eco-environmental factors was not obvious in mussel culture area. Therefore, chlorophyll, ammonium and dissolved organic carbon are the important controlling factors for restricting the existing stock of heterotrophic planktonic bacteria in the sea area inside and outside the spring algae in wuqi Island. Research highlights: In this paper, heterotrophic planktonic bacteria are the dominant species are Proteus, the natural seaweed and artificial mussel farms as the study area, for the first time in different habitats to carry out heterotrophic planktonic bacteria ecological role in the investigation, trying to sort out different ecosystems The mechanism of the existence of community on the ecological role of heterotrophic planktonic bacteria provides the basis for the construction of micro-food rings in the typical habitats of nearshore.