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研究了瓦氏马尾藻(Sargassum vachellianum)海区规模化养殖及其对水环境因子的影响。结果表明:瓦氏马尾藻生长适宜水深为1.5~2.5 m,最适水深为2 m;藻体春秋季节生长相对较快,夏季开始衰败,2014年5月养殖和野生藻体均达到最高日特定生长率,分别达6.8%·d-1和5.9%·d-1,且养殖藻体生长及成熟均快于野生藻体;与2013年相比,2014年除1、7号站位外其他站位无机氮(IN)、无机磷(IP)、总氮(TN)、总磷(TP)、化学需氧量(COD)和叶绿素a(Chl-a)质量浓度均显著降低(P<0.05),整体呈两侧站位高、中部站位低的趋势;溶解氧(DO)质量浓度和透明度(SD)显著升高(P<0.05),其中COD和Chl-a质量浓度分别降低18.75%和43.51%,且后者最高值仅为1.55μg·L-1;DO质量浓度和透明度(SD)分别升高了4.52%和8.09%;瓦氏马尾藻养殖后该海域水质明显改善。该研究结果为瓦氏马尾藻栽培及利用大型海藻进行海洋水质环境修复提供理论依据。
The scale culture of Sargassum vachellianum and its effect on water environmental factors were studied. The results showed that the optimal water depth for Sargassum growth was 1.5-2.5 m and the optimum water depth was 2 m. The growth of algal blooms in spring and autumn was relatively fast and began to decay in summer. The highest date was reached in May 2014 The growth rate was 6.8% · d-1 and 5.9% · d-1, respectively, and the growth and maturation of cultured algae were faster than that of wild algae. Compared with 2013, The contents of inorganic nitrogen (IN), inorganic phosphorus (IP), total nitrogen (TN), total phosphorus (TP), chemical oxygen demand (COD) and chlorophyll a (Chl-a) ) Showed a trend of high standing stations on both sides and low central stations. The concentrations of DO and SD significantly increased (P <0.05), and the concentrations of COD and Chl-a decreased by 18.75% And 43.51% respectively, and the highest value of the latter was only 1.55 μg · L-1. The DO concentration and transparency increased by 4.52% and 8.09%, respectively. The results provided the theoretical basis for the cultivation of Sargassum gibelio and the use of large seaweeds for the repair of marine water environment.