铁山港湾是广西沿海受径流影响较小的海湾，也是“南珠”养殖的重要基地之一。本文通过 1983—1984 年和 1996—1997 年丰、枯水期对该湾的调查研究资料，在对该湾主要环境参数进行分析、讨论的基础上，运用营养状态指数法和水质指数法...铁山港湾是广西沿海受径流影响较小的海湾，也是“南珠”养殖的重要基地之一。本文通过 1983—1984 年和 1996—1997 年丰、枯水期对该湾的调查研究资料，在对该湾主要环境参数进行分析、讨论的基础上，运用营养状态指数法和水质指数法对该湾 15 a 间的水质状况进行评价。结果表明：该湾 15 a 间盐度呈相对稳定状态，pH、DO 和 COD 变化不大，营养盐中 N 呈上升趋势，P 则相反，Si 随枯、丰水期变化而呈升、降趋势；但营养盐结构变化较大，显著 N 限制状况已转变为接近适宜，而 P 和 Si 则从供给充足向相对不足方向演化；水域营养状况属贫营养型，水质状况正在向良好状态发展。展开更多
To better understand the spatial-temporal variation in phytoplankton community structure and its controlling factors in Jiaozhou Bay, Qingdao, North China, four seasonal sampling were carried out in 2017. The phytopla...To better understand the spatial-temporal variation in phytoplankton community structure and its controlling factors in Jiaozhou Bay, Qingdao, North China, four seasonal sampling were carried out in 2017. The phytoplankton community structure and various environmental parameters were examined. The phytoplankton community in the bay was composed of mainly diatoms and dinofl agellates, and several other species of Chrysophyta were also observed. Diatoms were the most dominant phytoplankton group throughout the year, except in spring and winter, when Noctiluca scintillans was co-dominant. High Si/N ratios in summer and fall refl ect the high dominance of diatoms in the two seasons. Temporally, the phytoplankton cell abundance peaked in summer, due mainly to the high temperatures and nutrient concentrations in summer. Spatially, the phytoplankton cell abundance was higher in the northern part of the bay than in the other parts of the bay in four seasons. The diatom cell abundances show signifi cant positive correlations with the nutrient concentrations, while the dinofl agellate cell abundances show no correlation or a negative correlation with the nutrient concentrations but a signifi cant positive correlation with the stratifi cation index. This discrepancy was mainly due to the diff erent survival strategies between diatoms and dinofl agellates. The Shannon-Wiener diversity index ( H′) values in the bay ranged from 0.08 to 4.18, which fell in the range reported in historical studies. The distribution pattern of H′ values was quite diff erent from that of chlorophyll a , indicating that the phytoplankton community structure might have high biomass with a low diversity index. Compared with historical studies, we believe that the dominant phytoplankton species have been changed in recent years due mainly to the changing environment in the Jiaozhou Bay in recent 30 years.展开更多
文摘铁山港湾是广西沿海受径流影响较小的海湾，也是“南珠”养殖的重要基地之一。本文通过 1983—1984 年和 1996—1997 年丰、枯水期对该湾的调查研究资料，在对该湾主要环境参数进行分析、讨论的基础上，运用营养状态指数法和水质指数法对该湾 15 a 间的水质状况进行评价。结果表明：该湾 15 a 间盐度呈相对稳定状态，pH、DO 和 COD 变化不大，营养盐中 N 呈上升趋势，P 则相反，Si 随枯、丰水期变化而呈升、降趋势；但营养盐结构变化较大，显著 N 限制状况已转变为接近适宜，而 P 和 Si 则从供给充足向相对不足方向演化；水域营养状况属贫营养型，水质状况正在向良好状态发展。
基金Supported by the National Natural Science Foundation of China(Nos.31700425,91751202)the Innovation Plan of Science and Technology for Aoshan(No.2016ASKJ02)the Health Assessment and Decision Support System for Coastal Ecosystem(No.XDA19060204)
文摘To better understand the spatial-temporal variation in phytoplankton community structure and its controlling factors in Jiaozhou Bay, Qingdao, North China, four seasonal sampling were carried out in 2017. The phytoplankton community structure and various environmental parameters were examined. The phytoplankton community in the bay was composed of mainly diatoms and dinofl agellates, and several other species of Chrysophyta were also observed. Diatoms were the most dominant phytoplankton group throughout the year, except in spring and winter, when Noctiluca scintillans was co-dominant. High Si/N ratios in summer and fall refl ect the high dominance of diatoms in the two seasons. Temporally, the phytoplankton cell abundance peaked in summer, due mainly to the high temperatures and nutrient concentrations in summer. Spatially, the phytoplankton cell abundance was higher in the northern part of the bay than in the other parts of the bay in four seasons. The diatom cell abundances show signifi cant positive correlations with the nutrient concentrations, while the dinofl agellate cell abundances show no correlation or a negative correlation with the nutrient concentrations but a signifi cant positive correlation with the stratifi cation index. This discrepancy was mainly due to the diff erent survival strategies between diatoms and dinofl agellates. The Shannon-Wiener diversity index ( H′) values in the bay ranged from 0.08 to 4.18, which fell in the range reported in historical studies. The distribution pattern of H′ values was quite diff erent from that of chlorophyll a , indicating that the phytoplankton community structure might have high biomass with a low diversity index. Compared with historical studies, we believe that the dominant phytoplankton species have been changed in recent years due mainly to the changing environment in the Jiaozhou Bay in recent 30 years.
