| 摘要: |
| 2017年4月作者对海州湾临洪河口海域16个站位的常规理化因子以及浮游植物粒级结构进行了采样和分析，结果表明：调查海域盐度和温度均值分别为35.2和11.2℃，均由近岸到外海逐渐增大；悬浮物质量浓度在3.4 mg/L~137.6 mg/L变化，均值为22.8 mg/L，由近岸到外海逐渐减少，水体逐渐清澈；pH均值为8.29，近岸低，外海高；DO均值为9.8 mg/L，COD在0.34 mg/L~6.55 mg/L变化，均值为3.42 mg/L，DO和COD分布规律不明显；浮游植物粒级组成以微型与小型浮游植物为主，其叶绿素a质量浓度平均值与范围分别为1.48 μg/L （0.68 μg/L~3.13 μg/L）、9.14 μg/L （2.69 μg/L~25.50 μg/L），且呈现自沿岸河口向外海逐渐递减的趋势；而微微型浮游植物叶绿素a质量浓度平均值仅为0.27 μg/L，且分布较不规律；小型浮游植物对浮游植物总生物量的贡献率最大，高达83.89%，微型及微微型浮游植物的贡献率分别为13.60%和2.52%；在相关性分析中，各项环境因子对小型浮游植物的分布有较大的影响，其中悬浮物、pH与小型浮游植物叶绿素a浓度表现出显著相关（P<0.05），溶解氧、盐度与小型浮游植物叶绿素a质量浓度呈极显著相关（P<0.01），微型、微微型浮游植物的分布与各项环境因子的相关性不明显。 |
| 关键词: 浮游植物 粒级结构 叶绿素a 临洪河口 |
| DOI：10.11759/hykx20190528003 |
| 分类号:P735 |
| 基金项目:江苏省高等学校自然科学研究面上项目（15KJB170001）；2019年华东师范大学优秀博士生学术创新能力提升计划项目（YBNLTS2019-007） |
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| Phytoplankton size structure and environmental factors in the Linhong estuary of Haizhou Bay |
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FANG Tao1, LIU Kai2, FENG Zhi-hua1, LI You1
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1.School of Marine Resource and Environment, Jiangsu Ocean University, Lianyungang 222005, China;2.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
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| Abstract: |
| A total of 16 stations were sampled to analyze environmental factors and phytoplankton size structure in the Linhong estuary of Haizhou Bay in April 2017. The results showed that mean salinity and mean temperature in the studied sea area were 35.2 and 11.2℃, respectively, which gradually increased from nearshore to offshore. The concentration of suspended sediments varied from 3.4 to 137.6 mg/L (average value, 22.8 mg/L) and decreased from nearshore to offshore, causing the water to become clear. The average pH value was 8.29, with low and high values at nearshore and offshore, respectively. The mean value of DO was 9.8 mg/L; COD varied from 0.34 mg/L to 6.55 mg/L (mean value, 3.42 mg/L), with no obvious pattern in its distribution. The microflora mainly comprised nanophytoplankton and microphytoplankton with average chlorophyll a concentrations of 1.48 ug/L (range, 0.68 ug/L-3.13 ug/L) and 9.14 ug/L (range, 2.69 ug/L-25.50 ug/L), respectively. The chlorophyll a concentrations of both nanophytoplankton and picophytoplankton decreased from nearshore to offshore. The average chlorophyll a concentration of picophytoplankton was only 0.27 ug/L, with an irregular distribution. The contribution rate of microphytoplankton to the total phytoplankton biomass was the largest (up to 83.89%), and the contribution rates of nanophytoplankton and picophytoplankton were 13.60% and 2.52%, respectively. In correlation analysis, the distribution of microphytoplankton was considerably affected by environmental factors. Suspended sediments, pH, and chlorophyll a concentration of microphytoplankton were significantly correlated (P<0.05). Dissolved oxygen and salinity were significantly correlated with chlorophyll a concentration of microphytoplankton (P<0.01); however, the distributions of nanophytoplankton and picophytoplankton were not significantly correlated with various environmental factors. |
| Key words: Phytoplankton size structure chlorophyll a Linhong estuary |
