| 摘要: |
| 2017年4月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；悬浮物浓度在3.4-137.6mg/L变化,均值为22.8mg/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9.8mg/L,COD在0.34-6.55mg/L变化,均值为3.42mg/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浓度平均值与范围分别为1.48 μg/L(0.68-3.13 μg/L)、9.14 μg/L(2.69-25.50 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： |
| 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 Linhong Estuary of Haizhou Bay |
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FANG Tao,LIU Kai,FENG Zhihua,LI You
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1.School of Marine Resource and Environment,Huaihai Institute of Technology;2.State Key Laboratory of Estuarine and Coastal Research,East China Normal University
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| Abstract: |
| A total of 17 stations were sampled to analyze environmental factors and phytoplankton size structure in Linhong Estuary of Haizhou Bay In April 2017. The results showed that the mean of salinity and temperature in studying sea area were 35.2 and 11.2℃, respectively, and gradually increased from neaeshore to offshore; the concentration of suspended sediments varied from 3.4 to 137.6 mg/L, with an average value of 22.8 mg/L, and decreased from nearshore to offshore, causing the water to become clear; the average value of pH was 8.29, with low nearshore and high offshore；the mean value of DO was 9.8 mg/L, COD varied from 0.34 to 6.55 mg/L, and the mean value was 3.42 mg/L, and their distribution were not obvious；phytoplankton was mainly composed of nanophytoplankton and microphytoplankton, and the average and range of chlorophyll a concentration were 1.48 ug/L (0.68-3.13 ug/L), 9.14 ug/L (2.69-25.50 ug/L), respectively, and chlorophyll a of nanophytoplankton and picophytoplankton both decreased from nearshore to offshore; the average chlorophyll a concentration of picophytoplankton was only 0.27 ug/L, and its distribution was irregular; the contribution rate of microphytoplankton to total phytoplankton biomass was the largest, up to 83.89%, and that of nanophytoplankton and picophytoplankton was 13.60% and 2.52%, respectively; in correlation analysis, the distribution of microphytoplankton was greatly affected by environmental factors; suspended sediments, pH and chlorophyll a concentration of microphytoplankton were significantly correlated (P < 0.05), and dissolved oxygen and salinity were very significantly correlated with chlorophyll a concentration of microphytoplankton (P < 0.01), while the distribution of nano and picophytoplankton was not significantly correlated with various environmental factors. |
| Key words: Phytoplankton Size structure Chlorophyll a Linhong Estuary |