| 摘要: |
| 2003年6月—2004年5月对胶州湾及邻近海域水体中叶绿素α浓度变化及其空间分布进行了周年调查。结果表明,调查海域叶绿素α全年平均浓度为2.81 mg/m3,月平均浓度变化范围为0.73—8.44 mg/m3。整个海域叶绿素α浓度周年变化呈现双峰型,分别在夏季8月和冬季2月出现两个高峰,但是不同区域的变化幅度不同,其水平分布格局为湾内高于湾外,湾内北部高于南部。营养盐浓度变化与叶绿素α浓度的变动未发现明显的相关性,但是在局部海域硅酸盐对冬季浮游植物水华的进一步发展具有一定的限制作用。综合分析营养盐、叶绿素α和浮游动物的周年变化及其之间的关系显示,下行控制(Top-down control)在胶州湾浮游植物的数量变动中起着重要的调控作用。 |
| 关键词: 叶绿素α 浓度 分布 周年变化 胶州湾 |
| DOI： |
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| 基金项目:中国科学院野外台站网络基金项目(胶州湾);2005—2008中国科学院知识创新项目,KZCX3-SW-214号 |
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| CONCENTRATION,DISTRIBUTION AND ANNUAL FLUCTUATION OF CHLOROPHYLL-a IN THE JIAOZHOU BAY |
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LI Chao-Lun, ZHANG Fang, SHEN Xin, YANG Bo, SHEN Zhi-Liang, SUN Song
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Key Laboratory of Marine Ecology and Environmental Sciences,Institute of Oceanology,Chinese Academy of Sciences,Qingdao,266071
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| Abstract: |
| The Jiaozhou Bay is a typical temperate bay that provided with harbor, traveling, mariculture, etc. During the past decades, aquaculture, sea farming and changes in inputs of freshwater, nutrients and sediments have resulted in changes in structure and function of the marine ecosystem. In order to improve our understanding of the marine ecosystem of this area, the concentrations and distributions of Chlorophyll-α were investigated monthly during June 2003 to May 2004 in the Jiaozhou Bay and its adjacent area. The results showed that the annual average concentration of Chlorophyll-α was 2.81mg/m3 and the monthly mean concentrations ranged between 0.73 to 8.44 mg/m3 in the study area. The concentrations of Chlorophyll-α exhibited two-peak during the study period. Phytoplankton reached annual highest concentrations in February, and then decreasing gradually. From May, the concentrations of Chlorophyll-α increasing again with the water temperature increasing, and reached their second peak is in August, but the values were only half of those in February. The seasonal changes of Chlorophyll-α are larger in the northern shallow area than those in the southern and out of the bay. The highest value occurred in February (monthly average concentration was 15.52mg/m3) was nearly 30 times higher than that in December (0.55mg/m3) in the north of bay. The horizontal distribution patterns showed that the concentrations decreased from northern to southern in the Jiaozhou Bay, and higher inside than out of the bay. Comparing the Chlorophyll-α concentration with nitrate, ammonium, phosphate and silicate, there was no obvious correlation between them, although nutrient salts present a similar distribution pattern as that of Chlorophyll-α. Only the generally decline of the nutrients with phytoplankton increasing indicates that the phytoplankton growth has an important impact on the change of nutrients. The concentrations of silicates declined to nearly 0 when the phytoplankton blooming occurred in winter. On the other side, the following decline of phytoplankton biomass also suggested that the low silicate limited the further developing of the winter phytoplankton bloom. The fluctuation of zooplankton biomass is generally synchronous to that of phytoplankton in the study area, and the only exception is that zooplankton biomass still keep at a low level while phytoplankton increase in the northern area in summer. The culture of Ruditapes philippinarum increased dramatically in the Jiaozhou Bay during last decade. Although our survey area outside the shallow, dense culture area, the distribution of high concentrations of Chlorophyll-α shifted from northeast of the bay (mainly culture area of Ruditapes philippinarum) to the west area during this shellfish fast growth season, which indicated the influence of human activity on the nature ecosystems. Analysis on the variations of the nutrient salt, Chlorophyll-α, and zooplankton, top-down control mechanism play an important role on regulating the fluctuation. |
| Key words: Chlorophyll-α, Concentration, Distribution,Annual fluctuation,The Jiaozhou Bay |
