| 摘要: |
| 根据2003年5月—2004年4月逐月对胶州湾初级生产力的调查研究,分析讨论了胶州湾初级生产力的周年动态变化特征。结果表明,胶州湾初级生产力存在着明显的季节变化:夏季是一年中的高峰,平均为835.72mgC/(m2*d),春、秋季次之,分别为286.00mgC/(m2*d)和247.81mgC/(m2*d),冬季最低,平均为102.27mgC/(m2*d)。初级生产力平面分布特征为:夏季高值区一般位于湾西北部和东北部近岸水域,秋季至次年春末的高值区一般位于湾东北部近岸水域,湾中部和湾口海域较低。湾外海域除夏末秋初与湾中部水平接近外,其它季节比湾中部和湾口低,呈自湾内向湾外递降的分布趋势。6月下旬记录到7213.48mgC/(m2*d)初级生产力的最高值,位于湾东侧近岸,该高值持续时间很短,在时间上恰巧对应于一周前的一次强降雨过程。温度是影响胶州湾初级生产力季节变化的决定因子。 |
| 关键词: 胶州湾 初级生产力 周年变化 浮游植物 |
| DOI： |
| 分类号: |
| 基金项目:中国科学院知识创新项目重点方向性项目,KZCX3-SW-214号;青岛市科技局项目,04-3HH-42号;中国科学院野外网络基金项目(胶州湾),2005—2008 |
附件 |
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| ANNUAL VARIATION OF PRIMARY PRODUCTIVITY IN JIAOZHOU BAY |
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SUN Song, ZHANG Yong-Shan, WU Yu-Lin, ZHANG Guang-Tao, ZHANG Fang, PU Xin-Ming
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Key Laboratory of Marine Ecology and Environmental Sciences,Chinese Academy of SciencesInstitute of Oceanology,Chinese Academy of Sciences,Qingdao,266071
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| Abstract: |
| Jiaozhou Bay is located in the west side of the Yellow Sea, a middle size(374km2) semi-closed bay, the average depth is 7m. Jiaozhou Bay ecosystem has been affected by the rapid economic development and population growth, the frequent industry activities and large-scale marine aquaculture in the bay. In geographic characteristics and aquaculture activity, Jiaozhou Bay can be divided into three parts: the inner part that is a shallow water area with widespread benthic shellfish farming; deep water mouth area having similar to the Yellow Sea in ocean ecosystem feature; and middle mixture area that is affected by both in-bay aquaculture and marine current system.
From May 2003 to April 2004, the primary productivity (PP) of the bay was measured monthly at 22 stations in 12 cruises, and 4 stat ions were selected and measured every 10 days. The annual mean net 14C-PP in the bay was 367.95mgC/(m2*d). Seasonal change was evident, for the highest PP of 835.72mgC/(m2*d) in summer, and the lowest in winter at 102.27mgC/(m2*d); in spring and autumn, 286.00mgC/(m2*d) and 247.81mgC/( m2*d) were observed respectively.
According to the every-ten-day measurements, an abnormal peak was recorded in late June of 2003, with extra high value of 7213.48mgC/(m2*d), and the peak disappeared rapidly in early July, which was induced by a heavy rainfall.
Geographically, PP was the highest in the north of Jiaozhou Bay, and decreased outwards to the mouth area. In summer, PP was higher in near shore areas in the north of the bay, while from November to the next June it was higher only in the northeast area. PP outside of the bay was always lower than that in the central and north parts of the bay except for October.
There were two peaks in biomass of the net sampled phytoplankton and the Chlorophyll-α, one occurred in the summer, another one in the winter. However, only one summer PP peak was observed, because the feeding activities of zooplankton and more important, the large scale of shellfish farming. For example, that the annual production of Ruditapes philippinarum could reach more than 300000 tons. |
| Key words: Jiaozhou Bay, Primary product ivity, Annual variation, Phytoplankton |
