黄海、东海上层海水磷循环的同位素示踪研究

张远辉; 尹明端

黄海、东海上层海水磷循环的同位素示踪研究

国家海洋局海洋大气化学与全球变化重点实验室, 福建, 厦门, 361005;国家海洋局, 第三海洋研究所, 福建, 厦门, 361005

基金项目: 国家重点基础研究发展规划资助项目(G1999043704)

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出版历程
- 收稿日期: 2006-09-01
- 修回日期: 2006-12-11

Phosphorus cycling in the upper ocean of the East China Sea using natural ³²P and ³³P

Key Laboratory of Marine Atmospheric Chemistry and Global Change, Xiamen 361005, China;Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China

摘要

摘要: 采用超低本底液闪β计数的方法,测定了春季黄海、东海海水中溶解态、悬浮物、筛绢颗粒物和雨水中天然³²P和³³P的比活度.结果显示,上层海水各相33P,32P的比活度相当低,其中TDP的³²P,³³P比活度的浓度最高,悬浮物次之,筛绢颗粒物最低.海水各相中³³P与³²P活度比值从TDP到悬浮物、筛绢颗粒物逐渐增大,反映出食物链传递过程中磷的年龄逐渐增加.根据稳态模式的估算结果,海水各相中磷的停留时间具有明显的区域变化特征,其中近岸和内陆架溶解磷的停留时间比外陆架短,仅为3~4 d,意味着近岸和内陆架海区低浓度的磷也可能维持高生物生产力的运转.利用稳态模式还估算出浮游植物的碳同化通量为189~814 mg/(m²·d),浮游动物的碳摄食通量为10~161 mg/(m²·d).此外,通过比较雨水³²P,³³P的输入通量和海水³²P,³³P积存量,利用质量平衡方法估算出上层海水POC输出通量为102~972 mg/(m²·d).
- ³²P /
- ³³P /
- 停留时间 /
- 吸收速率 /
- 输出通量 /
- 东海 /
- 黄海
Abstract: Natural activities of 32P (t_1/2=14.3 d) and ³³P (t_1/2=25.3 d) in total dissolved P(TDP), suspended particulate matter, net-plankt on and rainwater during the spring of 2001 were measured by anultra-low level liquid scintillation counter.A continuous steady-state model was used to estimate residence times of various phosphorus pools, uptake rates of the biological food chain within the upper ocean of the East China Sea.³²P/³³Pratios increased from the dissolved pools to the suspended matter and to net-plankton, reflecting that the age Of Pincreased as one moved up through the food chain.The residence time of P in the dissolved pools of coastal water and mid-shelfarea were very short (3~4 d), which suggests thatlow phosphorus concentrations could support relatively high levels of primary production.A phytoplankton assimilating flux of 189~814 mg/(m²·d) and a zooplankt on grazing flux of 10~161 mg/(m²·d) were also estimated and show that grazing rates of carbon correspo nded to 3%~20% of primary production.In addition, the particulate organic carbon fluxes from the upper ocean were calculated by directly comparing the measured seawater inventory of ³²P and ³³P with that measured in rain, and were found to range between 102 and 972 mg/(m²·d).
- ³²P /
- ³³P /
- residence time /
- uptake rate /
- export flux /
- East China Sea /
- Huanghai Sea

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参考文献(30)

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