2008年夏季白令海营养盐的分布及其结构状况

高生泉; 陈建芳; 李宏亮; 刘子琳; 卢勇; 张海生

2008年夏季白令海营养盐的分布及其结构状况

国家海洋局海洋生态系统与生物地球化学,浙江杭州 310012;国家海洋局第二海洋研究所,浙江杭州 310012

基金项目: 国家自然科学基金(40876103;41076135;41003036);国家海洋局第二海洋研究所基本科研业务费专项(JG200820);中国第三次北极科学考察资助项目。

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- 收稿日期: 2010-08-06

The distribution and structural conditions of nutrients in the Bering Sea in the summer of 2008

Key Laboratory of State Oceanic Administration for Marine Ecological System and Biogeochemistry, Hangzhou 310012, China;Second Institute of Oceanograrhy, State Oceanic Administration, Hangzhou 310012, China

摘要

摘要: 中国第3次北极考察对白令海营养盐的分布及结构状况进行了观测分析,结果表明,白令海营养盐分布和结构状况区域性特征明显。海盆区表层DIN、磷酸盐和硅酸盐平均浓度分别为9.73,0.94,11.06 μmol/dm³;陆架区表层DIN,磷酸盐和硅酸盐平均浓度分别为0.60, 0.43, 3.74 μmol/dm³。营养盐高值主要出现在白令海西南部的海盆区和海峡口西南侧水域,低值出现于陆架边缘的陆坡区和陆架东部水域。白令海盆区真光层DIN,磷酸盐、硅酸盐浓度普遍较高,叶绿素浓度则较低,具有典型的高营养盐、低叶绿素(HNLC)特征。海盆区生物作用不是营养盐空间分布的主要调控因子,而陆架区营养盐的分布变化不仅受控于物理海洋输运过程的变化,同时也受夏季浮游生物生长、营养盐吸收消耗所影响。陆架和陆坡区表层海水N/P,Si/P比值平均分别为1.8, 9.9和3.2, 2.2,呈明显的低N/P,Si/P比值结构特征,陆坡区缺硅明显,陆架区缺氮显著。在白令海水域磷酸盐浓度普遍较高,它不可能成为浮游植物光合作用限制因子。受硅限制水域主要限于陆坡区硅藻大量繁殖时期,属偶然性限制,在白令海陆架区绝大部分水域主要表现为氮限制。
- 营养盐 /
- 营养盐结构 /
- 分布特征 /
- 白令海
Abstract: Distribution features and structural conditions of nutrients in the Bering Sea were observed during the third arctic research expedition of China in the summer of 2008. The results showed that the distribution and structural condition of nutrients in the Bering Sea were obviously areal characteristics. The surface average concentrations (9.73, 0.94, 11.06 μmol/dm³ respectively) of DIN, phosphate and silicate in the Bering Basin were much higher than those (0.60, 0.43, 3.74 μmol/dm³ respectively) in the continental shelf waters. The high surface concentrations of nutrients appeared mainly in the southern area of the Bering Basin and the low values occurred on the slope break and in the eastern waters of the continental shelf. The concentrations of DIN, phosphate and silicate were generally high, while chlorophyll a concentrations were low in the euphotic zone of the Bering Basin, showing typically characteristics of high-nutrients, low-chlorophyll a (HNLC). The results suggested that the biological process were not the main controlling factor for nutrient distributions in the Bering Basin, while the distributions and variations of nutrients in the continental shelf waters were not only controlled by the transport of physical process, but also affected by phytoplankton productivity and consumption of nutrient during summer. The surface average ratios of N/P, Si/P on the slope break and in continental shelf waters were 1.8, 9.9 and 3.2, 2.2 respectively. DIN-deficiency in the continental shelf waters and Si-deficiency on the slope break were apparently characteristics in summer. The concentration of phosphate was generally high and it was not possible to be a limiting-factor for the phytoplankton growth in the Bering Sea. N was limiting factor for the phytoplankton productivity in the most of continental shelf waters due to deficiency of DIN and low ratios of N/P in the surface waters, whereas Si-limitation was sporadic, only on the slope break during growth of diatom.
- nutrient /
- distribution features /
- nutrient condition /
- Bering Sea

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