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首页 > 中国极地考察知识库 > 成果信息库 > 已审查 北冰洋中心区表层海水营养盐水平及浮游植物群落对快速融冰的响应

北冰洋中心区表层海水营养盐水平及浮游植物群落对快速融冰的响应

【标题】北冰洋中心区表层海水营养盐水平及浮游植物群落对快速融冰的响应

【Title】Nutrient status and phytoplankton-pigments response to ice melting in the Arctic Ocean

【DOI】10.3724 /SP.J.1084.2012.00151

【作者】 庄燕培; 金海燕; 陈建芳; 王斌; 李宏亮; 陈法锦; 卢勇; 徐杰

【Author】 Zhuang Yanpei ; Jin Haiyan ; Chen Jianfang ; Wang Bin ; Li Hongliang ; Chen Fajin ; Lu Yong ; Xu Jie

【期刊】极地研究

【Journal】

【期刊年份】2012

【卷】24

【期】2

【关键词】 海冰融化; 光合色素; 北极

【Keywords】 ice melting; photosynthetic pigments; Arctic

【摘要】 本文依托2010夏季中国第四次北极科学考察,通过对高纬度极地冰下水和冰芯的营养盐的连续观测及表层水颗粒物的藻类色素分析,获取了夏季快速融冰下冰水界面营养盐和光合色素的分布信息。结果表明调查期间表层水磷酸盐和硅酸盐相对于无机氮更丰富(依据Redfield比值),表现为显著的氮限制。而冰芯无机氮浓度相对更高,融冰释放对水体无机氮有一定的补充。色素分析显示岩藻黄素(Fuco)和叶绿素a(Chl a)是水体颗粒物的主要光合色素。在8/15至8/18期间,叶绿素c(Chl c)、硅藻黄素(Diato)、硅甲藻黄素(Diadino)和岩藻黄素(Fuco)分别达到6,22,73和922μg/m3,体现了硅藻在群落中的优势地位。岩藻黄素(Fuco)的浓度在融冰快速期间有巨大的提升,主要来源于冰芯底部释放的衰老的冰生硅藻和浮游硅藻的生长。此外,青绿黄素(Prasino)和叶黄素(Lut)与岩藻黄素(Fuco)分布模式有明显的差异,暗示青绿藻和绿藻与硅藻对海冰融化的不同响应。

【Abstract】During the 4th Chinese National Arctic Expedition cruise in summer 2010, in a high Arctic, a time-series observation was carried out in order to examine the response of nutrients and phytoplankton in the ice-ocean interface to the ice melting. Phosphate and silicate in the ice-ocean interface were rich relative to nitrogen, based on Redfield ratio (16N:1P:16Si), suggesting that nitrogen was the potential limiting nutrient. Nitrogen concentration in the sea ice was about 3-4 times that in the surface seawater, indicating that melting water delivered nitrogen to the surface water. Pigments analysis showed that fucoxanthin and chlorophyll a were the main contributor of carotenoids and chlorophylls in particles, respectively. The mean concentrations of chlorophyll c, diatoxanthin, diadinoxanthin and fucoxanthin during 15 to 18 August were 6, 22, 73 and 922 μg/m3, respectively, suggesting that diatoms dominated in the phytoplankton community composition. Furthermore, a notable enhancement in fucoxanthin and chlorophyll a during a large-scale melting was likely attributed to senescent diatoms released from the bottom sea-ice as well as phytoplankton diatoms growth in the water column due to the input of nutrients (i.e. nitrogen) from melting water. Temporal distribution pattern of diagnostic pigments prasinoxanthin and lutein differed from fucoxanthin, indicating that green algae and diatoms responded differently to ice melting.

【基金/项目】 国家海洋局第二海洋研究所基本科研业务费专项资助 ; 海洋公益性行业科研专项 ; 北冰洋“生物泵”组成结构及其对海冰变化的响应 ; 沉积氮同位素指示北冰洋古硝酸盐利用程度可靠性研究 ; 极地生态环境监测规范的研究与制订

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