| 热带北太平洋西部固氮速率及固氮微生物组成 |
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| 引用本文： | 张润,张东声,陈敏,江志兵,王春生,郑敏芳,邱雨生,黄杰.热带北太平洋西部固氮速率及固氮微生物组成[J].海洋学报(英文版),2019,38(12):26-34. |
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| 作者姓名： | 张润 张东声 陈敏 江志兵 王春生 郑敏芳 邱雨生 黄杰 |
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| 作者单位： | 厦门大学海洋与地球学院, 厦门大学, 厦门 361005,国家海洋局海洋生态系统与生物地球化学重点实验室, 自然资源部第二海洋研究所, 杭州 310012,厦门大学海洋与地球学院, 厦门大学, 厦门 361005,国家海洋局海洋生态系统与生物地球化学重点实验室, 自然资源部第二海洋研究所, 杭州 310012,国家海洋局海洋生态系统与生物地球化学重点实验室, 自然资源部第二海洋研究所, 杭州 310012,厦门大学海洋与地球学院, 厦门大学, 厦门 361005,厦门大学海洋与地球学院, 厦门大学, 厦门 361005,地球系统数值模拟教育部重点实验室 清华大学地球系统科学系, 清华大学, 北京 100084 |
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| 基金项目： | The National Basic Research Program of China under contract No. 2015CB452903; the Foundation of China Ocean Mineral Resources R&D Association under contract No. DY135-E2-2-03; the Science and Technology Basic Resources Investigation Program of China under contract No. 2017FY201403; the National Natural Science Foundation of China under contract Nos 41676174, 41206104 and 41876198. |
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| 摘 要： | In the present study, we report N_2 fixation rate(~(15)N isotope tracer assay) and the diazotroph community structure(using the molecular method) in the western tropical North Pacific Ocean(WTNP)(13°–20°N, 120°–160°E). Our independent evidence on the basis of both in situ N_2 fixation activity and diazotroph community structure showed the dominance of unicellular N_2 fixation over majority of the WTNP surface waters during the sampling periods.Moreover, a shift in the diazotrophic composition from unicellular cyanobacteria group B-dominated to Trichodesmium spp.-dominated toward the western boundary current(Kuroshio) was also observed in 2013. We hypothesize that nutrient availability may have played a major role in regulating the biogeography of N_2 fixation.In surface waters, volumetric N_2 fixation rate(calculated by nitrogen) ranged between 0.6 and 2.6 nmol/(L·d) and averaged(1.2±0.5) nmol/(L·d), with 10 μm size fraction contributed predominantly(88%±6%) to the total rate between 135°E and 160°E. Depth-integrated N_2 fixation rate over the upper 200 m ranged between 150 μmol/(m~2·d)and 480 μmol/(m~2·d)(average(225±105) μmol/(m~2·d). N_2 fixation can account for 6.2%±3.7% of the depthintegrated primary production, suggesting that N_2 fixation is a significant N source sustaining new and export production in the WTNP. The role of N_2 fixation in biogeochemical cycling in this climate change-vulnerable region calls for further investigations.
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| 关 键 词： | 热带北太平洋西部 固氮作用 15N同位素示踪法 单细胞固氮生物 |
| 收稿时间： | 2018/12/28 0:00:00 |
N2 fixation rate and diazotroph community structure in the western tropical North Pacific Ocean |
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| Zhang Run,Zhang Dongsheng,Chen Min,Jiang Zhibing,Wang Chunsheng,Zheng Minfang,Qiu Yusheng and Huang Jie.N2 fixation rate and diazotroph community structure in the western tropical North Pacific Ocean[J].Acta Oceanologica Sinica,2019,38(12):26-34. |
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| Authors: | Zhang Run Zhang Dongsheng Chen Min Jiang Zhibing Wang Chunsheng Zheng Minfang Qiu Yusheng and Huang Jie |
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| Institution: | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China;Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration/Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China;Ministry of Education Key Laboratory for Earth System Modeling/Department of Earth System Science, Tsinghua University, Beijing 100084, China |
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| Abstract: | In the present study, we report N2 fixation rate (15N isotope tracer assay) and the diazotroph community structure (using the molecular method) in the western tropical North Pacific Ocean (WTNP) (13°–20°N, 120°–160°E). Our independent evidence on the basis of both in situ N2 fixation activity and diazotroph community structure showed the dominance of unicellular N2 fixation over majority of the WTNP surface waters during the sampling periods. Moreover, a shift in the diazotrophic composition from unicellular cyanobacteria group B-dominated to Trichodesmium spp.-dominated toward the western boundary current (Kuroshio) was also observed in 2013. We hypothesize that nutrient availability may have played a major role in regulating the biogeography of N2 fixation. In surface waters, volumetric N2 fixation rate (calculated by nitrogen) ranged between 0.6 and 2.6 nmol/(L·d) and averaged (1.2±0.5) nmol/(L·d), with < 10 μm size fraction contributed predominantly (88%±6%) to the total rate between 135°E and 160°E. Depth-integrated N2 fixation rate over the upper 200 m ranged between 150 μmol/(m2·d) and 480 μmol/(m2·d) (average (225±105) μmol/(m2·d). N2 fixation can account for 6.2%±3.7% of the depth-integrated primary production, suggesting that N2 fixation is a significant N source sustaining new and export production in the WTNP. The role of N2 fixation in biogeochemical cycling in this climate change-vulnerable region calls for further investigations. |
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| Keywords: | western tropical North Pacific Ocean (WTNP) N2 fixation 15N isotope tracer assay unicellular diazotroph |
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