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热带海洋学报 ›› 2016, Vol. 35 ›› Issue (1): 102-111.doi: 10.11978/2015001CSTR: 32234.14.2015001

• 海洋生物学 • 上一篇    

固氮作用对黑潮上游区域生态系统影响的模拟研究

王艳君1, 2, 董园1, 陈寅超1, 周卫文1, 李芊1   

  1. 1. 中国科学院南海海洋研究所, 广东 广州 510301;
    2. 惠州学院, 广东 惠州 516007
  • 收稿日期:2014-12-30 出版日期:2016-01-10 发布日期:2016-02-02
  • 作者简介:王艳君(1982—), 女, 广东省广州市人, 博士研究生, 研究方向为环境科学。E-mail: yanjun_wang82@126.com
  • 基金资助:
    中国科学院战略性先导科技专项项目资助(XDA11020201-4)

Modeling the impact of N2-fixation on the ecosystem dynamics in the upstream Kuroshio

WANG Yanjun1, 2, DONG Yuan1, CHEN Yinchao1, ZHOU Weiwen1, LI Qian1   

  1. 1. South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;
    2. HuiZhou University, Huizhou 51600, China
  • Received:2014-12-30 Online:2016-01-10 Published:2016-02-02
  • Contact: LI Qian, E-mail: qianli@scsio.ac.cn
  • Supported by:
    The Strategic Priority Research Program of the Chinese Academy of Science (XDA11020201-4)

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2 | 1

摘要： 为了研究固氮作用对黑潮上游区域生态系统的影响, 建立了一个包含固氮生物在内的NPZD(nutrient, phytoplankton, zooplankton, detritus)生物模型, 初步模拟结果与观测结果相吻合。通过比较模型中有固氮生物和无固氮生物两种情况下, 黑潮上游区域生态系统各参量以及各级生产力的差异, 揭示了该区域固氮生物的季节性分布特征, 阐明了固氮作用对海洋生态系统动力过程的重要影响。结果表明, 固氮生物由于水文和化学因素的影响, 主要出现在夏、秋季。固氮产生的新氮源使黑潮上游区域硝酸盐、铵盐、浮游动植物和大小碎屑的量都有明显增加。浮游植物的平均生长速率提高了大约64%, 初级生产力、再生生产力和新生产力分别增加了30%左右。在夏季50m以浅水体, 固氮作用支持了50%~80%的新生产力, 是新生产力的主要贡献者; 而在50~200m水体, 固氮作用支持了10%~50%的新生产力, 深层水的垂直混合带来的氮营养盐成为新生产力的主要贡献者。

关键词: NPZD模型, 黑潮, 固氮, 生态系统, 新生产力

Abstract: An NPZD(nutrient, phytoplankton, zooplankton, detritus) model with incorporation of a diazotroph function group was used to simulate the temporal change of ecosystem in the upstream Kuroshio Current. The modeled nutrients, chlorophyll-a, and productivity showed good agreements with the observations. The impacts of N2-fixation on nutrient concentrations, plankton biomass, and detritus were assessed by comparisons of the modeled simulations with and without diazotrophs. Our results suggested that diazotrophs were most abundant in summer and fall when other phytoplankton were nitrogen limited. The mean growth of phytoplankton could increase by 64% with the input of new nitrogen from N2-fixation, leading to 30% increase of primary production, regenerated production, and new production, respectively. In summer, N2-fixation supported 50%~80% of the new production in the upper 50 m, but only 10%~50% in the depths of 50~200 m. This finding suggested that N2-fixation was an important source of new nitrogen for phytoplankton production above 50 m in the upstream Kuroshio, but new production below 50 m was largely contributed by the vertical nutrient fluxes from below.

Key words: NPZD model, Kuroshio, N2-fixation, ecosystem, new production