| 西太平洋Y3海山对营养盐的影响及其生态环境效应 |
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| 引用本文： | 马骏,宋金明,李学刚,袁华茂,李宁,段丽琴,王启栋. 西太平洋Y3海山对营养盐的影响及其生态环境效应[J]. 地学前缘, 2020, 27(4): 322-331. DOI: 10.13745/j.esf.sf.2019.8.16 |
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| 作者姓名： | 马骏 宋金明 李学刚 袁华茂 李宁 段丽琴 王启栋 |
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| 作者单位： | 1.中国科学院 海洋研究所 中国科学院海洋生态与环境科学重点实验室, 山东 青岛 2660712.青岛海洋科学与技术国家实验室 海洋生态与环境科学功能实验室, 山东 青岛 2662373. 中国科学院大学, 北京 1000494. 中国科学院 海洋大科学研究中心, 山东 青岛 266071 |
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| 基金项目： | 科学技术部科技基础资源调查专项(2017FY100802);中国科学院战略性先导科技专项(XDA19060401);青岛海洋科学与技术国家实验室鳌山科技创新计划项目(2016ASKJ14) |
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| 摘 要： | 作为大洋典型地貌特征的海山,其邻近的海洋生境并不被人熟知。依据2014年冬季对热带西太平洋Y3海山及其邻近海域的综合调查,首次探讨了该海山区海水中营养盐的分布特征及其与生态环境的耦合关系。结果表明Y3海山区是典型的热带寡营养海域。在50~125 m的深度,温跃层和高盐区双重作用对底部高浓度营养盐向上输送的阻碍,是导致真光层上部营养盐浓度较低的重要原因;同时,浮游植物和异养细菌的消耗也加剧了该区域营养盐的缺乏。Y3海山突出的地形地貌对营养盐的分布产生重要的影响,海山对流经的海流产生阻碍,形成上升流,使底部高浓度的营养盐突破温跃层和高盐区的阻碍向上输送,从而使海山周围营养盐的平均浓度高于远离海山的海域。相关性分析显示,Y3海山区真光层中营养盐浓度与温度、盐度、叶绿素a浓度和异养细菌丰度分别呈负相关、正相关、负相关(除NO2-N外)和负相关关系。海山区特殊的营养盐分布及其与生态环境的耦合是其成为一种独特的大洋生态系统的重要因素。
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| 关 键 词： | 西太平洋海山 营养盐 生态环境 耦合关系 |
| 收稿时间： | 2019-01-09 |
Effects of Y3 seamount on nutrients influencing the ecological environment in the Western Pacific Ocean |
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| MA Jun,SONG Jinming,LI Xuegang,YUAN Huamao,LI Ning,DUAN Liqin,WANG Qidong. Effects of Y3 seamount on nutrients influencing the ecological environment in the Western Pacific Ocean[J]. Earth Science Frontiers, 2020, 27(4): 322-331. DOI: 10.13745/j.esf.sf.2019.8.16 |
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| Authors: | MA Jun SONG Jinming LI Xuegang YUAN Huamao LI Ning DUAN Liqin WANG Qidong |
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| Affiliation: | 1. CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China2. Marine Ecology and Environmental Science Laboratory, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China3. University of Chinese Academy of Sciences, Beijing 100049, China4. Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China |
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| Abstract: | Seamount is a typical landform in the ocean, yet its surrounding habitat is poorly understood. Here, we report our study on the coupling relationships between nutrients and ecological environment through a comprehensive investigation on the Y3 seamount area of the Tropical Western Pacific Ocean in the winter of 2014. The results showed that the Y3 seamount area is a typical tropical oligotrophic region. At 50-125 m depth, the combined effects of thermocline and high-salt area hinder the upward transport of high-concentration nutrients from the sea bottom, causing nutrient depletion in the upper part of the euphotic zone. Meanwhile, consumption of phytoplankton and heterotrophic bacteria also reduces nutrients in this region. However, the abrupt topography of seamount plays an important role in nutrient distribution. The Y3 seamount obstructs the current to form an upwelling, which promotes the upward transport of high-concentration nutrients from the sea bottom to break through the barriers of thermocline and high-salt area; as a result, the average nutrient concentrations are higher around the seamount than further away. The correlation analysis showed that in the euphotic zone, the signs of correlation between nutrient concentration and temperature, salinity, chlorophyll a concentration or heterotrophic bacteria abundance were (-), (+), (-) (except NO2-N) and (-), respectively. Its distinct nutrient distribution, coupled with the ecological environment, makes seamount an important factor for the unique ocean ecosystem. |
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| Keywords: | seamount in the Western Pacific Ocean nutrients ecological environment coupling relationships |
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