用南黄海沉积岩心中氮同位素重建海水营养盐利用率的历史变化

蔡德陵; 杨庶; 王玉堃; 杨茜; 孙耀

doi:10.3969/j.issn.0253-4193.2019.02.003

用南黄海沉积岩心中氮同位素重建海水营养盐利用率的历史变化

doi: 10.3969/j.issn.0253-4193.2019.02.003

1.
中国水产科学研究院黄海水产研究所农业农村部海洋渔业可持续发展重点实验室, 山东青岛 266071;自然资源部第一海洋研究所, 山东青岛 266061
2.
中国水产科学研究院黄海水产研究所农业农村部海洋渔业可持续发展重点实验室, 山东青岛 266071;山东大学海洋研究院, 山东青岛 266237
3.
中国水产科学研究院黄海水产研究所农业农村部海洋渔业可持续发展重点实验室, 山东青岛 266071

基金项目: 国家重点基础研究发展计划项目（2015CB453303）；国家自然科学基金青年项目（41606130）。

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出版历程
- 收稿日期: 2018-04-02
- 修回日期: 2018-06-20

Historical changes of nutrient utilization of seawater reconstructed with nitrogen isotopes in sedimentary cores from the southern Yellow Sea

1.
Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fisheries Science, Qingdao 266071, China;First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
2.
Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fisheries Science, Qingdao 266071, China;Institute of Marine Science and Technology, Shandong University, Qingdao 266237, China
3.
Key Laboratory of Sustainable Development of Marine Fisheries, Ministry of Agriculture and Rural Affairs, Yellow Sea Fisheries Research Institute, Chinese Academy of Fisheries Science, Qingdao 266071, China

摘要

摘要: 基于2006年黄东海航次获得的表层沉积物和2009年航次南黄海3个柱状沉积物岩心，分析了表层沉积物总氮（TN）、C/N比值和氮稳定同位素比值（δ¹⁵N）的分布特征及南黄海柱状沉积物中这些参数的长期变化规律。结果表明，黄海、东海表层沉积物TN含量、C/N比值和δ¹⁵N的变化范围分别为0.023%~0.33%、1.4~50.3和4.0‰~16.0‰。其中，TN与C/N比值存在较显著的负相关性，而TN与δ¹⁵N以及C/N比值与δ¹⁵N之间无明显的相关性，这反映出黄海和东海陆架边缘海中氮循环的复杂性。对南黄海柱状沉积物的分析结果表明：3个柱状岩心中的TN、C/N比值和δ¹⁵N随年代的波动均呈现一定的周期性变化趋势。3个岩心中TN随年代的变化趋势基本一致，100 a来总体呈波动上升趋势，且3个岩心中C/N比值也呈较为类似的变化趋势。柱状沉积物中δ¹⁵N的平均变化周期约为24 a左右。由此，重建200 a来南黄海海水中营养盐利用率的历史变化，并初步探讨了其对气候变化的响应。
- 沉积岩心 /
- 南黄海 /
- C/N /
- δ¹⁵N /
- 营养盐利用率
Abstract: The distributions of total nitrogen (TN), C/N, and nitrogen stable isotope ratio (δ¹⁵N) in surface sediments are first studied in the Yellow Sea and East China Sea. The content of TN in surface sediment ranges from 0.023% to 0.33%, while C/N and δ¹⁵N are about 1.4-50.3 and 4.0‰-16.0‰ respectively. Significant negative correlation exists between TN and C/N, and no correlation is found between TN and δ¹⁵N or between C/N and δ¹⁵N. These relationships reflect the complexity of the nitrogen cycles in the Yellow Sea and the East China Sea, both belonging to typical continental shelf marginal sea. Then, three sediment cores collected from the southern Yellow Sea were analyzed for TN, C/N and δ¹⁵N values. And the long-term change trends of TN, C/N and δ¹⁵N were subsequently rebuilt combing with ²¹⁰Pb chronological study. The results indicate that the long-term changes of TN, C/N and δ¹⁵N show some periodical trends. The temporal changes of TN show similar change trends in the three sea areas, with generally increasing trends over the past 100 years. And C/N trends also follow relatively similar patterns in the three sediment cores, while the average cycle of δ¹⁵N is about 24 years. Finally, the historical changes of nutrient usability in the upper water of the southern Yellow Sea over the past 200 years are reconstructed, and their responses to climate change are discussed preliminarily.
- sediment core /
- the southern Yellow Sea /
- C/N /
- δ¹⁵N /
- nutrient usability

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