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| 沙海蜇(Nemopilema nomurai)代谢及分解过程对水环境理化因子及浮游植物影响的研究 |
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郑珊1,2, 孙晓霞1,2,3
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1.中国科学院海洋研究所 山东胶州湾海洋生态系统国家野外科学观测研究站, 青岛 266071;2.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, 青岛 266071;3.中国科学院大学, 北京 100049
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| 摘要: |
| 从上行控制角度，通过野外采样和围隔培养实验，研究了水母的代谢及分解过程对水体环境中pH、溶解氧、营养盐组成的影响，以及该过程中浮游植物的变化。实验结果表明，沙海蜇在代谢过程中短时间内会大量消耗水体中的溶解氧（dissolved oxygen，DO），使水体出现低氧和轻度酸化。代谢过程释放出大量营养盐，使水体中的溶解无机氮（dissolved inorganic nitrogen，DIN）浓度在24h内增加为原来的12倍，溶解无机磷（dissolved inorganic phosphorus，DIP）浓度增加了40多倍，进而引起水体中叶绿素a（chlorophyll a，chl a）浓度的增加。沙海蜇的分解过程使水体表现出明显的低氧（缺氧）和酸化现象。沙海蜇生物量越大，分解时间越长，对水体的改变程度越明显，此外，还释放出大量的营养盐并改变原有的营养盐结构，可以刺激甲藻和绿藻的生长，甚至可能引发藻华。 |
| 关键词: 沙海蜇 代谢过程 分解过程 浮游植物 动态变化 |
| DOI：10.12036/hykxjk20170804001 |
| 分类号:Q178.53 |
| 基金项目:鳌山科技创新计划（2016ASKJ02-4）；国家重点基础研究发展计划课题（2014CB441504）；中国科学院战略性先导科技专项子课题（XDA11030204）。 |
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| Studies on Phytoplankton Dynamics during Metabolism and Decomposition of Jellyfish Nemopilema nomurai |
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ZHENG Shan1,2, SUN Xiao-Xia1,2,3
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1.Jiaozhou Bay Marine Ecosystem Research Station, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;3.University of Chinese Academy of Sciences, Beijing 100049, China
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| Abstract: |
| We studied the bottom-up regulation of phytoplankton by jellyfish during respiration and decomposition. Results suggested that, in 24 hours, seawater acidification and hypoxia occurred during the respiration of Nemopilema nomurai. Meanwhile, inorganic nutrients regenerated by N. nomurai substantially increased the seawater concentrations of DIN (NH4+-N and NOx-N) and DIP (PO43--P); this led to an increase in chlorophyll a concentration. The decomposition of N. nomurai resulted in significant oxygen deficiency and acidification of the seawater, and this became more severe when the biomass of N. nomurai was increased. Numerous inorganic nutrients were released into the seawater; the structures of inorganic nutrients changed significantly, and dinoflagellates and chlorophyta bloomed. |
| Key words: Nemopilema nomurai Metabolism Decomposition Phytoplankton Dynamics |
