| 沙海蜇(Nemopilema nomurai)消亡过程中海水溶解氧变化的模拟研究 |
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| 引用本文： | 宋金明,马清霞,李 宁,李学刚,袁华茂,段丽琴,曲宝晓.沙海蜇(Nemopilema nomurai)消亡过程中海水溶解氧变化的模拟研究[J].海洋与湖沼,2012,43(3):502-506. |
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| 作者姓名： | 宋金明 马清霞 李 宁 李学刚 袁华茂 段丽琴 曲宝晓 |
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| 作者单位： | 1. 中国科学院海洋研究所海洋生态与环境科学重点实验室,青岛,266071
2. 中国科学院海洋研究所海洋生态与环境科学重点实验室,青岛266071 中国科学院研究生院,北京100049 |
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| 基金项目： | 国家重点基础研究发展计划(973)项目, 2011CB403602 号, “海洋环境变化与水母暴发的相互作用”; 国家自然科学基金委员会创新群体项目资助, 41121064 号 |
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| 摘 要： | 采用实验室模拟的方法,研究了不同海水温度、盐度、pH、N/P比下,沙海蜇消亡过程中海水溶解氧的变化特征,这对探讨水母灾害性暴发后消亡的环境影响有重要的科学意义。研究结果表明,沙海蜇的消亡可引起海水溶解氧浓度的显著降低,不同海水温度、盐度、pH、N/P比条件下沙海蜇消亡引起的海水溶解氧浓度的降低无显著差异,但与没有沙海蜇消亡时,海水溶解氧的变化相比则差异显著。沙海蜇消亡一般需要6—7天时间,在高N/P比的海水中,沙海蜇的消亡时间延长。沙海蜇的消亡造成水体的严重缺氧,水体氧饱和度低于20%,从第2天到第3天,本底海水、不同过程温度、盐度、pH条件下,消耗水体氧的量剧增,第6天达到峰值,但不同N/P比条件下,水体溶解氧的降低在第2天即可达到一个耗氧的高值,一直持续到第7天出现峰值;海水温度、盐度、pH、N/P比变化,可导致沙海蜇的消亡过程中水体氧消耗量的变化,就这四种影响因素而言,其平均最大耗氧量从大到小的顺序是:温度(23—30℃区间段)>pH(5.0—9.0区间段)>盐度(21—33区间段)>N/P比(16:1—240:1区间段),分别为39.9、39.7、38.0和35.9mg/(kg.d),相对而言,水体温度和pH对沙海蜇消亡过程中氧消耗量影响较大,水体N/P比和盐度影响较小。所以,沙海蜇消亡过程中,由于海水温度和pH的变化形成的低氧区更为严重,而且在当今富营养化(高N/P比)的近海水域中,水母的消亡高耗氧的时间加长,对海水环境造成的影响更为严重。
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| 关 键 词： | 溶解氧 环境影响 消亡过程 沙海蜇 模拟研究 |
| 收稿时间： | 2011/12/31 0:00:00 |
| 修稿时间： | 2012/2/28 0:00:00 |
SIMULATION OF DISSOLVED OXYGEN(DO) VARIATIONS DURING THE DECOMPOSITION PROCESS OF NEMOPILEMA NOMURAI |
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| SONG Jin-Ming,MA Qing-Xi,LI Ning,LI Xue-Gang,YUAN Hua-Mao,DUAN Li-Qin and QU Bao-Xiao.SIMULATION OF DISSOLVED OXYGEN(DO) VARIATIONS DURING THE DECOMPOSITION PROCESS OF NEMOPILEMA NOMURAI[J].Oceanologia Et Limnologia Sinica,2012,43(3):502-506. |
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| Authors: | SONG Jin-Ming MA Qing-Xi LI Ning LI Xue-Gang YUAN Hua-Mao DUAN Li-Qin and QU Bao-Xiao |
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| Institution: | Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanography, Chinese Academy of Sciences;Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanography, Chinese Academy of Sciences; Graduate University of Chinese Academy of Sciences;Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanography, Chinese Academy of Sciences;Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanography, Chinese Academy of Sciences;Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanography, Chinese Academy of Sciences;Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanography, Chinese Academy of Sciences;Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanography, Chinese Academy of Sciences; Graduate University of Chinese Academy of Sciences |
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| Abstract: | To understand the influence of the decaying process after a large jellyfish bloom on marine environment,laboratory simulation experiments were performed to study the variations of dissolved oxygen(DO) during the decomposition process of Nemopilema nomurai at different temperature,pH,salinity,and N/P ratios.The results suggested that the decomposition of N.nomurai needed a great deal of oxygen,and the extents of DO decrease were not significantly different under different temperature,pH,salinity,and N/P ratio conditions.Complete decomposition of N.nomurai generally took about 6—7 days and more time was needed under high N/P conditions.The decomposition of N.nomurai caused severe hypoxia of the seawater and the oxygen concentration was below 20% of saturation.Oxygen consumption in the simulation experiments dramatically increased from the second day to the third day and it peaked on the sixth or the seventh day.However,the high DO consumption rates under different N/P conditions appeared in the second day and continued to the seventh day.Different temperature,salinity,pH and N/P ratios in the seawaters caused variations in the extents of DO consumption during the decomposition process.The extents of DO consumption were in the order of temperature(23—30℃) > pH(5.0—9.0) > salinity(21—33) > N/P ratio(16:1—240:1),and the values of 39.9,39.7,38.0,and 35.9 mg/(kg.d),respectively.Consequently,the influence of temperature and pH on the DO consumption was more significant and the influence of N/P ratio and salinity was relatively small. |
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| Keywords: | Dissolved oxygen (DO) Marine environment factors Decomposition Nemopilema nomurai Simulation test |
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