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苏北浅滩养殖筏架附生绿藻入海过程在黄海绿潮形成中的作用
张清春1,2,3, 孔凡洲1,2,3, 颜天1,2,3, 于仁成1,2,4,3, 胡晓坤1,4, 苗辉1, 周名江1
1.中国科学院海洋生态与环境科学重点实验室 中国科学院海洋研究所 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.中国科学院海洋大科学 研究中心 青岛 266071;4.中国科学院大学 北京 100049
摘要:
本研究采用现场定量观测为主的研究方法,在2017年5月期间对苏北浅滩竹根沙收紫菜养殖筏架作业过程进行跟踪调查;对养殖筏架绠绳附生绿藻自然脱落和收筏架作业过程人为刮落附生绿藻,以及收筏架作业前后入海的漂浮绿藻生物量进行定量观测。结果表明:筏架绳附生绿藻自然脱落率低,为3.58%±0.78%;收筏架作业过程中绠绳上刮落绿藻生物量为(12±3) kg湿重/根,由此估算2017年整个苏北浅滩刮落的生物量估算可达到万吨湿重;收筏架作业后海域漂浮绿藻生物量是作业前的7.6倍。研究结果进一步明确了收筏架作业过程中人为刮落绿藻是目前筏架附生绿藻最主要的入海方式。刮落绿藻是海水中漂浮绿藻的主要来源,其生物量对南黄海绿潮的规模大小有重要的影响。研究结果为绿潮防控措施的制定和实施提供科学依据。
关键词:  黄海  绿潮  苏北浅滩  绿藻  养殖筏架
DOI:10.11693/hyhz20180400076
分类号:Q14
基金项目:青岛海洋科学与技术国家实验室鳌山科技创新计划项目,2016ASKJ02号;中国科学院战略性先导科技专项(A类)资助,XDA11020300号;国家基金委-山东省联合基金项目,U1606404号。
GREEN ALGAE DETACHED FROM AQUACULTURE RAFTS INTO SEAWATER RESULTED IN GREEN TIDE OCCURRENCE IN THE YELLOW SEA
ZHANG Qing-Chun1,2,3, KONG Fan-Zhou1,2,3, YAN Tian1,2,3, YU Ren-Cheng1,2,4,3, HU Xiao-Kun1,4, MIAO Hui1, ZHOU Ming-Jiang1
1.CAS Key Laboratory of Marine Ecology and Environmental Sciences, 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.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China;4.University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:
We analyzed the different approaches of green algae attached on Porphyra yezoensis aquaculture rafts into seawater via natural falling off and artificial cleanup during aquaculture facility withdrawal in the Zhugensha Sandbank, Subei Shoal, the Yellow Sea, in May 2017, and the causative relation to on green algae bloom occurrence. Floating green algae were sampled before and after the withdrawal. We found the biomass of the floating green algae after raft withdrawal was 7.6 times more than that before the withdrawal. And only 3.58%±0.78% of the attached algae could fall off from the rafts naturally, while the artificial cleanup was (12±3)kg (wet weight)/rope, based on which the total biomass of the field could amount to 10000t (wet weight) in the shoal area by estimate. Therefore, the green algae detached from the culture devices into seawater by artificial cleanup as the "seed" resulted in later floating green algae bloom in the Yellow Sea. These results shall be insightful to the monitoring and preventing of green tides in the Yellow Sea.
Key words:  the Yellow Sea  green tide  Subei Shoal  green algae  aquaculture raft
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