丁月旻^1,2, 颜天^1,3,4, 耿慧霞^1,3, 周名江¹
1.中国科学院海洋生态与环境科学重点实验室, 山东 青岛 266071;2.中国科学院大学, 北京 100049;3.青岛海洋科学与技术试点国家实验室海洋生态与环境科学功能实验室, 山东 青岛 266237;4.中国科学院海洋大科学研究中心, 山东 青岛 266071

摘要:
在实验室内选用不进行营养盐加富的流水系统模拟研究了浒苔（Ulva prolifera）对海水营养盐的吸收，测定了浒苔体内不同形态的碳、氮、磷的含量变化，探讨了浒苔对海水中碳、氮、磷3种生源要素的转化作用。结果显示，流动海水的实验体系是一个能给藻体创造稳定环境的模拟装置，可以不断地给藻体更新海水和补充营养盐。浒苔对海水中溶解无机氮（DIN）、溶解有机氮（DON）、溶解无机磷（DIP）和溶解有机磷（DOP）都有吸收作用，其平均吸收速率分别为10.87 μmol·g^-1·d^-1、2.41 μmol·g^-1·d^-1、0.183 μmol·g^-1·d^-1和0.023 μmol·g^-1·d^-1。光照时段的DTN和DTP的平均吸收速率与无光照时段的平均吸收速率没有显著差异（P>0.05）。浒苔对海水中无机形态的营养盐的吸收量高于对该元素的有机形态的吸收量；而浒苔的体内有机形态的成分均远高于无机形态的成分。浒苔对无机形态的氮、磷和碳转化为自身有机形态的转化效率分别为：97.33%，99.99%和96.84%。以上结果表明，浒苔能快速吸收无机形态的生源要素并转化为有机形态，能够加快生源物质进入生态系统的物质循环。
关键词:浒苔生源要素流水系统
DOI：10.11759/hykx20190815001
分类号:P76;Q93
基金项目:国家重点研发计划（2016YFE0101500）；中国科学院战略性先导科技专项（A类）资助（XDA23050302）；科技基础资源调查专项（2018FY100200）；山东省重大科技创新工程专项“健康海洋”技术创新工程（2018SDKJ0504-4）；现代农业产业技术体系专项资金资助（CARS-50）；国家基金委-山东省联合基金项目（U1606404）；中国科学院海洋大科学研究中心重点部署项目（COMS2019Q05）；国家自然科学基金委面上项目（41676106）

Experimental study of nutrients absorption and transformation by Ulva prolifera in a flowing water system
DING Yue-min^1,2, YAN Tian^1,3,4, GENG Hui-xia^1,3, ZHOU Ming-jiang¹
1.CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China;4.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
Abstract:
In this study, an experiment involving flowing water without nutrient addition was conducted to investigate the nutrients absorption by Ulva prolifera, determine the carbon, nitrogen, and phosphorus contents in the thalli, and evaluate the transformation of the three biogenic nutrients (N, P, C) by the thalli. The results showed that the flowing water system could create a stable environment and continue to supplement nutrients for the thalli. Moreover, all sorts of nutrients, induding dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP), dissolved organic nitrogen (DON), and dissolved organic phosphorus (DOP) in seawater were absorbed by the thalli in the experiment. The corresponding average absorption rates were 10.87, 2.41, 0.183, and 0.023 μmol·g^-1·d^-1, respectively. The average absorption rates of dissolved total phosphorus (DTP) and dissolved total nitrogen (DTN) in the illuminated period was not significantly different from that in the dark period (P>0.05). The thalli absorbed more inorganic nutrients than organic nutrients in the seawater; however, the inorganic nutrients content in the thalli was lower than the organic nutrients content. The transformation efficiencies of the inorganic forms of N, P, and C into their organic forms were 97.33%, 99.99%, and 96.84%, respectively. The results show that the U. prolifera could quickly absorb inorganic nutrients and transform them into organic nutrients, which accelerated the input of biogenic nutrients into the nutrient cycle of the ecosystem.
Key words:Ulva proliferabiogenic nutrientsflowing water system





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