水体N:P比对甲藻藻华响应阳光紫外辐射机制的影响研究

项目名称： 水体N:P比对甲藻藻华响应阳光紫外辐射机制的影响研究

项目编号： No.41306106

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 关万春

作者单位： 温州医科大学

项目金额： 23万元

中文摘要： 随着全球环境的逐渐恶化，一方面，导致臭氧层变薄，使得达到地球表面的阳光紫外辐射强度增强，从而抑制浮游植物的生长、改变细胞形态和大小，并影响着浮游植物的营养代谢。最新研究发现北极也出现了大规模的臭氧空洞，因此，急需在北半球广泛开展阳光紫外辐射的研究；另一方面，人类活动导致水体出现的富营养化现象，如N、P营养盐浓度的增加及N:P比例改变，提高了河口沿岸水域浮游植物生物量，有害藻华频发。作为受到人类影响最严重的河口沿岸水域，同时也是受到这两个环境因子影响最显著的区域。而有关这两个环境因子的耦合效应如何影响有害藻华，目前尚缺乏认识。为此，本项目选取可产生有害藻华的米氏凯伦藻和塔玛亚历山大藻作为目标藻，探讨不同N:P比例背景下，有害藻华对阳光紫外辐射的响应机制，并分析阳光紫外辐射与水体营养盐比例改变（N:P）对有害藻华的耦合效应。

中文关键词： 有害藻华；N:P比；紫外辐射；米氏凯伦藻；塔玛亚历山大藻

英文摘要： With the global environment deterioration by human activity, it was increased significantly that the solar ultraviolet radiation (UVR) reached to the earth surface because of the damaged ozone layer, and that eutrophication around coastal area tended to be more serious with the water pollution. Solar UVR inhibited the growth of phytoplankton, changed the cellular morphology, and adjusted the metabolism of nutrients, whereas eutrophication increased the biomass of phytoplankton and led to harmful algae bloom (HAB) breakout. The phytoplankton, which is the most important part of the primary producer in the ocean, not only affected by solar UVR, but also by eutrophication. It was, however, ambiguous how these two environmental factors impacted on the HAB until now. So, this project aimed to study the following questions, 1) the co-effect of solar UVR and ratio of N:P on HAB, 2) the response of HAB to solar UVR under different N:P ratio. The typical species around the China coastal water zone, Karenia mikimotoi and Alexandrium taramarens were chose in this project. The quartz incubators and three kinds of cut-off filters were used for the whole experiments to insure the cells can receive the three different solar radiation treatments, 1) photosynthetic activity radiation (PAR, 395-700nm), 2) photosynthetic activity

英文关键词： HAB；N:P ratio；ultraviolet radiation；Karenia mikimotoi；Alexanderium tamarense