不同光照条件下浒苔与三种赤潮微藻的竞争  

Competition between Ulva prolifera and three red tide microalgae under different light conditions

作　　者：高颖超 杨雪 林锟 谭丽菊[1] 王江涛[1] GAO Ying-chao;YANGXue;LIN Kun;TAN Li-ju;WANG Jiang-tao(College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China)

机构地区：[1]中国海洋大学化学化工学院

出　　处：《中国环境科学》2019年第8期3404-3411,共8页China Environmental Science

基　　金：国家重点研发计划项目(2016YFC1402101);国家自然科学基金资助项目(41876078);中央高校基本科研业务费资助项目(201713059)

摘　　要：针对苏北浅滩水体浊度高、营养盐含量大、且被大多数学者认为是南黄海绿潮起源的实际情况,本文通过室内培养实验,研究了不同光照条件(0~4500lx)下浒苔与中肋骨条藻、东海原甲藻和新月菱形藻对营养盐的竞争作用;并与苏北浅滩实际水体光照相结合,评估了浒苔与3种微藻在不同深度下的生理状态.浒苔与微藻的竞争,是决定暴发何种藻华的关键因素之一.结果表明,与3种微藻相比,浒苔对光照的适应性更强,最大日均相对增长率为11.91%/d.微藻与浒苔共培养时,生长情况明显劣于单独培养,中肋骨条藻、东海原甲藻和新月菱形藻的生长抑制率分别为30%~46%,3%~44%,25%~41%,并且不同微藻对竞争作用的响应不同.营养盐监测数据表明,对有限营养盐的争夺是浒苔和微藻竞争作用的主要机制,研究结果为苏北浅滩浒苔绿潮的暴发机制提供了依据.There are high turbidity and large nutrient content in seawater of Subei Shoal,which is considered by most scholars to be the origin of the green tide in the South Yellow Sea.The competition between Ulva prolifera and Skeletonema costatum,Prorocentrum donghaiense and Nitzschia closterum for nutrients under different light conditions(0~4500lx)was compared and the physiological state of U.prolifera and three microalgae at different depths was evaluated combining with the actual illumination of Subei Shoal.The competition between U.prolifera and microalgae is one of the key factors determining which kind of algal bloom.The results showed that U.prolifera is more adaptable to light compared with the three microalgae,the maximum average relative growth rate was 11.91%/d.When microalgae were co-cultured with U.prolifera,the growth was significantly inferior to that of culture alone,the inhibition rates of S.costatum,P.donghaiense and N.closterum respectively were 30%~46%,3%~44%,25%~41%,and the responses of different microalgae on competition were different.The nutrients monitoring data indicated that the competition for limited nutrients was the main competitive mechanism between U.prolifera and microalgae.This result provided a basis for the outbreak mechanism of the green tide in Subei Shoal.

关 键 词：浒苔 微藻 光照强度 营养盐 竞争作用 

分 类 号：X172[环境科学与工程—环境科学]