夏季南海浮游植物光合固碳对不同波长阳光紫外辐射的响应  

Photosynthetic response of surface water phytoplankton assemblages to different wavebands of UV radiation in the South China Sea

作　　者：吴亚平[1] 高坤山[1] 

机构地区：[1]厦门大学近海海洋环境科学国家重点实验室,福建厦门361005

出　　处：《海洋学报》2011年第5期146-151,共6页

基　　金：国家973计划项目(2009CB421207)

摘　　要：阳光紫外(UV)辐射影响浮游植物光合固碳,且不同波长UV辐射的生理效应不一。本文以夏季南海近岸海域浮游植物为研究对象,采用生物加权函数(Biological weighting function,BWF,亦被称为UV辐射作用光谱)的研究方法,探讨了不同波长UV辐射对浮游植物群落光合固碳的作用。结果表明,在只有可见光情况下的光合固碳速率最高,实验期间平均为10.86μg/(μg.h),当暴露于含UV辐射的阳光下,光合固碳速率明显下降,且接受的辐射波长越短,固碳量越低;在全波段阳光辐射下培养的最低,每小时平均为6.51μg,此时UVR的相对抑制率约为40%。同时BWF显示不同波长的紫外辐射抑制能力不一,波长越短抑制能力越强,UV-B最短波长(280 nm)的单位光能抑制率为UV-A(>320 nm)的100万倍以上。The photosynthetic carbon fixation of phytoplankton was affected significantly by solar UV radiation,while these effects are wavelength dependent.We investigated the photosynthetic carbon fixation by surface water phytoplankton assemblages of the South China Sea in summer under different radiation treatments to evaluate the photosynthetic response to different wavelength of UVR.The photosynthetic carbon fixation rate was the highest under PAR treatment,with the mean value of 10.86 μg/（μg·h）.When the samples were exposed to PAR＋UV radiation,the photosynthetic carbon fixation rate decreased significantly,the shorter wavelength exposed,the lower photosynthetic carbon fixation rate observed.As a result,the photosynthetic carbon fixation rate under full spectrum of solar radiation was the lowest,with the mean value of 6.51 μg/（μg·h）,the relative inhibition induced by UVR was about 40%.Moreover,the effects of UV radiation were wavelength dependent,biological weighting function（BWF） indicated that the shorter wavelength of UVR,the higher inhibition per energy induced.The biological weight of the shortest wavelength of UV-B（i.e.280 nm） was at least 106 times of the UV-A（320 nm）.

关 键 词：BWF 光合固碳 浮游植物 紫外辐射 作用光谱 

分 类 号：Q945.11[生物学—植物学]