汕头南澳岛沿岸浮游植物对阳光紫外辐射响应的研究

摘要

In order to know the effects of solar UV radiation (280 -400 nm) on coastal phyioplankton in Nan'ao, Shantou, the relationship between photosynthetic carbon fixation and solar radiation were examined under full spectrum solar radiation or filtering out UVR or UV-B. The biological weighting function (BWF) was checked. It was found that solar UVR suppressed the photosynthetic carbon fixation. However, the less inhibition was detected when solar UVR or UV-B were cut-off. The most serious inhibition was observed under the 100% whole solar radiation. The BWF showed that phytoplankton was more sensitive to UV-B than UV-A.%为了阐明汕头南澳岛沿岸表层水体浮游植物群落对阳光紫外辐射(UVR,280～400nm)变化的响应,试验检测了浮游植物在全波段阳光和滤除UVR或UV-B条件下的光合固酸随光强的变化关系,同时还检测了浮游植物群落的紫外辐射作用光谱(BWF).结果表明,阳光UVR可以明显的抑制浮游植物的光合固碳,当滤除UVR后,光合固碳受到的抑制程度下降.在100％阳光辐射条件下,光合固碳受到的抑制程度最大.紫外辐射作用光谱显示,浮游植物对UV-B最敏感,其抑制程度显著大于UV-A波段.