Photosynthetic carbon fixation by tropical coral reef phytoplankton assemblages: a UVR perspective

Photosynthetic carbon fixation by tropical coral reef phytoplankton assemblages: a UVR perspective
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热带珊瑚礁浮游植物组合的光合碳固定:紫外线视角

DOI:
10.4490/algae.2013.28.3.281
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发表时间:
2013-09
期刊:
影响因子:
3.2
通讯作者:
Li G, Che ZW, Gao KS
Li G, Che ZW, Gao KS
中科院分区:
生物学3区
文献类型:
--
作者:
Li G, Che ZW, Gao KS

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光合作用固碳调节珊瑚礁沃茨的海气CO2通量。然而,关于太阳紫外辐射(UVR,280-400 nm)对这些生态系统中浮游植物光合行为的影响的研究却很少。为了评估上述情况,从南中国海收集的表面居住的热带珊瑚礁浮游植物组合暴露于太阳辐射(即,光合有效辐射[PAR] + UV辐射A [UVA] + UV辐射B [UVB],280-700 nm; PAR + UVA,320-700 nm;和PAR,400-700 nm)。在静态条件下,UVA和UVB显着减少碳固定的最大值分别为22.4%和15.3%,而较低的紫外线相关的光合抑制浮游植物样品进行混合的情况下观察。在中等水平的混合(即,循环时间80 min),UVA和UVB引起的抑制作用分别降低52.1%和79.6%。基于此,可以说自然环境中风和/或潮汐引起的垂直混合可以减少太阳紫外线对珊瑚礁水中浮游植物生产力的抑制作用。
Photosynthetic carbon fixation regulates air-sea CO 2 fluxes in the waters of coral reefs. However, little has been docu mented on the effects of solar UV radiation (UVR, 280-400 nm) upon photosynthetic behaviors of phytoplankton dwelling in these ecosystems. In order to evaluate the aforesaid, surface dwelling tropical coral reef phytoplankton assemblages collected from the South China Sea were exposed to solar radiation (i.e., photosynthetically active radiation [PAR] + UV radiation A [UVA] + UV radiation B [UVB], 280-700 nm; PAR + UVA, 320-700 nm; and PAR, 400-700 nm) under static or simulated-mixing conditions. Under the static condition, UVA and UVB significantly reduced the carbon fixation with the maximum of 22.4 and 15.3%, respectively; while lower UVR-related photosynthetic inhibition was observed in case of phytoplankton samples being subjected to mixing. At a moderate level of mixing (i.e., circulation time 80 min), the UVA and UVB caused inhibition were lowered by 52.1 and 79.6%, respectively. Based on this it could be stated that vertical mixing induced by winds and/or tides in the natural environments could reduce the inhibitory effect of solar UVR on phytoplankton productivity in the coral reefs water.
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