中文摘要：

2010 我们在华南海的沿海的水里执行了短术语 pCO2/pH 不安实验评估海水使发酸(低 pH/high pCO2 ) 和太阳的紫外放射的联合效果(UVR， 280400 nm ) 在浮游植物集合的光合的碳固定上。在光合地活跃的放射(同等)下面独自一个的处理，有增加的 pH 的减少的 pCO2 ( 190 ppmv )处于光合的碳固定率(大约23%)导致了重要减少，当充实时，有降低的 pH 的 pCO2 ( 700 ppmv )没与周围的水平相比在光合的表演上有重要效果。明显的光合的效率在减少的 pCO2 水平下面减少了，可能由于象精力一样的 C 限制为碳的起来规定正在被分叉集中机制(CCM ) 。面对 UVR，紫外 A 并且 UV-B 引起了光合的抑制，不过紫外 A 看起来在更低的同等层次下面提高光合的效率。UV-B 在减少的 pCO2 水平下面引起了光合作用的更少的抑制，因为它对无机的碳(Ci ) 的贡献，可能，获得处理。在海水使发酸条件(充实的 pCO2 ) 下面，紫外 A 并且 UV-B 与周围的 pCO2 条件相比把光合的碳固定归结为更高的程度。我们结束那太阳紫外并且海水使发酸能 synergistically 禁止光合作用。

英文摘要：

We carried out short term pCO2/pH perturbation experiments in the coastal waters of the South China Sea to evaluate the combined effects of seawater acidification （low pH/high pCO2） and solar UV radiation （UVR, 280--400 nm） on photosynthetic carbon fixation of phytoplankton assemblages. Under photosynthetically active radiation （PAR） alone treatments, reduced pCO2 （190 ppmv） with increased pH resulted in a significant decrease in the photosynthetic carbon fixation rate （about 23%）, while enriched pCO2 （700 ppmv） with lowered pH had no significant effect on the photosynthetic performance compared to the ambient level. The apparent photosynthetic efficiency decreased under the reduced pCO2 level, probably due to C-limitation as well as energy being diverged for up-regulation of carbon concentrating mechanisms （CCMs）. In the presence of UVR, both UV-A and UV-B caused photosynthetic inhibition, though UV-A appeared to enhance the photosynthetic efficiency under lower PAR levels. UV-B caused less inhibition of photosynthesis under the reduced pCO2 level, probably because of its contribution to the inorganic carbon （Ci）-acquisition processes. Under the seawater acidification conditions （enriched pCO2）, both UV-A and UV-B reduced the photosynthetic carbon fixation to higher extents compared to the ambient pCO2 conditions. We conclude that solar UV and seawater acidification could synergistically inhibit photosynthesis.