Impact of solar radiation on the biological removal of dimethylsulfoniopropionate and dimethylsulfide in marine surface waters
Impact of solar radiation on the biological removal of dimethylsulfoniopropionate and dimethylsulfide in marine surface waters
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太阳辐射对海洋表层水中二甲磺基丙酸酯和二甲硫醚生物去除的影响
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
G. Herndl
中科院分区：
文献类型：
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作者：
D. Slezak;A. Brugger;G. Herndl
研究了自然地表太阳辐射对生物去除硫代丙酸二甲酯（DMSP）和二甲基硫（DMS）的影响，并与光化学去除DMSP和DMS进行了比较。将来自北方亚得里亚海和北海沿海的天然细菌组合（0.8 µm过滤海水）暴露于表面太阳辐射并在黑暗中培养;同时测量DMSP和DMS浓度。在0.2 µm过滤海水中测定光化学去除率。在光照下DMSP的生物去除率比在黑暗中获得的生物去除率低62 ± 14%。黑暗处理的生物去除率以及其对太阳辐射的敏感性具有很高的空间和时间变异性，光照处理的去除率为黑暗处理的29%至81%。在光处理（~30 nM）中，DMSP浓度基本上低于暗处理（>80 nM），在该浓度以上，观察到生物DMSP去除速率没有进一步增加。UV-B辐射仅占总抑制的15%，而UV-A和PAR（光合有效辐射）都贡献了总抑制的42%。在太阳辐射下的生物DMS去除仅为在黑暗中的生物DMS去除的~40 ± 14%。在地表太阳辐射下，光化学去除率始终高于暗生物去除率。因此，我们的研究结果表明，在海洋表面沃茨的DMSP和DMS动态的严重影响，由于部分抑制的微生物财团负责DMSP和DMS营业额的太阳辐射。
The effect of natural surface solar radiation on the biological removal of dimethylsulfo- niopropionate (DMSP) and dimethylsulfide (DMS) was determined and compared to the photochem- ical removal of DMSP and DMS. Natural bacterial assemblages (0.8 µm filtered seawater) from the northern Adriatic Sea and the coastal North Sea were exposed to surface solar radiation and incu- bated in the dark; the DMSP and DMS concentrations were measured concurrently. Photochemical removal rates were determined in 0.2 µm filtered seawater. Biological removal of DMSP in the light was 62 ± 14% lower than the biological removal rate obtained in the dark. High spatial and temporal variability in the biological removal rates was observed for the dark treatments, as well as for its sen- sivity to solar radiation, with rates for light treatments varying from 29 to 81% of those in the dark. The DMSP concentration above which no further increase of the biological DMSP removal rate was observed was substantially lower in the light treatments (~30 nM) than in the dark treatments (>80 nM). UV-B radiation only accounted for a minor inhibitory effect (~15% of total inhibition), whereas UV-A and PAR (photosynthetically active radiation) both contributed ~42% of total inhibi- tion. Biological DMS removal under solar radiation was only ~40 ± 14% of the biological DMS removal in the dark. Under surface solar radiation, photochemical removal was always higher than the dark biological removal. Our results indicate therefore, that the DMSP and DMS dynamics in the oceanic surface waters are severely influenced by solar radiation due to the partial inhibition of the microbial consortia responsible for DMSP and DMS turnover.