海洋中β-二甲基巯基丙酸内盐降解过程的研究进展

Research Progress on the Degradation Process of the Dimethylsulfoniopropionate in Ocean

二甲基硫(DMS)是海水中一种最重要的、含量最丰富的还原态挥发性生源有机硫化物,前体β-二甲基巯基丙酸内盐(DMSP)的降解过程受各种因素影响。其中主要包括温度、DMSP的浓度、氧气、盐度、酸度、颗粒粒度、藻类生长期、季节变化、氧化压力、抑制剂等。它们均与DMSP降解速率呈一定的函数关系,并对DMSP的降解产物产生影响。藻类是DMSP的主要来源,因此着重讨论了温度、盐度、酸度等对不同浮游植物细胞内DMSP与DMS生物生产和转化过程的影响。结合海洋硫循环的研究现状和海洋化学发展的趋势,探究了用颗粒态DMSP与Chla的比率来量化碳和硫通量的方法及DMSP裂解酶活性的检验技术。大气中CO2压力持续增加导致的海洋酸化对藻类中DMSP降解过程的影响也是进一步研究的重点。

Dimethylsulfide （DMS） is one of the most important and abundant biogenic volatile organic sul- fides. The degradation process of its precursor, dimethylsulfoniopropionate （DMSP）, has been received widespread attention. This paper reviews the various factors affecting the degradation process of DMSP, including temperature, concentrations of DMSP, oxygen, salinity, pH, particle size, algae growth phase, seasonal changes, oxidative stress, inhibitors, etc. These factors showed a certain functional relationship with DMSP degradation rate and impacted the degradation products of DMSP. The algae is the main source of DMSP, therefore the effects of temperature, salinity, acidity, etc on the biological production and transformation process of DMSP and DMS in different phytoplankton cells were emphatically discussed. Combined with the research status of marine sulfur cycle and the development trend of marine chemistry, the method of using the ratio of particulate DMSP and Chl-a to quantify the flux of carbon and sulfur, and the inspection technology of DMSP lyase activity were explored. The impacts of ocean acidification caused by the increased atmospheric CO2 pressure on the degradation process of the algae DMSP would also be the focus of further studies.