EFFECT OF SEAWATER pH ON BIOLOGICAL PRODUCTION OF DIMETHYLATED SULFUR COMPOUNDS IN EMILIANIA HUXLEYI AND SKELETONEMA COSTATUM
As an anti-greenhouse gas,dimethyl sulfide(DMS),plays an important role in the marine sulfur cycle.At present,the impact of ocean acidification on DMS biological production remains controversial.An acidification simulation culture experiment of the common algae species Emiliania huxleyi and Skeletonema costatum was conducted,in which the effects of pH changes in seawater on the biological production of DMS,dimethylsulfoniopropionate(DMSP),and dimethyl sulfoxide(DMSO)were analyzed.Results show that the cell abundance,specific growth rate,DMS,DMSP,DMSO,unicellular DMS,unicellular DMSP,unicellular DMSO of Emiliania huxleyi in pH 7.9 and pH 7.7 groups were significantly lower than those in pH 8.1 group in 4 to 10 days(P＜0.05).DMS decreased by 22.4％and 29.3％,DMSP decreased by 10.0％and 22.6％,DMSO decreased by 23.5％and 29.6％,respectively.No significant differences were observed in the biomass and dimethylated sulfur compounds of Skeletonema costatum under the three pH conditions(P＞0.05).The Pearson correlation analysis revealed a significant correlation between the biomass and dimethylated sulfur compounds of Emiliania huxleyi and Skeletonema costatum(P＜0.05);and the correlation between the dimethylated sulfur compounds of Emiliania huxleyi was weaker than that of Skeletonema costatum.The decrease of seawater pH had a greater effect on the growth and release of dimethylated sulfur compounds in Emiliania huxleyi,and had a smaller effect on Skeletonema costatum.This study is helpful to further understand the variation in the trend of marine sulfur emissions under the background of global climate change.
万方数据
维普
