关键词: 浮游植物, 核酮糖1,5-二磷酸羧化/氧化酶大亚基基因, 分子遗传多样性

Abstract: Based on the systematic analysis results of sulfur in acid sulfate soil(ASS)samples collected from their key distribution regions in Guangdong Province, the characteristics and succession of sulfur forms in ASS in different development processes were investigated. The results showed that the content of total sulfur was very high in ASS in the region, and the sulfur in ASS was mostly in inorganic form. The content of element S and organic S was relatively low. It could be found there was a good relative relationship between accumulation and succession of sulfur forms with development and formation of ASS. In acid sulfate paddy soils, sulfur forms was characterized by higher content in the jarosite([KFe₃(SO₄)₂(OH)₆])and lower content in the pyrite(FeS₂). The total S in surface horizon was much lower compared with potential ASS.More jarosite presented in oxic horizons with lower pH values and more pyrite presented in reduction horizon. For the sustainable utilization of ASS, the acid hazards should be considered as the key problem to be solved.

Key words: Phytoplankton, Ribulose-1, 5-bisphosphate carboxynase/oxygenase large subunit gene(rbcL), Molecular genetic diversity