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选用一株从碳酸盐岩表面分离的真菌,研究了实验条件下该真菌对方解石的风化作用。通过检测风化培养基与对照培养基的pH值、Ca2+浓度、挥发性代谢产物以及分析真菌-矿物相互作用过程中的矿物表面微观形态变化,研究该真菌对方解石的风化过程和作用机理。结果表明:在实验条件下该真菌对方解石具有较强的风化作用,风化培养基上清液中的Ca2+浓度分别是死菌对照的3.98倍和纯水对照的13.73倍;该真菌生长过程中会分泌有机酸和醇类等代谢产物,真菌和矿粉之间会形成菌体-矿物聚集体或复合体,促进方解石的风化。分析认为该真菌对方解石的风化作用包括机械破坏,代谢产物溶蚀、络合作用以及多种因素之间的协同作用。
A fungus isolated from the surface of carbonate rock was chosen to study the weathering effect of this fungus on calcite. The weathering process and mechanism of the fungi on calcite weathering were investigated by measuring the pH value, Ca2 + concentration, volatile metabolites in the culture medium and the control medium, and analyzing the microscopic morphological changes of the mineral surface during fungal-mineral interaction. The results showed that the fungi had stronger weathering effect on calcite under the experimental conditions. The concentration of Ca2 + in supernatant of weathered medium was 3.98 times that of dead bacteria control and 13.73 times of that of pure water control, respectively. During the growth of the fungus Secretion of organic acids and alcohols and other metabolites, fungi and mineral powder will form microbial - aggregates or complexes of minerals to promote calcite weathering. It is considered that the fungi ’s weathering effect on calcite includes mechanical damage, dissolution of metabolites, complexation and synergism among various factors.