摘要
湖泊中方解石的沉积是环境变迁的重要记录。为了解译这些档案,有必要了解方解石的起源。普遍认为方解石的沉淀能被细菌和藻类所诱导。然而,详细的机制仍不清楚。本综述概括了已知的在方解石沉淀和自养微型浮游生物之间的相互作用。我们考虑了来自野外和实验室研究两方面的发现。野外研究显示,在贫营养湖中方解石的沉淀与微型蓝细菌的繁盛有密切的关系。室内实验使微藻类诱导沉淀的机制清晰化了。实验也显示由微型蓝细菌诱导的沉淀受到各种不同因素的影响,包括无机碳的吸收和细胞壁结构。最近的研究指出还必须考虑环境条件如湖水组成的影响。我们得出结论,需要原位观察受控条件下在微型浮游生物细胞上的沉淀过程以改善我们对矿物细菌相互作用的理解。
Deposits of lacustrine calcite are important records of environmental changes.In order to interpret these archives,knowledge about the origin of the calcite is essential.It has been accepted that calcite precipitation can be induced by bacteria and algae.However,the detailed mechanisms are still unclear.This review summarizes what is known about the interactions between calcite precipitation and the autotrophic picoplankton.We consider findings from both field and laboratory studies.Field studies show that calcite precipitation in oligotrophic Jakes is strongly linked with picocyanobacteria blooms.Laboratory experiments led to the formulation of the mechanism of precipitation induced by microalga.Experiments also showed that precipitation induced by picocyanobacteria is influenced by various factors including the uptake of inorganic carbon and the structure of the cell walls.Recent studies indicate that the influence of environmental conditions like the composition of lake water has to be taken into account as well.We conclude that in situ observations of precipitation processes at picoplankton cells under controlled conditions are needed to improve our understanding of mineral bacteria interaction.
