池塘生态系基质C/N比对游离细菌群落生长和有机N矿化作用的影响

本文研究了向高产鱼池中人工添加有机C（葡萄糖）和有机N（甘氨酸）对水中游离细菌生长及其分解矿化有机N的影响。研究结果表明，向池塘水中添加有机C促进了细菌生长和细菌对N素的吸收；而添加有机N对细菌生长的影响不明显，但增强了有机N的矿化作用。在池塘水营养条件下，溶解有机C限制了细菌的生长，细菌在鱼池生态系统N循环中起着有机N分解者的作用。

EFFECTS OF SUBSTRATE C/N RATIO ON GROWTH OF PLANKTONIC BACTERIAL ASSEMBLAGE AND THEIR N MINERALIZATION IN FISH POND ECOSYSTEM

The effects of the nutritional composition of the substrate on the bacterial growth and their N mineralization after adding organic carbon (glucose) and organic nitrogen (glycine) to the experimental fish pond were investigated in this paper. The study showed that the growth rate of bacterial assemblage and their uptake of N were enhanced by enriching the water with organic carbon. On the other hand, the growth rate of bacterial assemblage was not significantly increased, while the N mineralization was increased by enriching the water with organic nitrogen. The nutritional status of fish pond water implied that the bacterial growth was limited by the content of DOC in the substrate. The bacterial assemblage in water of the experimental fish pond acted as a decomposer of organic nitrogen in the process of nitrogen cycling within the fish pond ecosystem.