【摘要】 随着养殖进程，底质中NH＋4-N、S2-和异养细菌的含量一直呈升高之势，其变化主要受控于底质中有机质含量的多寡，水温只是其影响因素之一。虾池底质中NH＋4-N、S2-和异养细菌的含量分布：沟泥＞滩泥＞池水，异养细菌和NH＋4-N、S2-含量呈正相关。文中对改善虾池底质环境，降低底质中NH＋4N、S2-和异养细菌的一些措施进行了探讨更多还原

【Abstract】 Variations of NH+4-N,S2- and heterotrophic bacterium contents in the substrate of four shrimp ponds and their correlations are presented in the paper’ The results show that an increasing trend in their contents in the course of shrimp culture is resulted from the increase of deposits of organic matters such as the excrement of shrimp, the residual diets of shrimps and the fragments of organisms, etc, on the bottom of pond. Their variations are mainly under the control of organic contents in the substrate. Water temperature is only one of influential factors. The contents decrease in orders from ditch mud to flat mud to pond water.The number of heterotrophic bacterium in the substrate show a positive correlation with the contents of NH+4-N and S2-. In addition, some measures for imprOving substrate environ ment and reducing the contents of NH+4-N,S2- and heterotrophic bacterium in the substrate are discussed.更多还原