环境因子对巢湖沉积物中NH4+释放的影响

目的]为揭示环境因子对巢湖沉积物-水界面营养盐交换的影响机制。方法]在实验室控制条件下,研究各环境因子(上覆水浓度、温度、pH值、DO条件)对巢湖沉积物湿样中NH4+释放的影响。结果]随着温度的上升和上覆水NH4+浓度的降低,沉积物中NH4+释放量显著增加;pH值对NH4+释放的影响比较复杂;沉积物中NH4+最大释放量在厌氧条件下是好氧条件下的6倍左右。结论]该研究为"引江济巢"工程中巢湖的环境管理提供了一定的理论依据。

Effects of Environmental Factors on NH+4 Release in Sediment from Chaohu Lake

Objective] The aim of the research was to reveal the influence mechanism of sediment-water exchange of nutrients in Chaohu Lake.Method] The effects of environmental factors(overlying water,temperature,pH and dissolved oxygen concentration) on NH+4 release in sediment from Chaohu Lake were studied under controlled laboratory conditions.Results] With the rising of temperature and the decrease of NH+4 concentration in overlying water,NH+4 released from sediment increased significantly.pH had a great effect on NH+4 release with a complicated mechanism.The largest release amount of NH+4 under anaerobic condition was about 6 times as much as that under aerobic condition.Conclusion] This research would provide theoretical support for environmental management of Chaohu Lake in the project of leading water from the Yangtze River to Chaohu Lake.