盐度对金鱼藻除氮作用的影响

目的]研究了盐度对金鱼藻生长及除氮作用的影响。方法]以采自盐碱地水湾的沉水植物金鱼藻为试验材料，试验设5个盐度（S）梯度：0．2、2．0、4．0、6．0、7．5，经过30d的连续培养和4d的除氮试验，观察金鱼藻叶茎色泽、抽芽与凋落等生长变化状况。结果]金鱼藻在水环境盐度S≤4．0时可正常生长，但当盐度S≥6．0时，其生长受到抑制。培养液盐度对金鱼藻去除氨态氮的作用具有显著影响，除氨氮率随盐度的升高而降低，当盐度S〉4．0时，金鱼藻基本失去除氨氮能力。金鱼藻具有较强的吸收硝态氮的能力，各盐度组对硝态氮的去除率均高于对氨氮的去除率。金鱼藻还具有良好的去除无机氮的能力。结论]当养殖用水的盐度S〈4．0时，采用金鱼藻可有效降低水环境中的三态氮。

Effect of Salinities on the Nitrogen Removal Effect of Ceratophyllum demersum

Objective] The purpose was to research the salinity on the growth and nitrogen removal of Ceratophyllum demersum.Method] With the submerged plant C.demersum selected from the water bay of alkaline land,5 salinity gradients of 0.2,2.0,4.0,6.0,7.5 were set up to conduct the continuous cultivation test for 30 d and nitrogen removal test for 4 d resp.and the growing status such as leaf-stem color,shoot forth and wilting of C.demersum was investigated.Result] C.demersum grew well when the salinity was equal o...