氮磷浓度变化下粉绿狐尾藻的生长规律研究

The Growth Law of Green Myriophyllum verticillatum Under Different Concentrations of Nitrogen and Phosphorus

旨在为采用生物方法净化养殖废水,管理植物培养模式提供理论依据。以氯化铵(NH4Cl)、硝酸钾(KNO3)、磷酸二氢钾(KH2PO4)提供氨氮、硝氮、总磷,采用室外完全随机试验,研究粉绿狐尾藻在氨氮、硝氮、总磷三因素作用下的生长规律。培养30天的粉绿狐尾藻植株长度和鲜重随氨氮浓度的增加先升高后降低,氨氮浓度为25 mg/L时最适宜其生长。硝氮浓度从5 mg/L变化到35 mg/L时,其鲜重和长度总体呈现先增后减规律,最适宜其生长的硝氮浓度为15 mg/L。总磷浓度在5 mg/L至35 mg/L变化时,其生长状况与浓度呈正相关,适宜其生长的浓度阈值仍需进一步设计试验研究。粉绿狐尾藻生长受氨氮、总磷浓度变化影响显著,受硝氮浓度变化影响较前两个因素小。研究成果可为利用粉绿狐尾藻净化污水中氮磷元素、管理维护粉绿狐尾藻生态净水系统提供理论依据。

The aim is to provide a theoretical basis for purifying aquaculture wastewater by biological methods and managing plant cultivation mode. Ammonium chloride(NH4 Cl), potassium nitrate(KNO3), and potassium dihydrogen phosphate(KH2 PO4) were used to provide ammonia nitrogen, nitrate nitrogen, and total phosphorus.A completely random outdoor experiment was conducted. The growth law of green Myriophyllum verticillatum under the variation of the three factors of ammonia nitrogen, nitrate nitrogen and total phosphorus was studied.The length and fresh weight of green Myriophyllum verticillatum after 30 days increased first and then decreased with the increase of ammonia nitrogen concentration. The ammonia nitrogen concentration of 25 mg/L was the most suitable concentration for the growth. When the concentration of nitrate changed from 5 mg/L to35 mg/L, its fresh weight and length generally increased first and then decreased. The most suitable nitrate concentrationforgrowthwas 15 mg/L.Whenthetotalphosphorusconcentrationchangedfrom 5 mg/Lto35 mg/L,its growth status was positively correlated with the concentration, and the concentration threshold suitable for its growth was unknown, needing to be further studied. The growth of green Myriophyllum verticillatum was significantly affected by the changes of ammonia nitrogen and total phosphorus concentration, and was less affected by the changes of nitrate nitrogen concentration compared to the first two factors. The research results can provide a theoretical basis for purifying the wastewater in the sewage, managing and maintaining the ecological water purification system of green Myriophyllum verticillatum.