Effect of Phosphorus Uptake by Ceratophyllum Demersum and its Uptake Kinetics in Waters with High Phosphorus Concentrations
With static laboratory experiments,Ceratophyllum demersum was selected as the research object to investigate its phosphorus (P) uptake abilities for different P levels of inorganic and organic phosphorus.Phosphorus uptake kinetics was also studied by ion depletion method.The results show that the average daily P accumulation in Ceratophyllum demersum increased significantly during the 30 days experimental period.P uptake ability by Ceratophyllum demersum in different inorganic P (KH2PO4) levels was obviously enhanced with the increasing phosphorus concentration.Moreover,Ceratophyllum demersum can uptake and utilize β-glycerophosphate as P source no matter whether the systems were sterilized or not,which indicates there is no microorganisms dependence in the uptake of β-glycerophosphate by Ceratophyllum demersum,but for phytic acid,almost no P uptake was detected.The uptake ability of organic P by Ceratophyllum demersum was much higher than that of inorganic P at the P level of 10 mg/L.The P uptake kinetics parameters were calculated according to the experimental data.The maximum absorption rate(Imax) of P by Ceratophyllum demersum is 54.94 μg P/g·h (Dry Weight) and the Michaelis constant(Km) is 1.754 mg/L,which shows that the maximum absorption rate of P by Ceratophyllum demersum is relatively low compared with other wetland plants and the affinity of P with Ceratophyllum demersum is rather weak.
Ceratophyllum demersum phosphorus organic phosphorus uptake kinetics
Liu Jingjing Li Min
College of Environmental Science and Engineering,Beijing Forestry University,Beijing 100083,China
国内会议
天津
英文
210-218
2012-09-26（万方平台首次上网日期，不代表论文的发表时间）