Title: Effect of decomposition of Potamogeton malaianus on accumulation and release of carbon,nitrogen and phosphorus in water and sediment at early spring
Abstract: Through laboratory simulation condition of early spring temperature(17 ℃),effects of decomposing process of submerged plant Potamogeton malaianus Miq.on its release of organic carbon,total nitrogen and total phosphorus,on contents of organic carbon,total nitrogen and total phosphorus in water and sediment and on contents of ammonium nitrogen and nitrate nitrogen in water were studied,and meanwhile emission status of N2and N2O in water were analyzed.The results show that during the experimental period of 70 d,P.malaianus is decayed quickly,its loss weight rate reaches 86.92% until the end of experiment,and its amounts of organic carbon,total nitrogen and total phosphorus decrease by88.51%,88.93% and 86.63% as compared to those at the beginning of experiment,respectively.At the end of experiment,contents of organic carbon,total nitrogen and total phosphorus in sediment increase by 5.56%,17.06% and 2.17% as compared to those at the beginning of experiment,respectively.During the decomposing process of P.malaianus,both dissolved oxygen content and oxidation-reduction potential in water decrease obviously as compared to the control with the trend of decreasing quickly at the beginning of experiment and then increasing gradually and becoming stable.Contents of organic carbon,total nitrogen,total phosphorus and ammonium nitrogen in water increase greatly as compared to the control with the trend of increasing quickly at the beginning of experiment and then decreasing gradually and becoming stable.While content of nitrate nitrogen in water appears the trend of firstly decreasing and then increasing again decreasing.Emission fluxes of N2and N2O in water increase obviously as compared to the control and reach the maximum in the middle of experiment period.It is suggested that with prolonging of time,most phosphorus in water released from P.malaianus run into sediment,while a part of nitrogen runs into sediment and a part of nitrogen runs out of water as the form of gas(N2and N2O).
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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