摘要
为研究风浪扰动对城市河道型湖泊沉积物磷释放的影响,该文以西安市雁鸣湖沉积物为研究对象,进行了室内振荡器模拟风浪的试验。试验结果表明,水体中各形态磷(TP、DTP、DOP、PP、SRP)含量总体趋势均随扰动频率的增大而增加,随扰动持续时间而减少,变化趋势最明显的是TP和PP含量。上覆水中PP含量最多,占磷总量的57.1%~93.9%,SRP含量最少,仅占1.5%~4.9%,PP占TP的百分比随着振荡频率的增大而增加,相反,DTP和DOP占比均随振荡频率的增大而减少,SRP占TP的百分比随着振荡频率的增大没有明显的变化趋势。此外,扰动频率越大,TP和PP的吸附/解吸达到平衡所用的时间越长,而对其他3种溶解态磷的吸附/解吸平衡时间影响较小。
In order to study the effect of wind and wave disturbance on the release of phosphorus from urban river-type lake sediments,this paper takes the sediments of Yanming Lake in Xi’an City as the research object,and conducts an indoor oscillator to simulate wind and waves.The test results show that the overall trend of the content of various forms of phosphorus(TP,DTP,DOP,PP,SRP)in the water body increases with the increase of the disturbance frequency and decreases with the disturbance duration.The most obvious change trend is the content of TP and PP.The content of PP in the overlying water is the largest,accounting for 57.1%~93.9%of the total phosphorus,and the content of SRP is the least,accounting for only 1.5%~4.9%.The percentage of PP in TP increases with the increase of the oscillation frequency.On the contrary,DTP and DOP,these proportions decreased with the increase of oscillation frequency,and the percentage of SRP in TP had no obvious trend of change with the increase of oscillation frequency.In addition,the larger the perturbation frequency,the longer it takes for the adsorption/desorption of TP and PP to reach equilibrium,while it has less effect on the adsorption/desorption equilibrium time of the other three dissolved phosphorus.
作者
杨智婷
冯民权
YANG Zhiting;FENG Minquan(State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi’an University of Technology,Xi’an 710048,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2022年第S01期104-110,共7页
Environmental Science & Technology
基金
国家自然科学基金资助项目(51679191)
陕西省自然科学基础研究计划重点项目(2019JZ-42)
关键词
湖泊沉积物
扰动频率
磷释放
平衡时间
lake sediment
disturbance frequency
phosphorus release
equilibrium time
