Phosphorus dynamics and productivity in a sewage-impacted lowland chalk stream
Phosphorus dynamics and productivity in a sewage-impacted lowland chalk stream
复制标题
受污水影响的低地白垩溪流中的磷动态和生产力
DOI：
10.1016/j.jhydrol.2007.11.036
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发表时间：
2008
影响因子：
6.4
通讯作者：
C. Neal
中科院分区：
文献类型：
--
作者：
E. Palmer;H. Jarvie;Richard J. Williams;R. Mortimer;M. Loewenthal;C. Neal
从2004年1月到2006年11月，每小时对肯尼特河进行原位磷、电导率、浊度、溶解氧、pH值和叶绿素测量，肯尼特河位于污水出水口下游2公里处。过量二氧化碳压力（EpCO2）是通过连续的pH值和碱度测量来计算的。epco2和溶解氧被用来估计光合作用和呼吸的速率。这些参数与流量、水温和太阳辐射一起进行了研究，以探索磷动态和流内生产力的控制因素。研究了磷浓度的日、事件和季节变化规律。日变化和季节变化似乎与上游污水处理厂有关。事件模式与高流量时期相吻合，并归因于扩散源。叶绿素的表现与磷浓度无关，并恢复到光合作用速率之前的基线水平。这表明，在研究期间，流内生产力主要由水生植物而非浮游植物控制。
Hourly in situ phosphorus, conductivity, turbidity, dissolved oxygen, pH, and chlorophyll measurements were collected from January 2004 to November 2006 for the River Kennet, 2km downstream of a sewage effluent inlet. Excess carbon dioxide pressure (EpCO2) was calculated from continuous pH and spot alkalinity measurements. EpCO2and dissolved oxygen were used to estimate rates of photosynthesis and respiration. These parameters were examined alongside flow, water temperature and solar radiation to explore controls on phosphorus dynamics and in-stream productivity. Diurnal, event and seasonal patterns were observed in phosphorus concentrations. The diurnal and seasonal variations appeared to be related to the upstream sewage treatment works. The event patterns coincided with periods of high flow, and were attributed to diffuse sources. Chlorophyll behaved independently of phosphorus concentration and returned to baseline levels before photosynthesis rate. This indicated that, during the period of study, in-stream productivity was primarily controlled by aquatic plants other than phytoplankton.