Seasonal export of phosphorus from a lowland catchment: upper River Cherwell in Oxfordshire, England.
Seasonal export of phosphorus from a lowland catchment: upper River Cherwell in Oxfordshire, England.
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DOI：
10.1016/s0048-9697(00)00820-2
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发表时间：
2001-03
期刊：
影响因子：
--
通讯作者：
Linda May;W. House;M. Bowes;Jim McEvoy
中科院分区：
文献类型：
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作者：
Linda May;W. House;M. Bowes;Jim McEvoy
从一个低地集水区，在英格兰南部的彻韦尔河，磷的出口进行了为期1年的测量。结果描述了总磷浓度的水和河流排放量在4天的时间间隔。这些被用来估计从集水区输出的总磷的负荷。这些年度负荷进行了比较，估计从污水输入和扩散输入计算的土地覆盖数据，分配磷出口系数为特定的土地利用的出口。该方法进一步发展，以检查磷出口的季节性变化，预测每月的损失，使用相对于特定月份的相对水力径流归一化的年度出口系数。结果表明，总出口量有很强的季节依赖性，春季至初秋河流系统中磷的保留和冬季储存物质的释放。即使主要的土地覆盖物出口增加了50%，处理过的污水出口也有类似的增加，这种模式仍然存在。
The export of phosphorus from a lowland catchment, the River Cherwell in southern England, was measured over a period of 1 year. The results describe total phosphorus concentrations in the water and river discharge at 4-day intervals. These were used to estimate the load of total phosphorus exported from the catchment. These annual loads were compared with exports estimated from sewage inputs and diffuse inputs calculated from land-coverage data, with assigned phosphorus export coefficients for particular land uses. The method was further developed to examine seasonal changes in phosphorus exports by predicting monthly losses using annual export coefficients normalised with respect to the relative hydraulic runoff for a particular month. The results show a strong seasonal dependence of total exports, with retention of phosphorus in the river system in the spring to early autumn and release of stored material during the winter. This pattern remained true, even with 50% increase in the main land-cover export and a similar increase in treated sewage exports.