论文部分内容阅读
基于2007—2009年的野外观测数据对戴家沟小流域降雨径流与农业非点源氮磷流失的时间序列变化关系及其特征进行研究。结果表明:2007—2009年,戴家沟小流域降雨量和径流量峰值变化一致,二者相关系数为0.904。总氮和总磷浓度变化趋势吻合,但总氮对降雨径流变化响应的灵敏度高于总磷;氮流失浓度受降雨径流变化影响显著,而磷流失则表现出逐年递增的趋势;氮磷比的变化特征与总氮浓度的变化特征一致,且与径流波动有良好的耦合关系。2007—2009年,戴家沟小流域降雨径流量累积百分比峰值出现时刻与总氮、总磷流失量累积百分比峰值出现时刻不吻合,表明流域农业非点源污染具有较大的随机性和分散性,二者没有严格的对应关系。
Based on the field observation data from 2007 to 2009, the relationship between rainfall runoff and the time series changes of non-point source nitrogen and phosphorus losses and their characteristics in Daijiagou watershed was studied. The results showed that the peak values of rainfall and runoff in the Daijiagou watershed fluctuated from 2007 to 2009 with a correlation coefficient of 0.904. The trend of total nitrogen and total phosphorus concentration was consistent, but the sensitivity of total nitrogen to rainfall runoff change was higher than that of total phosphorus. The concentration of nitrogen loss was significantly affected by rainfall runoff change, while the phosphorus loss showed an increasing trend year by year. The characteristics of variation are consistent with those of total nitrogen concentration, and have a good coupling relationship with runoff fluctuations. 2007-2009, Daijiagou watershed runoff cumulative peak cumulative moment of time and total nitrogen, total phosphorus cumulative peak cumulative moment does not coincide, indicating that agricultural non-point source pollution of agricultural waters with greater randomness and dispersion , There is no strict correspondence between the two.