雨强和坡度对裸地径流颗粒物及磷素流失的影响

发布时间：2018-03-30 04:05

本文选题：降雨雨强　切入点：坡度　出处：《中国环境科学》2016年10期

【摘要】：采用人工模拟降雨的方法,研究了不同雨强(0~100mm/h)和坡度(0°~10°)条件下,北方砂壤土裸地降雨径流中颗粒物(SS)、总磷(TP)、颗粒态磷(PP)的流失量及径流污染物之间的相关关系,并分析了雨强和坡度对污染物流失量的影响.研究结果表明,雨强和坡度越大,SS和TP流失量越大;径流中SS与TP、TP与PP的单位面积流失量呈显著线性相关关系(R~20.946);在实验条件范围内,雨强对颗粒物及磷素流失量的影响比坡度更显著;径流中颗粒物及磷素单位面积流失量与雨强、坡度及场降雨径流总量之间均有明显的线性关系,相关系数大于0.911,由于0°裸地和有坡度裸地的下渗及产流情况差异较大,在模拟雨强和坡度对颗粒物及磷素流失量影响时需分别考虑.结果可为我国北方砂壤土裸地径流中颗粒物及磷素单位面积流失量的估算提供计算方法和科学依据.
[Abstract]:Using artificial rainfall simulation method, the correlation between the amount of particulate matter (SSN), total phosphorus (TPN), particulate phosphorus (PPP) and runoff pollutants in rainfall runoff of sandy loam soil in North China was studied under different rainfall intensity (100 mm / h) and slope (0 掳/ 10 掳). The effects of rain intensity and slope on the loss of pollutants were analyzed. The results showed that the larger the rain intensity and slope, the greater the loss of SS and TP. There was a significant linear correlation between SS and TPN TP and PP per unit area loss in runoff. In the range of experimental conditions, the effect of rain intensity on the loss of particulate matter and phosphorus was more significant than that of slope, and the loss of particulate matter and phosphorus per unit area in runoff was related to rainfall intensity. There is an obvious linear relationship between the slope and the total rainfall runoff, and the correlation coefficient is greater than 0.911. Because of the difference of infiltration and runoff production between the 0 掳bare land and the slope bare land, The effects of rain intensity and slope on the amount of particulate matter and phosphorus loss should be considered separately. The results can provide a calculation method and scientific basis for estimating the loss of particulate matter and phosphorus per unit area in bare land runoff of sandy loam soil in northern China.
【作者单位】：北京林业大学环境科学与工程学院水体污染源控制技术北京市重点实验室;北京未来科技发展集团有限公司;
【分类号】：X144;;S157.1

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