春季解冻期棕壤坡面磷素迁移过程研究

发布时间：2018-06-28 00:17

本文选题：春季解冻期 + 人工降雨　；参考：《水土保持研究》2017年02期

【摘要】：春季解冻期土壤季节性冻融发生最为强烈,极易发生土壤侵蚀,也是磷素流失的关键时期。采用人工模拟降雨的方法,探究春季解冻期不同磷素背景值坡面产流产沙及磷素流失动态过程。结果表明:产流后14min内径流量和泥沙量均呈现较好的线性分布,径流相关系数为0.969,泥沙相关系数为0.936;14~18min内径流量缓慢增加,从18min开始一直到产流结束径流量基本保持在3 100ml/min,而泥沙则总体呈现先增大再减小的趋势;土壤背景值(APb)越高,径流、泥沙中磷浓度越高;径流中磷素流失比率均值APb20坡面最大,且随着背景值的增大呈减小趋势;而泥沙中磷素流失比率均值变化则与径流不同,APb40的坡面其流失比率最小,其他坡面差异较小;径流中磷素流失量与泥沙中磷素流失量呈线性关系,y=6.751x-0.628(R2=0.958)。
[Abstract]:Soil seasonal freezing and thawing occurred most intensely in spring thawing period, and it was easy to occur soil erosion, which was also the key period of phosphorus loss. The dynamic processes of runoff and sediment yield and phosphorus loss on slope during the thawing period in spring were studied by artificial rainfall simulation. The results showed that the internal diameter and sediment volume of 14min showed a good linear distribution after runoff production. The runoff correlation coefficient was 0.969, and the sediment correlation coefficient was 0.936 ~ 14 ~ 18min. From the beginning of 18min to the end of runoff, the runoff was basically maintained at 3 100 ml / min, while the sediment showed a trend of first increasing and then decreasing; the higher the soil background value (APB), the higher the phosphorus concentration in sediment, the higher the phosphorus loss ratio in runoff was. With the increase of background value, the loss ratio of phosphorus in sediment decreased, while the loss ratio of phosphorus in sediment was the smallest in the slope with different runoff, and the difference in other slopes was small. There is a linear relationship between phosphorus loss in runoff and phosphorus loss in sediment.
【作者单位】：沈阳农业大学水利学院;
【基金】：国家自然科学基金(41471225) 辽宁省农业领域青年科技创新人才培养计划(2014054) 辽宁省高等学校优秀人才支持计划(LJQ2013074)
【分类号】：S157.1

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