北京林业大学学报2017，Vol.39Issue(5)：82-88,7.DOI:10.13332/j.1000-1522.20160305
高羊茅草地地表径流系数影响因素研究
Study on the factors influencing surface runoff coefficient in Festuca arundinacea grassland
摘要
Abstract
Festuca arundinacea as a kind of typical grass in northern China, it has the advantage of storing and infiltrating rain water. In order to research the runoff of F. arundinacea grassland, we studied the changing process of runoff coefficient under different coverage ( bare land, 60%, 90%) and varied rainfall intensities ( 30, 60, 90 mm/hour ) in F. arundinacea grassland through artificial simulated rainfall experiments. And we also studied its relationship with different influencing factors. Taking bare land as control, we studied the runoff coefficient reduction rate of F. arundinacea grassland under varied experimental conditions. The results showed that:1) The initial runoff time of F. arundinacea grassland decreased with the increase of rainfall intensity, and it prolonged with the increase of coverage. Simultaneously, the greater the rainfall intensity was, the smaller range the runoff coefficient reduction rate became. And the greater the coverage was, the more obvious the grassland delayed the initial runoff time. 2) The runoff coefficient of F. arundinacea grassland and bare land both rapidly increased and then tended to be stable with the increase of rainfall time. After simulation, it was found that the runoff coefficient all showed a logarithmic function with rainfall time. 3 ) Runoff coefficient of F. rundinacea grassland decreased with the increase of coverage,and it increased with the increase of rainfall intensity. Also, the lower the coverage was, the more significant the rainfall intensity affected runoff coefficient. But the larger the coverage was, the less significant the rainfall intensity affected runoff coefficient. 4 ) The ability of F. arundinacea grassland in reducing runoff coefficient was limited. With the increase of rainfall intensity, runoff coefficient reduction rates of two kinds of coverage grasslands were more close. When the rainfall intensities were 30, 60, 90 mm/hour, the differences in runoff coefficient reduction rate between the 60% and 90% coverage grassland were 25%, 24%, 23%, respectively. 5 ) The regression equation of the runoff coefficient of F. arundinacea with rainfall intensity, coverage and rainfall time was established under experimental conditions. After verification, the equation could be applied to predict the runoff coefficient of F. arundinacea grassland under the experimental conditions.关键词
人工模拟降雨/覆盖度/降雨强度/径流系数Key words
simulating rainfall/coverage/rainfall intensity/runoff coefficient分类
农业科技引用本文复制引用
魏小燕,毕华兴,霍云梅,肖聪颖,杨晓琪..高羊茅草地地表径流系数影响因素研究[J].北京林业大学学报,2017,39(5):82-88,7.基金项目
国家水体污染控制与治理重大专项(2013ZX07304-001)、科技创新服务能力建设-协同创新中心- 林果业生态环境功能提升协同创新中心(PXM2016_014207_000083). （2013ZX07304-001）
