【摘要】 根据2008年4月实测数据,以三峡库区重庆缙云山4种典型林分(马尾松纯林、马尾松阔叶混交林、常绿阔叶林和楠竹林)为研究对象,并以农耕地作对照,在野外径流小区实验的基础上,通过曼宁公式,对重庆缙云山林地坡面糙率系数n值进行研究。结果表明:地表糙率系数n值介于0.007 9~0.270 4之间,其中,马尾松纯林的糙率系数n值最小,马尾松阔叶混交林的糙率系数n值最大,大小排序为马尾松阔叶混交林>阔叶林>楠竹林>马尾松纯林;糙率系数n(y)与枯落物厚度(x)的关系为y=0.020 5e0.543 6x,R2=0.923 7;地表水分渗透量(y)随着糙率系数n(x)增加而增大,其关系式为y=37.25lnx+188.47,R2=0.778 2。更多还原

【Abstract】 Surface roughness coefficients on the slope of forestland in Jinyun mountain of Chongqing by using the Manning Formula are conducted based on the measured field experiments data in 4 typical forests(Pinus massoniana,mixed with Pinus massoniana and broadleaf trees,broadleaf forest and Phyllostachys pubescens),compared to crop-land,in Jinyun mountain,Chongqing City of the Three Gorges Reservoir Area in April 2008.The results show that the values n of the surface roughness coefficient vary from 0.007 9 to 0.270 4.The value n of Pinus massoniana is minimum and the value n of the mixed with Pinus massoniana and broadleaf trees is maximum.The descending order of surface roughness coefficient of 4 typical forests is as follows: mixed with Pinus massoniana and broadleaf trees,broadleaf forest,Phyllostachys pubescens,Pinus massoniana.The relationships between surface roughness coefficient and litter depth is shown as linear relationship,the formula of surface roughness coefficient(y) and litter depth(x) is: y=0.020 5e0.543 6x,R2 is 0.923 7 respectively,and there is a logarithmic relationship between surface roughness coefficient(x) and infiltration capacity of surface water(y),the formula is: y=37.25lnx+188.47,R2 is 0.778 2.The infiltration capacity of surface water increases with the increase of surface roughness coefficient.更多还原