Rainfall characteristics under canopy of main tree species in loess area
LI Wei-；Tu-Xin-Xiao-；Yue-Yong-Jie
Key Lab.of Soil & Water Conservation and Desertification Combating of Education Ministry,College of Soil and Water Conservation,Beijing Forestry University,100083,Beijing,China
Abstract：With the simulated rainfall,the rainfall characteristics under canopy of the mainly tree species in loess area was studied applying the color-spot method.Combining software,such as Auto CAD and Excel,within the stand class grade of 0.1mm,the rainfall characteristics of the trees under canopy was analyzed,and the rainfall kinetic energy in and out of forest was sludced comparably.The results showed that,1) Under varied rain intensities,the observed median diameter of canopy raindrops are kept in a range stably.The rainfall characteristics under canopy won't be affected by the rain intensity of glade.2) It is probable to make a distortion by using gaussian distribution function and class chi-square distribution function to describe and analysis the rainfall characteristics under canopy,better math form should be found to figure it.3) The distribution chart of diameter-volume of canopy raindrop is a double-peak curve,which showed that Best function is unable to make a precise description of the large rain drops as well,while polynomial function is better than it.4) The descending order of kinetic energy of tree species per liter as the follows: Platycladus orientalis(28.18 J),Pinus tabulaeformis(26.74 J),Acer truncatum Bunge (25.75 J) and Robinia pseudoacacia Linn(20.07 J).And the results also can be used to evaluate whether vegetation canopy strengthens the rainfall energy,under the condition of abundant rainfall.
李维；余新晓；岳永杰. 黄土地区主要树种的林冠降雨特征分析[J]. 中国水土保持科学, 2009, 7(2): 42-47.
LI Wei-；Tu-Xin-Xiao-；Yue-Yong-Jie. Rainfall characteristics under canopy of main tree species in loess area. SSWCC, 2009, 7(2): 42-47.
2009, Vol. 7 
