中文摘要：

利用NCAR—CLM4．0模式，通过有无植被冠层截留的试验对比分析，讨论了植被冠层截留对全球陆面水分和能量平衡产生的潜在影响。结果表明：就全球水分平衡而言，不考虑植被冠层截留时，全球平均土壤总含水量、表面径流和次表面径流增加，蒸散发减少。空间分布特征表明，低纬地区各水分平衡分量全年维持较高的差值分布，并随季节变化沿赤道南北振荡；北半球中高纬高值区有春季扩张、夏季极盛、秋冬季撤退的趋势。冠层截留消失后冠层蒸发的消失是蒸散发减弱的主要原因。对于能量平衡而言，不考虑冠层截留时，全球感热通量增加，冠层感热的增加明显大于地面感热的减少；潜热减少。此外，不同植被类型对不考虑冠层截留后产生的响应存在明显差异。

英文摘要：

Impacts of canopy interception on land surface water and energy balance are investigated through contrast analysis of numerical experiments with or without canopy interception by using the NCAR Community Land Model（CLM4.0）. It is shown that when canopy interception isn＇t taken into account, the total water content of soil, surface runoff and sub-surface runoff increase, while the evapotranspiration decreases. Spatial distribution indicates that a high difference distribution exists between the two experiments at low latitudes which has north-south oscillation with the season variation; the high value area expands in spring, becomes heyday in summer, and retreats in autumn and winter at northern mid-high latitudes. The main reason of the decrease of evapotranspiration is that the canopy evaporation disappears without canopy interception. For the energy balance, it is shown that without canopy interception, sensible heat flux increases, while latent flux decreases. The value of increase in the canopy sensible heat is higher than that of reduction in the surface sensible heat. The spatial distribution of energy balance is similar to the water balance components. In addition, there are sia-nificant differences among the response of different vegetation types when the canopy interception is neglected.