Improving the Vegetation Dynamic Simulation in a Land Surface Model by Using a Statistical-dynamic Canopy Interception Scheme

摘要

Canopy interception of incident precipitation,as a critical component of a forest’s water budget,can affect the amount of water available to the soil,and ultimately vegetation distribution and function.In this paper,a statistical-dynamic approach based on leaf area index and statistical canopy interception is used to parameterize the canopy interception process.The statistical-dynamic canopy interception scheme is implemented into the Community Land Model with dynamic global vegetation model(CLM-DGVM)to improve its dynamic vegetation simulation.The simulation for continental China by the land surface model with the new canopy interception scheme shows that the new one reasonably represents the precipitation intercepted by the canopy.Moreover,the new scheme enhances the water availability in the root zone for vegetation growth,especially in the densely vegetated and semi-arid areas,and improves the model’s performance of potential vegetation simulation.