文档介绍：A forest hydrology model for simulating the effect of stand management and climate change on forest water dynamics.
B. Seely, and J. P. Kimmins.
Introduction
With the expanding use of alternative silviculture systems in Canada and other timber producing countries and the growing threat of climate change, the need for ecosystem models that can cope with the changing ecosystem dynamics produced by such management and climate conditions has increased. One aspect of forest ecosystems particularly sensitive to these types of changes is the effect of soil moisture conditions on tree growth and other ecosystem processes. Several models of forest growth have included soil moisture or rainfall data as a parameter in the calculation of forest production, but few consider the effects of stand management on the dynamics of forest hydrology. Alterations in forest hydrology, whether induced by management or climate change, can have a significant impact on the partitioning of limited water resources among trees and understory species and ultimately on tree water stress and stand development.
Here we describe a two-dimensional forest hydrology model designed for simulating the hydrologic dynamics of a forest stand under a given set of climatic and vegatation conditions. The primary goal in model development was to produce a forest hydrology model which could be integrated with the forest ecosystem models FORCEE and FORECAST (Kimmins et al. 1997) for the purpose of simulating the effects of forest water dynamics on stand growth and development. In order to facilitate the use of the forest hydrology model in management applications the data requirements and calibrated parameters were kept to a minimum.
Model Description
The model described here called ForWaDy (Forest Water Dynamics) was constructed around the foundation of FORHYM, a general water balance model designed by Arp and Yin (1992) for the simulation of water fluxes through temperate forest ecosystems. The major d