森林生态系统模型PnET及其应用

Forest Ecosystem Model PnET and Its Applications

森林生态系统模型已经成为一门新兴的科学,可以为森林资源的管理利用、森林最大收益的获取提供科学依据。PnET模型是美国复杂系统研究中心(Complex System Research Center)开发研制的,最初是为了模拟森林生态系统碳水平衡而创建,目前该模型可以模拟完整的氮循环过程。PnET模型已经在美洲、欧洲以及亚洲的一些地区得到了验证和运用,可用于森林乃至陆地生态系统的模拟。PnET模型可用来分析森林林木生长规律,不同土壤类型及气候条件对森林生态系统碳氮通量变化的影响;还可用于估算森林生态系统最大生产潜力,对生长在不利条件以及地区的林木生长进行预测等。该模型对可持续林业的发展具有积极的指导作用。

Forest ecosystem model is an effective tool for providing decision on forest resource management. PnET was established on the framework of interdisciplinary studies by the Complex Systems Research Center, USA. Though primarily a temperate forest canopy model, work is currently underway to generalize PnET and produce a simple, alternative model applicable to simulate carbon, water and nitrogen flux for all terrestrial ecosystem types. Current literatures revealed that PnET could be applied in wide zone, including America, Europe and Asia. PnET model is a useful tool to analyze forest growth, effect of different soil types and climate conditions on carbon, nitrogen and water flux of forest ecosystem. In addition, it can be used as predictor to estimate potential production of forest ecosystem in changing environment and provide information for improving land use efficiency.