中文摘要：

植被覆盖对陆气之间物质和能量交换过程具有极其重要的影响,但植被覆盖对于交换过程的影响因子很多,关系复杂。作者研究了各种植被因子对陆气之间水分循环的作用和相对重要性。首先通过单点NOAH模式对吉林通榆农田下垫面2004年土壤和边界层各物理量进行模拟,并与观测结果比较和评价,肯定了单点NOAH模式模拟能力。使用这一模式进行敏感试验,将与植被有关的参数分别在其取值范围取较大与较小值,比较水分循环各物理量如土壤湿度、土壤蒸发、植被蒸腾等的变化情况。试验表明在各参数中植被气孔阻抗、根系深度、土壤湿度初值和反照率对水分循环的影响较大,而叶面积指数、粗糙度和冠层阻抗则影响较小。

英文摘要：

Vegetation cover has important impact on the exchanges of substance and energy between land and atmosphere. But the impact factors of vegetation cover on exchange are complex.The variables in soil surface and boundary layer of grass land in Tongyu County,Jilin Province by using stand-alone NOAH LSM(Land Surface Model) are simulated.In comparison with the observations,the simulation capability is proved.Sensitivity test is done by using this model,selecting the maximum and minimum of vegetation-related param...