植被界面过程(VIP)模型的改进与验证

Improvement and validation of vegetation interface process model

为了提高植被界面过程(VIP)模型的预报能力,对VIP模型的一些参数化方案进行了更新,包括基于相对生育期的根深动态、根系分布密度和比叶面积季节变化,使模型能从机理上更合理地描述作物同化物分配及土壤水分运动。将改进后的模型应用于河北栾城冬小麦生长季的叶面积指数、生物量和土壤水分模拟,并与相应时期的试验资料对比验证。结果表明,改进后的VIP模型对土壤水分动态和冬小麦叶面积指数的模拟效果更好,模型各状态变量模拟值与观测值的均方根误差和相关系数都得到明显提高。

In order to improve the prediction capability of vegetation interface process （VIP） model,some parameterization schemes were updated,including the descriptions about the root depth with sinusoid of relative development stages,the root distribution density in soil depths,and the specific leaf area （SLA） variation in growth stages. The improved model was used to simulate the leaf area index,plant biomass,and soil moisture content at the Luancheng Agricultural Station in Hebei Province,and validated by the field observation data during the same periods. The results showed that the model performances in simulating soil moisture content,leaf area index,and other state variables were improved.