植被地表反照率动态模拟方法比较——以玉米农田为例

Comparison on dynamic simulation methods of vegetation surface albedo:a case study in maize field

利用2007年锦州玉米农田生态系统野外观测站玉米生长季辐射资料,对地表反照率综合模型、半经验双层模型和简化双层模型的模拟精度进行比较。结果表明:简化双层模型对玉米生育初期模拟能力较差,其他时段模拟能力均较强,尤其在玉米生育后期更明显;半经验双层模型除在玉米叶面积指数处于最大时期模拟误差较小外,其他时段基本无法模拟。综合模型在玉米生育期大部分时段模拟能力均较强,仅在玉米生育后期模拟能力稍差,该模型对实现玉米农田地表反照率动态参数化更理想,可为改进陆面过程模型提供参考。

Using radiation data from Jinzhou agricultural ecosystem research station during corn growing season in 2007 ,simulation precisions of vegetation surface albedo （α）from different dynamic simulation models were com-pared,including models of a comprehensive（CM）,a semi-empirical double layer（SEDLM）and a simplified doub-le layer（SDLM）.The results show that the SDLM achieves higher simulation precision in most time of growing season,except during the seedling period.However,simulation errors of the SEDLM are only acceptable when leaf area index reaches the maximum,and αsimulated by the SEDLM is useless in most growth periods.By contrast, the CM exhibites stronger simulation ability in most growth periods,except during the late growth.Therefore,the CM is the desirable method to perform dynamic parameterization ofαin maize field,which could provide refer-ences for improving land surface model.