三峡库区典型常绿阔叶林冠层降雨截留模拟研究

被引：5

作者：

王冉

王玉杰

王云琦

刘春霞

郭平

机构：

[1] 北京林业大学水土保持学院

来源：

长江流域资源与环境 | 2014年 / 02期

关键词：

修正的Gash模型; 常绿阔叶林; 冠层截留; 缙云山; 三峡库区;

D O I：

暂无

中图分类号：

S715.2 [林冠截流和树干水流];

学科分类号：

0829 ; 0907 ;

摘要：

为了验证修正的Gash模型对三峡库区内缙云山典型常绿阔叶林冠层截留模拟的适用性,基于2012年4～7月的气象和林分特征资料以及实测的穿透雨和树干茎流等资料,分析缙云山常绿阔叶林林外降雨、穿透雨和树干茎流特征,并应用修正的Gash模型对林冠截留量进行模拟,对比分析周降雨累计截留量和单次降雨截留量的模拟值和实测值,采用敏感性分析法分析模型参数对截留量的影响程度。结果表明:研究期间共34次降雨,总降雨量为522.1mm,平均降雨强度为1.3mm/h,大部分为低雨强、低雨量级、长历时的降雨;穿透雨量、茎流量和林冠截留量的实测值分别为450.9、9.6和61.6mm,模拟值分别为446.1、7.7和68.2mm,模拟的截留量约高出实测值10.8%,模型能够较好适用于缙云山常绿阔叶林场降雨截留总量的模拟。此外,对模型参数进行敏感性分析得出,以林冠郁闭度c对模拟结果影响最大,其次为平均降雨强度R、林冠持水能力S和林冠平均蒸发速率E,而以树干茎流系数pt和树干持水能力St这2个参数对林冠截留总量影响很小。

引用

页码：281 / 286

页数：6

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