林业科学2011，Vol.47Issue(9)：15-20,6.
基于修正的Gash模型模拟缙云山毛竹林降雨截留
Simulation of Canopy Rainfall Interception of the Phyllostachys edulis Forest with the Revised Gash Model in the Jinyun Mountains of Chongqing
摘要
Abstract
In order to verify applicability of the revised Gash analytical model in simulating canopy interception of the Phyllostachys edulis forest in the Jinyun Mountains, the rainfall, throughfall and stemflow characteristics and their heterogeneity was measured, and the canopy interception was simulated with the revised Cash analytical model. A comparison in week cumulative rainfall and a rainfall event interception was conducted between the simulated and actual values basing on meteorological data, forest survey data during April ~ July of 2009. In addition, effects of the model parameter on interception was analyzed with a sensitivity analysis method. The results indicated that the cumulative gross rainfall of 29 sampled events was 531. 1 mm and the mean rainfall intensity was 2. 11 mm·h-1 . The measured throughfall, stemflow and canopy interception were 463. 2, 6. 5, and 61. 4 mm, respectively. Most of the rainfalls had a low rainfall intensity, low rainfall levels, and long duration. Throughfall, stemflow and canopy interception simulated by the revise Cash model were 461. 1, 6. 1, and 63. 9 mm, respectively. The revised Gash analytical model of rainfall interception was employed and the simulated interception values were close to the measured ones with an underestimation of 4. 07 % . The comparison between the simulated and the measured canopy interception per week and per rain event during the study period showed that the relative standard error in the two interceptions between the simulated and the measured ones was 5.02% and 7.13%, respectively, indicating that the Gash analytic model could be used for estimating canopy interception in the P. Edulis forest in Jinyun Mountains. The simulation with the revised Gash model was impacted most by canopy cover ( c) , followed by mean rainfall intensity ( R) , canopy storage capacity ( S) , mean evaporation rate during rainfall (E) . But the simulation was not sensitive to trunk storage capacity ( S, ) and proportion of rain diverted tostemflow (p,) since these two parameters only had a small effect on total interception.关键词
修正的Gash模型/毛竹林/林冠截留/缙云山Key words
revised Gash analytical model/ Phyllostachys edulis forest/ canopy intercepaion/ Jinyun Mountains分类
农业科技引用本文复制引用
赵洋毅,王玉杰,王云琦,刘楠,刘敏,吴云,陈林..基于修正的Gash模型模拟缙云山毛竹林降雨截留[J].林业科学,2011,47(9):15-20,6.基金项目
林业公益性行业科研专项(201104009-03,201104005-01) （201104009-03,201104005-01）
中央高校基本科研业务费专项(YX2011-26) （YX2011-26）
长江三峡库区(重庆)森林生态站. （重庆）
