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为了验证Gash林冠截留解析模型对于四川贡嘎山暗针叶林单场降雨的适用程度,利用2001年贡嘎山暗针叶过熟林单场降雨数据,运用Gash模型进行模拟计算,并将结果与实测值进行比较分析。结果显示:当林外降雨达到或超过使林冠饱和的降雨量时,运用Gash模型能很好的模拟林冠的截留量,而当小于这一降雨量时,估算结果误差偏大,不宜使用模型计算。另外,模型估算的误差率和林外降水呈中度负相关关系,而误差率跟降水强度不存在显著的相关关系。
In order to verify the applicability of Gash crown interception model to the single-field rainfall in dark coniferous forest in Gongga Mountain of Sichuan Province, single-field rainfall data of dark needle coniferous forest in Gongga Mountain in 2001 were used to simulate the results. Compare with the measured value. The results show that when rainfall outside the forest reaches or exceeds the rainfall which can saturate the canopy, the Gash model can well simulate the canopy interception, and when it is less than this rainfall, the estimation error is too large and should not be calculated using the model . In addition, the error rate estimated by the model has a moderate negative correlation with the precipitation outside the forest, while the error rate does not have a significant correlation with the precipitation intensity.