关键词: 冠层截留, 截留容量, 截留模型, 六盘山, 夏玉米, 需水关键期, 降水年型, 统计模型, APSIM

Abstract: Based on field observation and modeling analysis, this paper studied the canopy interception, interception capacity, and some parameters for interception modeling of main forest types in Liupan Mountains of China. For the test main forest types, the ratio of their canopy interception to precipitation ranged from 8.59% to 17.94%, throughfall was more than 80%, and stemflow ranged from 0.23% to 3.10%. The canopy interception capacity was 0.78-1.88 mm, among which, leaf interception capacity was 0.62-1.63 mm, and stem interception capacity was 0.13-0.29 mm. Conifer forest had a higher canopy interception capacity than broad-leaved forest. The modified model considering the change of leaf area index, which was used in this paper, had a higher simulating precision than the interception model used before. The simulation results for Betula albo-sinensis  forest, Pinus armandii  forest, Prunus shrub, and Quercus liaotungensis-Tilia paucicostata forest were good, but those for Quercus liaotungensis forest, Pinus tabulaeformis forest, and Acer tetramerum and Euonymus sanguineus shrub were bad, which might be related to the differences in  canopy structure, leaf area index, and precipitation characteristics.

Key words: canopy interception, interception capacity, interception model, Liupan Mountains, summer maize, critical period of water requirement, yearly precipitation pattern, statistical model, APSIM.