密云水库人工水源保护林降水再分配特征研究

Studies on precipitation distribution property of the water resources protection forest in the Miyun Reservoir

对密云水库北京集水区3种类型人工水源保护林降水再分配特征研究,结果表明:在研究的2年间,大气降水总量545 mm,刺槐林穿透降水量437.78 mm,林冠截留量97.73 mm,树干茎流量12.49 mm;油松林穿透降水量397.98 mm,林冠截留量131.54 mm,树干茎流量15.48 mm;板栗林穿透降水量422.07 mm,林冠截留量11O.73 mm,树干茎流量12.20 mm。次降雨条件下,林内穿透降雨量与次降雨量之间呈线性相关,且呈极显著水平;林冠截留量与次降雨量之间呈指数正相关关系,亦呈极显著水平。

The paper studies the precipitation distribution property of three kinds of water resources protection forests, Robinia pseudoacacia, Pinus tabuleaeformis and Castanea mollissima, in the watershed of Miyun Reservoir in Beijing. With 545mm of total precipitation, the through-fall, canopy interception and stem-flow are 437.78mm, 97.73mm and 12.49mm for Robinia pseudoacacia forest; 397.98mm, 131.54mm and 15.48mm for Pinus tabuleaeformis forest; and 422.07mm, 110.73mm and 12.20mm for Castanea mollissima forest. The through-fall shows liner correlation with precipitation, whilst the interception exponential correlation with precipitation.