抚育间伐对森林植被涵养功能有较大影响，以冀北山地不同抚育间伐措施后华北落叶松人工林的植被层、枯落物层和土壤层为研究对象，对其水源涵养功能进行了初步分析。结果表明：华北落叶松林植被截留能力和枯落物持水功能随着间伐保留密度的减小而减小；土壤蓄水功能随着间伐强度的增大表现出逐渐增大趋势。间伐后对其进行枯落物收集、清除等经营活动可增大其植被截留功能和枯落物持水功能，但会降低其土壤蓄水功能。三个层次当中，土壤蓄水功能所最大，其次是枯落物持水功能，植被截留功能最小。对华北落叶松人工林进行合理抚育间伐，能提高其涵养水源功能。

Forest thinning imposed the large effects on forest water conservation. Based on vegetation layer, litter layer and soil layer of Larix principis-rupprechtii plantation after thinning in different intensities in mountainous area of north Hebei province, forest water conservation was studied. Results showed that 1) vegetation interception and litter water retention decreased with the decrease in thinning intensity; 2) soil water-holding ability was raised by increased thinning intensity. Collecting litter after thinning could increase vegetation interception and litter water retention ability. Soil water-holding ability played the most important part in vegetation water conservation ability, next was litter water retention ability and least was vegetation interception ability. Larix principis-rupprechtii platation thinning reasonably could improve forest water conservation.