A preliminary study of hydrological effects of litters layer and soil layer was carried out in six kinds of natural forest stands in the slope of north mountain of Hebei province.The result showed that:(1)The litter total storage capacity and the maximum water holding capacity showed this order: Larix principic-rupprechtii-B.platyphylla-B.davurica>B.platyphylla-Larix principic-rupprechtii>B.platyphylla-B.davurica-Larix principic-rupprechtii>Quercus mongolica-B.davurica>Populus davidian-B.davurica-Quercus mo...