Hydrological Effects of Six Natural Pure Forests Litters and Soil in Northern Mountain of Hebei Province

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: ①The litter total storage capacity was about 3.44～23.97 t/hm2,which was in order of Betula platyphylla Suk.pure forest Pinus tabuliformis pure forest Populus davidiana pure forest Acer elegantulum pure forest Quercus mongolica pure forest Ulmus davidiana Planch pure forest,the maximum water holding capacity ranged from 5.16 t/hm2 to 45.11 t/hm2,which was in order of Acer elegantulum pure forest Populus davidiana pure forest Quercus mongolica pure forest Betula platyphylla Suk.pure forest Pinus tabuliformis pure forest Ulmus davidiana Planch pure forest.The modified interception amount of Populus davidiana pure forest was the strongest to 35.45 t/hm2,Ulmus davidiana Planch pure forest was the worst to 2.66 t/hm2.②Without decomposition litter in 8 h,and semi-decomposition litter reached saturation in 6 h,water holding capacity and soaking time of without decomposition litter and semi-decomposition litter both had visible logarithmic relationship,in first half-hour,the absorption rate was the largest,the rate was obviously slowed down after 4 h,the relationship of absorption rate and immersion time was power function.③The average of soil bulk density ranged from 0.82 g/cm3 to 1.14 g/cm3,total soil porosity was about 44.43%~56.97%.④The soil water-holding capacity of Acer elegantulum pure forest was the most powerful to 116.00 t/hm2,and Betula platyphylla Suk.pure forest was the worst to 40.50 t/hm2,infiltration rate and infiltration fit time was power function.