Hydrologic Characteristics of Litter under Different Forest Types in Tuqiaogou Watershed

ZHAO Zhi-feng,GUO Jian-bin,ZHAO Ting-ning,YE Hai-ying,YANG Xiao-mei (Key Laboratory of Soil and Water Conservation and Desertification Combating of Ministry of Education,College of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China)

Tuqiaogou valley;litter;hydrologic characteristics

The litter preservation and its water-holding capacity in five main forest types at Tuqiaogou watershed were studied.The litter preservation,water holding capacity and water absorption speed,ect.were determined.The result showed that the litter amount in different forests followed the sequence of Pinus tabulaeformis>Robinia pseudoacacia>P.tabulaeformis and R.pseudoacacia>Ulmus pumila>Platycladus orientalis,the quantity ranging from 3.00 to 7.28 t/hm2.The maximum water holding capacity of litter in different forests was in the order of P.tabulaeformis>P.tabulaeformis and R.pseudoacacia>R.pseudoacacia>U.pumila>P.orientalis.The maximum rate of water retention of P.orientalis was 256.67%,P.tabulaeformis and R.pseudoacacia mixture 244.42%,U.pumila 224.00%,R.pseudoacacia 214.05% and P.tabulaeformis 177.43%.For litter undecomped or semi-decomposed,the water absorption speed was very fast in the beginning 0.25 hours;within first 2 hours water absorption speed droped quickly and would approach to 0 after immersion for 24 hours.