Study on Water Conservation Functions of Undergrowth Vegetation and Litter Under Four Stands in Nature Reserve of Saihanwula

Taking four typical stands for object in nature of reserve Saihanwula,this paper research water conservation functions of undergrowth vegetation and litter.The result showed that ①The more complex of stand,the greater of species diversity in understory vegetation,the greater ability of its interception of rainfall.②The volume of the four stands types of litter in the range of 12.44～31.60t/hm2,accumulation of coniferous forest litter was significantly higher than the broad-leaf forest.③The water-holding of litter size order was poplar forestbirch forest poplar birch forest larch forest,The water absorption of litter of poplar forest(511%) was 1.8 times the larch stands(280%).④The maximum moisture capacity of litter was coniferous and broad-leaf mixed forest coniferous forest broad-leaf forest.The maximum interception of litter was coniferous forest coniferous and broad-leaf mixed forest Broad-leaf forest.Effective retaining content of larch forest was the highest(6.56mm),effective retaining content of Birch forest was the least(3.38mm).