Evaluation on Water Conservation Function and Its Supply and Demand Evaluation of Forest Water Resources in Mao'er Mountain of Guangxi

The water conservation function of surface litter and soil of five typical forests (alpine dwarf forest,Tsuga chinensis forest,Fagus sylvatica forest,broad-leaved forest and Phyllostachys pubescens forest)in Mao'er Mountain of Guangxi was studied.The results showed that there was great differences of water conservation function among the litter and soil of different forest types.The order of the maximum water-holding capacity of the surface litters of five typical forest types was Tsuga chinensis forest(48.2 t/hm2) broad-leaved forest (32.8 t/hm2) alpine dwarf forest (30.5 t/hm2) Fagus sylvatica forest (25.7 t/hm2) Phyllostachys pubescens forest (13.8 t/hm2).The order of the maximum water-holding capacity of soil of five typical forest types was T. chinensis forest (1 424.7 t/hm2)broad-leaved forest (1 184.7 t/hm2)alpine dwarf forest (1 105.3 t/hm2) F.sylvatica forest (1 090.0 t/hm2) P.pubescens forest (1 086.7 t/hm2).T. chinensis forest had the greatest water conservation function,while F.sylvatica forest had the lowest water-holding capability.The maximum water carrying capacity of Mao'er Mountain forest ecosystem was enough to ensure a water level of over 0.7 m in Lijiang River.In addition,more attention should be paid to the area enlargement of F.sylvatica forest for the hydrological ecological protection in the forest region.