A Study on Water Retention Properties of Soil under Four Types of Forest Communities in Jinyun Mountain Nature Reserve

Taking the farmland land as the control,the physical properties and water infiltration of soil under four types of forest communities namely evergreen broadleaved forest,mixed coniferous and broad-leaf forest,Phyllostachys pubescens forest and shrub forest in Jinyun Mountain Nature Reserve were measured and analyzed.The study results implied that the soil bulk densities were ranked in the order of evergreen broadleaved forest mixed coniferous and broad-leaf forest P.pubescens forestfarmland landshrub forest,that of non-capillary porosity were shrub forest mixed coniferous and broad-leaf forest P.pubescens forest evergreen broadleaved forest farmland land.The water conservation of shrub forest was significantly higher than other land types,its water retention capacity was 1.4 and 2.14 times of bamboo forest and agricultural land respectively.The stable infiltration rate of the soil of five land types were ranked as humus layerprecipitation layerrock layer,the early infiltration of P.pubescens forest and farmland soil was much higher.The shrub forest with the early infiltration rate of 10.169 mm/min showed the strong permeability.In general,the hydrological function of shrub forest was significantly better than other forest types.The hydrological function of mixed coniferous and broad-leaf forest was better than evergreen broadleaved forest,and that of P.pubescens forest was the worst among the studied forest types.However,for the high intensity rainfall of short-duration,the performance of P.pubescens forest was slightly better than mixed coniferous and broad-leaf forest and evergreen broadleaved forest.