Research On Rainfall Redistribution And Soil Water Conservation Functions Of Betula Platyphylla Secondary Forests In Da Xing’an Mountains

Daxinganling located in cold temperate regions, zonal vegetation is dominated bright coniferous forest, logging and vandalism, forming a large area of secondary forest, these secondary forests in water and soil conservation, water purification, water conservation and improvement of climate plays an irreplaceable role. Therefore, The characteristics of rainfall redistribution and water conservation of Betula platyphylla secondary by using the method of locating observation was studied in Da Xing’an Mountains, expectations for the hydrological effects of forests areas and forest in the region of small watershed Ecological functions for further research to provide scientific support. The results showed that, Total penetration of rain was392.55mm, accounting for84.27%of the total rainfall. With the increase of rainfall, penetrating rain and penetration rate as follows: rainstorm> heavy rain> moderate rain> light rain. Total stem flow was12.50mm, accounting for2.68%of the total rainfall over the same period. Canopy interception total was60.76mm, accounting for13.04%of the total rainfall over the same period. With the increase of rainfall, canopy interception rate showed a decreasing trend. Penetrating rain, stem flow, canopy interception (rate) has certain relationships with rainfall. Total shrub interception was1.75mm, accounting for0.37%of the total rainfall. Litters interception total58.97mm, accounting for12.66%of total rainfall, Betula platyphylla secondary forest litter total thickness was58.33±7.25mm, total volume was8.13±1.05t/hm2, maximum water holding capacity was55.65t/hm2. Litter total effective interception deep3.32mm. Betula platyphylla secondary average0-20cm soil bulk density was1.09g/cm3, soil non-capillary porosity was11.43%.0-20cm average soil water holding capacity, capillary water were570.60g/kg,456.25g/kg, Betula platyphylla secondary forest forestland effective water-holding capacity was261.88t/hm2. Betula platyphylla secondary forest initial infiltration, steady infiltration rates were1.03mm/min and0.15mm/min, steady infiltration time was53min. Betula platyphylla secondary forest effective water-holding capacity was261.88t/hm2. After the rain through Betula platyphylla forest canopy, shrubs, litter layers interception, were reassigned. From the canopy to the litter layers, the total amount of interception was26.07%, only73.93%of rainfall into the soil layer,0-20cm layer of effective soil water holding capacity was90.76mm, used to supplement infiltration or runoff.