Assessment And Mechanism Of The Shrub Water Conservation Function In East Mountainous Region Of Heilongjiang Province

With the concerns of water conservation and in comparison with a piece of abandoned land, Interception capacity, Moisture capacity of litter, and soil of Bulk density, Non-capillary pore, Moisture capacity, Infiltration capacity of five main kinds of shrub in east mountainous region of Heilongjiang province were selected to test the water-holding capacity. Five kinds of shrub's interception rate declined order was Corylus heterophylla 24.86%, Sambucus mandshurica21.24%, Sorbaria sorbifolia 19.10%, Lespedeza bicolor 11.99%, Spiraea ussuriensis 7.70% in the rainy season. The maximum moisture capacity of the litter varied from 20.90 to 33.48t/hm2. And the maximum moisture capacity of the soil varied from 2802.31 to 1512.73t/hm~2, and its effective moisture capacity declined order was Lespedeza bicolor 737.80t/hm~2, Sorbaria sorbifolia 658.58t/hm~2, Corylus heterophylla 594.36t/hm~2 Sambucus mandshurica 571.80t/hm~2, Spiraea ussuriensis 462.86t/hm~2.In the end the abandoned land 315.43t/hm~2.The final infiltration rate of topsoil (0~20cm) varied from 2.46~6.25mm/min in the different shrub types. The final infiltration rate of Corylus heterophylla (6.25mm/min) was the biggest one. It was 6.87 times as velocity as abandoned land(0.91mm/min).Infiltration capacity of soil varied from 134~223mm at the first 30min in the different shrub types. The infiltration capacity of Corylus heterophylla also was the most one. Comprehensive analysis each factor, Lespedeza bicolor was the best one of water conservation, next were Sorbaria sorbifolia, Sambucus mandshurica, Corylus heterophylla and Spiraea ussuriensis. The abandoned land was the last one.