The evaluation on the soil water conservation function of five types forests in urban water source region

Combining field survey and indoor analysis,adopting an evaluation model of entropy-based water conversation capacity relative superiority quantitative,this research made a quantitative analysis on Songhuaba reservoir catchment,which involves five types forests,Deciduous Broad-leaved forest( A1),evergreen broad-leaved forest( A2),evergreen and deciduous broad-leaved mixed forest( A3),coniferous forest( A4) and deciduous broad-leaved and coniferous mixed forest( A5). The results indicate that the score sorting of litter water conservation capacity in different types vegetations are evergreen broad-leaved forest( 0. 3175) evergreen and deciduous broad-leaved mixed forest( 0. 2883) deciduous broad-leaved forest( 0. 0904) deciduous broad-leaved and coniferous mixed forest( 0. 0288) coniferous forest( 0. 0039); the score sorting of soil layer water conservation capacity in different types vegetations are evergreen and deciduous broad-leaved mixed forest( 0. 6067) deciduous broad-leaved forest( 0. 3634) deciduous broad-leaved and coniferous mixed forest( 0. 2102) evergreen broad-leaved forest( 0. 0762) coniferous forest( 0. 0345); the total score sorting of water conservation capacity in different types vegetations are evergreen and deciduous broad-leaved mixed forest( 0. 8950) deciduous broad-leaved( 0. 4538) evergreen broad-leaved forest( 0. 3937) deciduous broad-leaved and coniferous mixed forest( 0. 2390) coniferous forest( 0. 0384). Studies suggest that in the future water source protection,more broad-leaved tree species and more broad-leaf coniferous mixed forest should be planted,which is more beneficial to water source conservation and to forest vegetations supply continuous water to reservoir.