The soil water conserving function of different vegetation types in the Beichuan River Nature Reserve of Datong
[Objective]The soil water conservation function under different vegetation types in Beichua-nhe National Nature Reserve was studied to provide reference for soil and water conservation,water conser-vation forest protection and management in the area.[Method]Soils under 5 typical vegetation types(al-pine meadow,alpine shrub,deciduous forest,mixed coniferous forest and coniferous forest)in the protected area were selected and their physical properties,soil water holding capacity and soil permeability were ana-lyzed by ring knife method and drying method.The function of soil water conservation of different vegeta-tion types in the study area was evaluated by the coordinated comprehensive evaluation method.[Result]There are obvious differences in the physical properties,water storage capacity and infiltration capacity of the planted subsoil.The mean bulk density of the soils ranged from 0.87 to 1.41 g/cm3,with alpine meadow(1.41 g/cm3)being the highest and alpine shrub(0.87 g/cm3)the lowest.Total soil porosity was the highest in coniferous forest(55.62%)and alpine shrub(37.39%).Capillary porosity was highest in co-niferous forest(43.80%)and lowest in alpine shrub(27.55%).Non-capillary porosity was highest in mixed forest(12.13%)and lowest in alpine meadow(6.70%).Maximum water holding capacity was highest in co-niferous forest(1 112.36 t/hm2)and lowest in alpine shrub(747.80 t/hm2).Capillary water retention was highest in coniferous forest(875.95 t/hm2)and lowest in alpine shrub(551.00 t/hm2).Non-capillary water holding capacity was highest in coniferous mixed forest(242.62 t/hm2)and lowest in alpine meadow(134.04 t/hm2).Soil permeability was highest in the mixed forest with a stable infiltration velocity(4 mm/min)and a stable infiltration coefficient(2.65)and lowest in the alpine meadow with a stable infiltration ve-locity(1.13 mm/min)and a stable infiltration coefficient(0.86).[Conclusion]The comprehensive evalua-tion and analysis showed that among the five different vegetation types,the mixed forest had the best water conservation function,with the comprehensive capacity value of 0.383 4.Coniferous forest and deciduous broad-leaved forest were the next,with the comprehensive ability values of 1.386 2 and 3.052 6,respec-tively.Shrub forest and alpine meadow were relatively poor,with the comprehensive ability value of 3.412 6 and 4.813 3,respectively.
Beichuan River Nature Reservewater source conservation functioncoordinate comprehen-sive evaluation method
万方数据
维普
