The effects of different kinds of ecological restoration(alfalfa fallowing

natural vegetation restoration

and cropping) and fertilization management(chemical fertilizer + organic manure

chemical fertilizer + straw

chemical fertilizer application

and no fertilizer application) on the physical properties of degraded black soil were investigated.Results showed that fertilization management decreased soil bulk density

but increased porosity

capillary capacity

max moisture capacity

field water capacity

and the content of water-sable aggregates as compared with natural vegetation restoration.Chemical fertilizer

together with organic manure

significantly improved them as compared with other fertilizer treatments.However

significant difference was only observed between alfalfa fallow and natural vegetation restoration in terms of bulk density and porosity due to short time of ecological restoration.Bulk density

porosity and capillary capacity

max moisture capacity

and field water capacity changed greatly in 0-10 cm soil layer as compared with them in 10-20 cm soil layer.Both the content of water-stable aggregates(0.25 mm) and the mean weight diameter increased in the ascendant order of natural restoration

alfalfa fallow

and fertilization management.