Effects Of Land Use On Soil Physical And Chemical Properties And Soil Anti-erodibility In Mid-subtropical Mountain Area

Soil physical and chemical properties and soil anti-erodibility were studied among six land use types including natural forest (Castanopsis carlesii and Cinnamomum chekiangens), plantation (Chinese fir), bamboo forest, orchard and slope farmland in mid-subtropical mountain area. The results showed that soil physical and chemical properties were deteriorated and soil anti-erodibility was reduced after natural forest was transfered into other land use types.(1)Soil bulk density increased by 0.08～0.22 g-cm-3 after natural forest was transfered into other land use types. The soil water storage capacity had no significant differences among different land use types. But the water seepage capacity of natural forest was higher than that of the others. The maximum water holding capacity decreased by 8.2%～29.83%, soil capillary capacity decreased by 18.05%～29.50%and field moisture capacity decreased by 21.94%～40.15% for surface soil after natural forest was transfered into other land use types. Those values for slope farmland decreased the most.(2) The organic carbon concentrations of the six land use types ranged from 6.28 to 26.06 g·kg-1 for surface soil, which decreased by 24.13%～72.94% after natural forest was transfered into other land use types. There had significantly negative correlation between soil organic carbon storage and soil bulk density for all the land use types except slope farmland.(3) The total N content decreased by 10%～45% for surface soil after natural forest was transfered into other land use types, and hydrolysable N decreased by 9.34%～58.48%. The total P and available P content were highest in orchard surface soil because of artificial fertilization.(4) The anti-erodibility of surface soil in natural forest was the strongest; plantation took the second place, followed by bamboo forest and orchard, and slope farmland came last. The anti-erodibility of soil decreased with the soil depth. The correlation analysis suggested that dispersion rate, ratio of structure deterioration, soil organic matter and >0.25mm water stable aggregates were well related to other soil anti-erodibility index.