Comparison on soil physical and chemical properties at different vertical zones of Carya cathayensis stands.

Soil samples from Carya cathayensis stand at elevation of 200-800 in Lin'an city,Zhejiang province were collected and analyzed for soil physical and chemical properties.The results showed that soil bulk density had no significant differences,but non-capillary water holding capacity had great difference between different altitudes.Gravel content in the soil increased with the rise of altitude with the mean value of 10.90%,while sand,silt and clay in the soil had no evident difference.With increase of the elevation,pH value decreased from 6.08 to 4.71,and the content of organic matter in the soil increased from 28.09 g/kg to 47.59 g/kg.The mean hydrolysis nitrogen,potassium,availability phosphorus and sulfur were 198.08mg/kg,105.00mg/kg,4.98 mg/kg,25.97 mg/kg,and it had no regulation of change between different altitudes.The content of trace elements in the stands were as follows: Mn Fe Ca Mg Zn Cu B,and there was no clear correlation between different altitudes.