Study on the Physi-Chemical Characters of the Representative Forest Soil in Northern Jiangsu Province

According to the investigation,analysis and comparison of the vegetation factors and physi-chemical characters of the 5 representative sampling areas under different forests,a conclusion is drawn:the average soil hardness is 11.86(±3.59)～18.57(±10.26)kg/cm2 and the average content of the organic matter is 1.89(±0.27)%～2.36(±0.08)% under different forest.The average soil bulk density,the clay ingredient,and the soil water content of the evergreen conifer forest are less than those of the deciduous broad-leaved forest,soil nutrient and pH value of the evergreen conifer forest are also lower than those of the deciduous broad-leaved forest.The soil permeability and the ability of nutrients holding are better under evergreen conifer forest.The contents of the organic matter,N,P and the capability of nutrients provision are also higher in the soil of the deciduous broad-leaved forest,especially of the Robinia pseudoacacia forest.