The relationships with biological factor,soil nutrient and physical character in Hunan natural forest

The soil resource and character of natural forestry land was investigated,sampling and chemical analysis were carried out. 64 forest categories and data of sample from 306 forest land natural forest were obtained. 1465 samples with 26780 physical and chemical indexes of soil tested were analyzed.The profiles of soil of natural forest were investigated and analyzed completely.The relationships between the biological factors of natural forest and the physical and chemical factors of soil were colsely.The crude humus, full and fast absorbed amount of organic, N and P in the natural forest soil were calculated. The total soilpore space,non capillary porosity and hydrological characteristics all had same law:deciduous broaded leaves forest evergreen broaded leaves forest conifer forest.