Response of Soil Chemical Properties to Vegetation Succession of Quercus pannosa Forest in Subalpine Area of Northwest Yunnan

The change of soil chemical properties of Quercus pannosa forest in subalpine area of northwest Yunnan was explored.The results indicated that the soil chemical properties were correlated with the different stages of vegetation succession.All the indexes of soil chemical properties showed the tendency to sound development as the progress of positive succession.The specific performance were decrease of pH value,increase of organic matter,total N and hydrolytic N.The content of available K achieved the maximum value before the climax vegetation,and slightly decreased at the climax vegetation.The change of P did not show obvious regular during the course of succession.As the succession of vegetation,the nutrient contents in the upper layer were higher than the lower layer.It is concluded that the soil chemical properties of the studied area are positively correlated with the sound development of plant community.