Study on the Soil Nutrient and Correlation of Four Types of Planted Forests in Changsha Urban-rural Connective Areas

Taking four planted forests of urban-rural connective areas in Changsha as the research object,soil physical and chemical properties of different forests were analyzed and coefficient between them was studied.The results showed that the regulation of soil physical properties was significant in vertical distribution.Soil bulk density increased with increasing soil in the same forest and the capillary porosity,total porosity and water content were opposite.Soil bulk density had a highly significant negative correlation with capillary porosity and total porosity(P0.01),and had significant negative correlation with water content(P0.05).Capillary porosity was highly significant correlation to total porosity(r=0.943,P0.01).Water content had a significant correlation with total porosity(P0.05),and a highly significant correlation with capillary porosity(r=0.815,P0.01).The regulation of soil chemical properties was significant in vertical distribution,which was decreased with increasing soil.The correlation coefficient between pH and soil nutrient was negative.PH was significant negative correlation with A.N(r=-0.661,P0.05).Soil organic matter had significant correlation with TN,TP,TK and A.K(P0.05) and had highly significant correlation with A.N(r= 0.760,P0.01).Soil total nutrient was significant correlation to soil available nutrient.