Abstract: The nutrient characteristics were studied in view of different aged Pinus massoniana plantations.The results showed that the physicochemical indexes were significantly different at different ages in addition to the pH value of soil.The soil bulk density is the lowest for 1.16 g/cm³ in the mature forest soil,but the water content,available nitrogen and organic matter content of the mature forest soil are the highest,respectively 167 mg/cm³ and 20.17% and 19.38 g/kg;The soil available phosphorus,available potassium,total nitrogen,total phosphorus,total potassium content of near mature forest are the highest,respectively 18.01 mg/cm³,67.86 mg/cm³,1.33 g/kg,0.67 g/kg and 28.18 g/kg;There is a significant relationship between different fertility indexes;According to the calculation results,soil fertility of different aged Pinus massoniana plantations is in such an order from high to low as near mature forest>mature forest>middle age forest>the young forest.

Key words: Pinus massoniana, soil nutrient, fertility evaluation