THE STORAGE AND CYCLING NUTRIENT OF Ixonantheschinensis IN SOUTH SUBTROPIC BROADLEAFEVERGREEN FORESTS,HEISHIDING NATURALRESERVE,GUANGDONG PROVINCE*

Studied nutrient distribution,nutrient storage,and annual nutrients uptake in different parts of trees and concluded that nutrients vary in leaves of different mature state and in bark and wood.Internal cycling of N,P,K indicates the conservation recycling of these nutrients.Large amount of nutrients stored in this population indicate which play an important role in the forest.The turnover time of N,P,K,Ca,Mg in the population is 121,131,188,122 and 1904 year respectively.