Due to adaptation to the infertile habitat,Acacia mangium is widely planted as pioneer species in tropical and south subtropical regions in China.The content,accumulation,distribution and biological cycling of six nutrient elements (N,P,K,Ca,Mg and S) as well as their changes with growth of stands in A．mangium plantation of three different age classes(4-year-old,7-year-old and 11-year-old)were studied．The results show that concentrations of these six nutrient elements in different components of A．mangium plantation were in the order of leaves > bark > alive branch > dead branch or root > stem.In plant,concentration of N was the highest among the six elements,followed by K and Ca,while Mg and P were the lowest in various components of A．mangium plantation.In the soil, concentration of K was the highest,then Ca,Mg,N,P,and S concentration was the lowest among six elements. Concentrations of N,P and S in the 0-40cm of soil depth increased with increasing stand age.The total nutrient accumulations at three different age classes plantation were 1022.08 kg•hm-2,1997.08 kg•hm-2 and 2633.45 kg•hm-2,respectively.Of the total storage of nutrients,73.64%-8365% was distributed in arbor layer,6.20%-13.74% at forest floor layer,8.87%-12.62% at standing litter layer.Among six elements，N accumulation in arbor layer was largest,covering 53.90%-60.07％ of total nutrient storage.P accumulation in arbor layer was the lowest,only 0.90%-1.23% of total nutrient storage.The accumulations of nutrients in A．mangium varied with different stands growth stages.Most nutrient elements accumulated in leaves and branches at 4-year-old stage,while they gradually moved gradually in stem and bark at 7-year-old and 11-year-old.Nutrient annual net accumulations in three age classes plantation were 188.16 kg•hm-2•a-1,235.06 kg•hm-2•a-1 and 200.26 kg•hm-2•a-1, respectively.Comparison of nutrient annual net accumulation in different components was in the order of stem > leaves > branches > roots > bark.Changes in annual net accumulation of various nutrients in the same component was similar to that in various components,N>Ca>K>S>Mg>P.The annual absorption of six nutrient elements in three age classes plantations were 382.35 kg•hm-2•a-1,432.04 kg•hm-2•a 1 and 403.15 kg•hm-2•a-1,respectively.The annual returns equaled to 194.19 kg•hm-2•a-1,196.98 kg•hm-2•a 1 and 202.89 kg•hm-2•a-1,respectively.The nutrient utilization coefficients were 0.51,0.26 and 0.18,respectively.The cycling coefficients were 0.51,0.46 and 0.50,respectively.The recycling periods were 3.88,8.35 and 10.86,respectively.As observed，the nutrient utilization efficiency in early stage in A．mangium plantation was lower but return rate was higher.When stands approached near-mature stage(11-year-old),the recycling period of nutrients increased with the augmentation of return rate,resulting in the recovery,maintenance and enhancement of forestland fertilization.