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BIOMASS AND NNTNENT CYCLING STUDIES IN SOME MIXED STANDS OF PINE AND MAPLE IN XISHAN AREA BEIJING

Zhai Mingpu  
The biomass and its net increment of a 25-year old pine-maple mixed stand was compared with that of a pure pine stand.The total mass of the litter layer from both stands and the monthly yield of litter production during one year were measured.The contents of nutrient elements (N,P,K and other ash elements)in all parts of the trees,in the fallen litter at different periods and those of the soils were determined.From these data,estimations of the annual amount of nutrient elements.absorbed,remained and returned to the soil,in the stands studied were made.The results give evidence to show the superiority of the mixed stand in some respects,as compared with the pure stand.In the mixed stand,the volume increment is 44.46% higher,the nutrient elements accumulated in fallen litter is increaced by 12.82-26.83%,and the amounts of nutrent elements,remained and returned to the soil,are 142.47%and 13% larger respectively.The amount of available nutrient elements in the soil under mixed stand is also greater than that of the pure stand.Litter of maple is more readily decomposed than that of pine,and the amount of nutrient elements so returned is 1.8-4.2 times larger (with equal basal areas).Maple is,therefore,considered to be a right species for soil enrichment.A pine-maple mixture is accordingly a good choice of stand composition under the natural conditions of xishan area.
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