In a rubber plantation intercropped with A. longiligulare(RA) and a pure rubberplantation (PP) of 30-year-old, biomass and nutrient element of each component of tree, in-tercrops and litters were detected. Biomassallocation in terms of diameter class, net productionand nutrient accumulation of two plantation, have been studied comparatively. The resultsshowed that the total biomass of RA was 139. 85 t/hm2, among which the biomass of trees,intercrops and litters accounted for 72. 7 %, 22. 6 %, and 5. 2 % res...