A Study on Biomass and Nutrient Accumulation of Quercus aliena var.acuteserrata Stand at Luoyuan in South Slope of Qinling Mts

Quercus aliena var.acuteserrata stand is representative forestry in Heizhangtai tree farm, Luoyuan Town, Luonan Country, southern slope of Eastern Qinling Mts, Shannxi Province.In this paper, the biomass and nutrients accumulation of Quercus aliena var. acuteserrata stand was analyzed. Result showed that the biomass of 44-year-old Quercus aliena var. acuteserrata stand at Luoyuan of Qinling Mts was 292643 t/hm2,among them arbor layer, shrub layer, herb layer and litter layer accounted for 9552%, 124%, 021% and 303%, respectively. In the arbor layers, the biomass of leaves, branches, bark, trunk and roots accounted for 191%, 1273%, 1074%, 5113% and 2349%, respectively; in the understory vegetation layer, the biomass of shrub and herb layers accounted for 8558% and 1442%, respectively. In the litter layer the biomass of undecomposed sticks, undecomposed leaves and decomposed leaves accounted for 1510%, 3261% and 5229% respectively. The totally contained storage nutrients of 44-year-old Quercus aliena var. acuteserrata stand, including 0-60 cm depth soil reached to 3124212 t/hm2. The storage of soil layer accounting for 9882%. The nutrient accumulations of arbor, shrub, herb and litter layer accounted for 326%, 082% and 794%, respectively. Among the arbor layer, N, P, K, Ca, and Mg accumulation accounted for 2135%, 225%, 2005%, 5290% and 346%, respectively, and the nutrient accumulation of leaves, branches, bark, trunk and roots accounted for 725%, 1254%, 3027%, 3696% and 1298%, respectively. The density, age, altitude, type, etc. of Quercus aliena var. acuteserrata stand not merely affected the biomass and nutrients accumulation, but affected the nutrient cycling and energy flow of the ecosystems. In this context, the sharptooth oak's leaves, bark, litter and soil play an important role in nutrient biocycling of the stand.