Abstract:
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 292643 t/hm2,among them arbor layer, shrub layer, herb layer and litter layer accounted for 9552%, 124%, 021% and 303%, respectively. In the arbor layers, the biomass of leaves, branches, bark, trunk and roots accounted for 191%, 1273%, 1074%, 5113% and 2349%, respectively; in the understory vegetation layer, the biomass of shrub and herb layers accounted for 8558% and 1442%, respectively. In the litter layer the biomass of undecomposed sticks, undecomposed leaves and decomposed leaves accounted for 1510%, 3261% and 5229% respectively. The totally contained storage nutrients of 44-year-old Quercus aliena var. acuteserrata stand, including 0-60 cm depth soil reached to 3124212 t/hm2. The storage of soil layer accounting for 9882%. The nutrient accumulations of arbor, shrub, herb and litter layer accounted for 326%, 082% and 794%, respectively. Among the arbor layer, N, P, K, Ca, and Mg accumulation accounted for 2135%, 225%, 2005%, 5290% and 346%, respectively, and the nutrient accumulation of leaves, branches, bark, trunk and roots accounted for 725%, 1254%, 3027%, 3696% and 1298%, 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 biocycling of the stand.