Biomass Allocation Between Aboveground-and Underground of shrub Layer Vegetation in Natural Evergreen Broad-Leaved Forest and Chinese Fir Plantation C, N, P stoichiometric characteristics of tree, shrub, herb leaves and litter in forest community of Shaanxi Province, China. INTERSPECIFIC ASSOCIATION AND CORRELATION OF SHRUB LAYER IN THE CONIFEROUS BROAD LEAVED MIXED GEOBOTANICAL ZONE OF RUSSIA PLAIN Influence of Overstory on Seasonal Variability of Understory Herbs in Primary Broad-leaved Korean Pine Forest of Changbai Mountain Study on biomass estimation methods of understory shrubs and herbs in forest ecosystem