在广东省森林资源一类清查样地(50个)的四个角外2m处设置3个2m×2m的林下植被生物量调查样方,对林下灌木层植物组成和结构进行详细调查,并采用收获法测定每个样方中林下灌木层优势植物各器官生物量.结果表明:粤东地区森林灌木层植物种类丰富,6种森林类型150个样方中的主要灌木和小乔木有93种,分属36科72属,其中丰富度最大的为桃金娘、红背山麻杆、山苍子、山乌桕、檵木、岗松、栓叶安息香、白花灯笼、变叶榕、三桠苦、石斑木、托竹等.根据测定的生物量,建立了12个优势灌木各器官生物量相对生长方程,统计分析验证表明估算模型能满足生物量估算的精度,为估算广东省森林林下灌木层的生物量和碳贮量提供了科学依据.%To investigate the composition, structure and biomass of shrub communities under subtropical forest ecosystems, 50 permanent plots designed by National Forestry Inventory of China were selected in eastern Guangdong province, and three sample plots with size of 2m X 2m were established at 2 m distance from three of the four corners of each permanent plot. A total of 150 sample plots were investigated to record plant species, basal diameter, total height, and canopy diameter. The harvest method was used to measure the leaf, branch, stem, root and total biomass for dominant species of understory shrubs. Results showed that the species of the understory shrubs were rich. There were 93 species belonging to 36 families and 72 genera in the communities of shrubs in this study area. The 12 dominant plant species with highest richness were Rhodomyrtus tomentosa, Alchornea trewioides (Benth.) Muell. Arg., Litsea cubeba (Lour.) Pers., Sapium discolor (Champ.ex Benth.) Muell.-Arg., Loropetalum chinensis (R. Br.) Oliv., Baeckea frutescens L., Styrax suberifolius Hook. & Arn., Clerodendrum fortunatum Linn., Ficus variolosa Lindl. Ex Benth., Evodia lepta (Spreng.) Merr., Raphiolepis, and Pseudosasa cantori (Munro) Keng f. Biomass allometric equations of these 12 dominant species were established to calculate the biomass of the stem, branch, leaf, root, and the whole plant. The accuracy of these models was verified to meet the requirement of biomass estimate. This study not only offers the basic data of species composition of the shrub community of Guangdong Province, but also provided an efficient approach to estimate biomass and carbon storage of shrub.
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