中文摘要：

采用样带法和“倒逐龄级累加法”分析贡江下游河岸硬头黄竹次生林随河流梯度变化的物种组成结构及其分布格局．结果表明硬头黄竹河岸带群落乔木层和灌木层树种的本土特性强，乔木层伴生树种和灌木层物种随河流梯度变化而割裂，与岸边高地植物相关，不符合河岸连续规律的RCC理论；草本层植被符合RCC规律，下河段植物种类最丰富，达29科55属70种．各河段硬头黄竹处于群落绝对优势地位，适应异质河岸生境的密度调控和生理整合作用，其增殖速率随时间推移呈快速降低，然后趋于稳定下降的变化趋势；聚集分布程度随时间推移呈增强趋势，平均立竹密度为114～141株·丛^-1，处于竹丛演替中后期．

英文摘要：

The community structure and distribution of secondary riparian Bambusa rigida in lowerGongjiang River were studied by the transect sampling method and reverse age-class addition. Thespecies in tree and shrub layers in the riparian B. rigida community had the strong native trait.Along the river gradient, the associated species in tree and shrub layers were fragmented, and associated with shore highland plants, suggesting that their distribution did not meet the RCC theory ofcontinuous riparian law. Plant species in herb layer was in accordance with the RCC law, and thespecies abundance in lower reach was the greatest with 29 families, 55 genera, and 70 species.B. rigida was absolutely dominant in the riparian communities and adapted to the regulation of treedensity and physiological integration. The proliferation ratio of B. rigida rapidly decreased to become stabilized, and the degree of its clump dispersion pattern gradually increased. The averagedensity of secondary riparian B. rigida was 114-141 bamboo trees per clump, and the communitywas in the mid-and late succession stage.