黄河源区弯曲河流滨河植被与河湾迁移的关系  

Relationship between riparian vegetation and migration of a meandering river in the Yellow River Source Region

作　　者：刘桉[1] 刘成[1,2] 冀自青 徐梦珍 李志威[4] 

机构地区：[1]中国水利水电科学研究院,北京100048 [2]国际泥沙研究培训中心,北京100048 [3]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [4]长沙理工大学水利工程学院,湖南长沙410114

出　　处：《水利水电科技进展》2018年第2期57-61,76,共6页Advances in Science and Technology of Water Resources

基　　金：国家国际科技合作专项(2014DFG72010);国家自然科学基金(91547204);黄河水利委员会黄河水利科学研究院研究项目(HKY-JBYW-2016-03)

摘　　要：为了解滨河植被对河湾横向迁移的作用,以及河湾迁移对滨河植被群落分布的影响,对黄河源区兰木错曲弯曲河段崩塌块、凹岸植被生物量和凸岸植被多样性进行现场调查统计,给出了河湾迁移速率的估算方法。结果表明:其迁移速率与凹岸植被生物量呈指数关系;河湾凸岸边滩的泥沙沉积在不同重现期洪水作用下,形成不同的植被条带,对应于5种典型的植被群落;河湾的横向迁移对滨河植被生态系统具有调节作用,形成一种牧草先增多后减少再增多的草场更新机制,原生演替不断循环进行,以维持草场的长期可持续放牧功能。To study the role of riparian vegetation in the lateral migration of a riverbank and the effect of migration on the distribution of vegetation community,in-situ investigation and analysis of vegetation biomass in the slump blooks and vegetation diversity of the convex bank were carried out along the meanders of the Lanmucuo River in the source region of the Yellow River. A method for estimation of the migration rate of the riverbank was proposed. The results indicate that the migration rate is exponentially correlated with the vegetation biomass. Siltation of the convex bank under different recurrence floods formed five different vegetation bands corresponding to five typical vegetation communities. The lateral migration of the river has a moderating effect on the riparian vegetation ecosystem. A pasture regeneration mechanism was formed with a characteristic that the amount of pasture increased first and then decreased. The continuous primary vegetation succession played an important role in maintaining the long-term sustainable grazing function.

关 键 词：弯曲河流 河湾迁移 崩塌块 植被群落 植被演替 黄河源区 

分 类 号：TV147[水利工程—水力学及河流动力学]