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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Control of sediment dynamics by vegetation as a key function driving biogeomorphic succession within fluvial corridors
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Control of sediment dynamics by vegetation as a key function driving biogeomorphic succession within fluvial corridors

机译：通过植被控制泥沙动力学是驱动河流走廊生物地貌演替的关键功能

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Riparian vegetation responds to hydrogeomorphic disturbances and environmental changes and also controls these changes. Here, we propose that the control of sediment erosion and deposition by riparian vegetation is a key geomorphological and ecological (i.e. biogeomorphic) function within fluvial corridors. In a 3 year study, we investigated the correlations between riparian vegetation and hydrogeomorphic dynamics along a transverse gradient from the main channel to the floodplain of the River Tech, France. Sediment erosion and deposition rates varied significantly along the transverse gradient as a function of the vegetation biovolume intercepting water flow. These effects, combined with the extremely strong mechanical resistance of pioneer woody structures and strong resilience of pioneer labile herbaceous communities, Populus nigra and Salix spp., explain the propensity of biogeomorphic succession (i.e. the synergy between vegetation succession and landform construction) to progress between destructive floods. This geomorphological function newly identified as an 'ecosystem function' per se encompasses the coupling of habitat and landform creation, maintenance and change with fundamental ecosystem structural changes in space and in time. Three different biogeomorphic functions, all related to the concept of ecosystem engineering, were identified: (i) the function of pioneer herbaceous communities to retain fine sediment and diaspores in the exposed zones of the active tract near the water resource, facilitating recruitment of further herbaceous and Salicacea species; (ii) the function of woody vegetation to drive the construction of forested islands and floodplains; and (iii) the function of stabilised riparian forests to act as 'diversity reservoirs' which can support regeneration after destructive floods. Overall, this study based on empirical data points to the fundamental importance of sediment flow control by pioneer riparian vegetation in defining fluvial ecosystem and landform organisation in time and in space.
机译：河岸植被对水文地貌干扰和环境变化做出响应，并控制这些变化。在这里，我们提出控制河岸植被对沉积物的侵蚀和沉积的控制是河流走廊内重要的地貌和生态（即生物地貌）功能。在一项为期3年的研究中，我们调查了沿河从法国主要河道至洪泛区的横向坡度的河岸植被与水力地貌动力学之间的相关性。沉积物侵蚀和沉积速率沿横向梯度变化很大，这是植被生物量拦截水流的函数。这些影响，再加上先锋木本结构极强的机械抵抗力和先锋不稳定草类群落（黑杨和柳树种）的强韧性，解释了生物地貌演替的倾向（即植被演替与地貌建设之间的协同作用）之间的发展趋势。破坏性的洪水。这种新近被识别为“生态系统功能”的地貌功能包括栖息地和地貌的创造，维持和变化与生态系统在空间和时间上的基本变化的耦合。确定了三种不同的生物地貌功能，都与生态系统工程的概念有关：（i）先锋草类群落在靠近水资源的活动区裸露区域中保留细小沉积物和硬孢子的功能，有利于补充更多草类和水杨属; （ii）木本植物在推动森林岛屿和洪泛区建设方面的功能; （iii）稳定的河岸森林起着“多样性水库”的作用，可以支持破坏性洪水后的再生。总体而言，这项基于经验数据的研究指出，先驱河岸植被控制沉积物流量在确定河流生态系统和地貌组织在时间和空间上的根本重要性。

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