Feedbacks between the riparian Salicaceae and hydrogeomorphic processes: A quantitative review

Politti, Emilio; Bertoldi, Walter; Gurnell, Angela M.; Henshaw, Alex

doi:10.1016/j.earscirev.2017.07.018

Cited by 53 publications

(43 citation statements)

References 157 publications

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“…Growth and survival of seedlings then depends on how they respond to, and are adapted to cope with, flooding (Garssen et al, 2015). Long periods of inundation can inhibit plant growth limiting plant photosynthetic activity by submerging plant's canopy (Politti et al, 2018) and by depleting oxygen in the root zone (Friedman and Auble, 1999). Droughts can cause mortality by reducing soil moisture and pore water availability for root uptake (e.g., Mahoney and Rood, 1998;Johnson, 2000;Francis et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

When Does Vegetation Establish on Gravel Bars? Observations and Modeling in the Alpine Rhine River

Caponi

Koch

Bertoldi

et al. 2019

Front. Environ. Sci.

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Section: Introductionmentioning

confidence: 99%

When Does Vegetation Establish on Gravel Bars? Observations and Modeling in the Alpine Rhine River

Caponi

Koch

Bertoldi

et al. 2019

Front. Environ. Sci.

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“…Interacting physical and biological processes in river-floodplain systems shape ecosystems and channels (Naiman and Decamps, 1997;Gurnell, 2014;Politti et al, 2018). Vegetation influences hydraulics, sediment erosion and deposition (López and García, 1998;Neumeier and Ciavola, 2004;Bouma et al, 2007;Nepf, 2012;Manners et al, 2015), and channel morphology (Gran and Paola, 2001;Simon and Collison, 2002).…”

Section: Introductionmentioning

confidence: 99%

Riparian Vegetation and Sediment Supply Regulate the Morphodynamic Response of an Experimental Stream to Floods

Lightbody

Stella

et al. 2019

Front. Environ. Sci.

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Feedbacks between woody plants and fluvial morphodynamics result in co-development of riparian vegetation communities and channel form. To advance mechanistic knowledge regarding these interactions, we measured the response of topography and flow to the presence of riparian tree seedlings with contrasting morphologies in an experimental, field-scale, meandering stream channel with a mobile sand bed. On a convex point bar, we installed seedlings of Tamarix spp. (tamarisk) and Populus fremontii (cottonwood) with intact roots and simulated a bankfull flood, with each of eight runs varying sediment supply, plant density, and plant species. Vegetation reduced turbulence and velocities on the bar relative to bare-bed conditions, inducing sediment deposition when vegetation was present, regardless of vegetation density or species. Sediment supply also played a dominant role, and eliminating sediment supply reduced deposition regardless of the presence of vegetation. Unexpectedly, plant density and species architecture (shrubby tamarisk vs. single-stemmed cottonwood) had only a secondary influence on hydraulics and sediment transport. In the absence of plants, mobile bedforms were prominent across the bar, but vegetation of all types decreased the height and lateral extent of bedforms migrating across the bar, suggesting a mechanism by which vegetation modulates feedbacks among sediment transport, topography, and hydraulics. Our measurements and resulting insights bridge the gap between laboratory conditions and real dryland sand-bed rivers and motivate further morphodynamic modeling.

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“…Therefore, the restoration and maintenance of riparian ecosystem function has become a central and urgent need in geographical and ecological research [3]. At present, most researchers focus on the corridor [5], buffer [6] and revetment functions [7] of the riparian ecosystem, and carried 2 of 16 out studies on riparian structural features [8,9], biodiversity conservation and influencing factors [5], prevention and control of non-point source pollution [6] and riparian maintenance and soil erosion prevention [7,10,11]. However, compared to riparian biodiversity and agricultural non-point source pollution control mechanisms, soil erosion control of the riparian zone remains poorly understood.…”

Section: Introductionmentioning

confidence: 99%

Inhibiting Effects of Vegetation on the Characteristics of Runoff and Sediment Yield on Riparian Slope along the Lower Yellow River

et al. 2019

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Riparian vegetation plays a vital role in soil and water conservation and river health maintenance. However, its inhibiting effects on water and soil loss are limited by different factors, such as slope gradient, vegetation coverage and their interaction. Therefore, this study quantified the inhibiting effect of riparian vegetation on the runoff, sediment and hydraulic characteristics of overland flow, and assessed its relative contribution to slope gradient. Specifically, we selected a riparian slope along the lower Yellow River as a case, and used a field-simulated rainfall experiment under specific rainfall intensity (90 mm/h), different vegetation coverage (0%, 15% and 30%) and slope gradients (5°, 10°, 15° and 20°). The results showed that the presence of vegetation can reduce the slope runoff rate and erosion rate. However, greater slope gradients can result in a lowering of the inhibiting effects of riparian vegetation on sediment yield. There was a critical value of vegetation coverage for inhibiting eroded sediments which was influenced by the degree of slope gradient. At 15% vegetation coverage, vegetation inhibited the slope sediment yield greatly at a slope gradient of less than 8°; while at 30% vegetation coverage, vegetation greatly inhibited the slope sediment yield at slope gradients <11°. Hydraulic characteristics were closely related to the slope gradient and vegetation coverage by the power function. Grey correlation analysis revealed that, with increasing of vegetation coverage, the effect of stream power on slope sediment yield decreased, while the effect of the friction coefficient on slope sediment yield increased. In summary, riparian vegetation can effectively inhibit slope runoff and sediment yield, but its inhibiting effect is notably affected by slope gradient.

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Feedbacks between the riparian Salicaceae and hydrogeomorphic processes: A quantitative review

Cited by 53 publications

References 157 publications

When Does Vegetation Establish on Gravel Bars? Observations and Modeling in the Alpine Rhine River

When Does Vegetation Establish on Gravel Bars? Observations and Modeling in the Alpine Rhine River

Riparian Vegetation and Sediment Supply Regulate the Morphodynamic Response of an Experimental Stream to Floods

Inhibiting Effects of Vegetation on the Characteristics of Runoff and Sediment Yield on Riparian Slope along the Lower Yellow River

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