Nitrogen cycling in two riparian forest soils under different geomorphic conditions

Pinay, Gilles; Ruffinoni, Charles; Fabre, André

doi:10.1007/bf02181038

Cited by 125 publications

(95 citation statements)

References 60 publications

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“…For example, differences in soil texture, soil moisture, flooding frequency, and soil N concentrations, driven largely by flooding disturbance history, had large impacts on plant community composition along the Snake River in Idaho (Merigliano 2005). In our study, the effect of N on plant community composition may have been complicated by differences in soil texture (Bechtold and Naiman 2006), denitrification rates, and plant N uptake among riparian geomorphic surfaces (Pinay et al 1995). However, soil texture (% sand) was not included as an explanatory factor in any of our best models and was only included in two second-best models (exotic cover in 2010 and 2011).…”

Section: Discussionmentioning

confidence: 72%

Cottonwood understory zonation and its relation to floodplain stratigraphy

Merigliano

2005

Wetlands

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Section: Discussionmentioning

confidence: 72%

Cottonwood understory zonation and its relation to floodplain stratigraphy

Merigliano

2005

Wetlands

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“…A paired study comparing riparian soils with different texture but exposed to the same flood regime showed minimal denitrification for <65% of silt and clay content, while above that threshold, denitrification increased linearly (Pinay et al, 1995(Pinay et al, , 2000. Similarly, significant nonlinear relationships have been also found, for instance, between denitrification rates and soil texture in floodplains across Europe and elsewhere, with fine textured soils (i.e., high in silt and clay) being more prone to denitrification (e.g., Pinay et al, 2007;Malone et al, 2018).…”

Section: Riparian Corridors Function As Kidneys Of River Systemsmentioning

confidence: 99%

“…Indeed constant humid conditions maintain soil moisture to a high percentage of saturation promoting the coexistence of aerobic and anaerobic microsites, which favor both nitrification and denitrification (Hefting et al, 2004). Under temperate conditions, strong seasonal shifts in rainfall and soil moisture patterns entail a decrease in denitrification activity in riparian zones along larger streams (Pinay et al, 1995(Pinay et al, , 2000Tabacchi et al, 1998). Based on existing published data, we forecast that denitrification is not significant in riparian zones along low stream order streams under Mediterranean, arid or arctic climate due to low water availability and/or short residence time of water and solutes (Jones et al, 2005;Bernal et al, 2007;Mu et al, 2017;Poblador et al, 2017).…”

Section: Riparian Corridors Function As Kidneys Of River Systemsmentioning

confidence: 99%

Riparian Corridors: A New Conceptual Framework for Assessing Nitrogen Buffering Across Biomes

Pinay

Bernal

Abbott

et al. 2018

Front. Environ. Sci.

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Anthropogenic activities have more than doubled the amount of reactive nitrogen circulating on Earth, creating excess nutrients across the terrestrial-aquatic gradient. These excess nutrients have caused worldwide eutrophication, fundamentally altering the functioning of freshwater and marine ecosystems. Riparian zones have been recognized to buffer diffuse nitrate pollution, reducing delivery to aquatic ecosystems, but nutrient removal is not their only function in river systems. In this paper, we propose a new conceptual framework to test the capacity of riparian corridors to retain, remove, and transfer nitrogen along the continuum from land to sea under different climatic conditions. Because longitudinal, lateral, and vertical connectivity in riparian corridors influences their functional role in landscapes, we highlight differences in these parameters across biomes. More specifically, we explore how the structure of riparian corridors shapes stream morphology (the river's spine), their multiple functions at the interface between the stream and its catchment (the skin), and their biogeochemical capacity to retain and remove nitrogen (the kidneys). We use the nitrogen cycle as an example because nitrogen pollution is one of the most pressing global environmental issues, influencing directly and indirectly virtually all ecosystems on Earth. As an initial test of the applicability of our interbiome approach, we present synthesis results of gross ammonification and net nitrification from diverse ecosystems.

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“…In this sense, the alluvial aquifer acts as a wellmixed groundwater reservoir and can exhibit a chemical signature distinct from hillslope groundwater (Hooper et al, 1998). Moreover, the alluvial zone can strongly affect nearstream subsurface hydrology, and thus the ability of riparian zones to regulate solute fluxes (Pinay et al, 1995;Hill et al, 2004). When the stream and riparian zone are surrounded by an alluvium with a large fraction of coarse material (hereafter, the alluvial riparian zone), high hydraulic conductivity can favour the mixing of surface-subsurface water bodies and modify stream flow as well as stream chemistry in many different ways (e.g.…”

Section: Introductionmentioning

confidence: 99%

Changes in discharge and solute dynamics between hillslope and valley-bottom intermittent streams

Bernal

Sabater

2012

Hydrol. Earth Syst. Sci.

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Abstract. To gain understanding on how alluvial zones modify water and nutrient export from semiarid catchments, we compared monthly discharge as well as stream chloride, carbon, and nitrogen dynamics between a hillslope catchment and a valley-bottom catchment with a well-developed alluvium. Stream water and solute fluxes from the hillslope and valley-bottom catchments showed contrasting patterns between hydrological transitions and wet periods, especially for bio-reactive solutes. During transition periods, stream water export decreased >40 % between the hillslope and the valley bottom coinciding with the prevalence of streamto-aquifer fluxes at the alluvial zone. In contrast, stream water export increased by 20-70 % between the hillslope and valley-bottom catchments during wet periods. During transition periods, stream solute export decreased by 34-97 % between the hillslope and valley-bottom catchments for chloride, nitrate, and dissolved organic carbon. In annual terms, stream nitrate export from the valley-bottom catchment (0.32 ± 0.12 kg N ha −1 yr −1 [average ± standard deviation]) was 30-50 % lower than from the hillslope catchment (0.56 ± 0.32 kg N ha −1 yr −1 ). The annual export of dissolved organic carbon was similar between the two catchments (1.8 ± 1 kg C ha −1 yr −1 ). Our results suggest that hydrological retention in the alluvial zone contributed to reduce stream water and solute export from the valley-bottom catchment during hydrological transition periods when hydrological connectivity between the hillslope and the valley bottom was low.

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Nitrogen cycling in two riparian forest soils under different geomorphic conditions

Cited by 125 publications

References 60 publications

Cottonwood understory zonation and its relation to floodplain stratigraphy

Cottonwood understory zonation and its relation to floodplain stratigraphy

Riparian Corridors: A New Conceptual Framework for Assessing Nitrogen Buffering Across Biomes

Changes in discharge and solute dynamics between hillslope and valley-bottom intermittent streams

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