N Leaching from Small Upland Headwater Catchments in Southwestern Norway

Sjøeng, Anne Merete S.; Kaste, Øyvind; Tørseth, Kjetil; Mulder, Jan

doi:10.1007/s11270-006-9236-5

Cited by 12 publications

(6 citation statements)

References 41 publications

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“…Site data locations and distributions of mean annual temperature (MAT), soil pH, nitrogen deposition in year 2000, and observed organic topsoil carbon, nitrogen, and phosphorus contents. Data are detailed in the SI, Tables S3–S5 [ Andersson et al , ; Beier et al , ; Berggren et al , ; Blaser et al , ; Bloemerts and Vries , ; Corre and Lamersdorf , ; de Vries et al , ; UKREATE , 2010; DEFRA , 2006; B A Emmett et al , ; Evans et al , ; Gundersen , ; Jackson‐Blake et al , ; Kleja et al , ; Kreutzer et al , ; Lamersdorf and Meyer , ; MacDonald et al , ; Mol‐Dijkstra and Kros , ; Parr et al , ; Pilkington et al , ; I K Schmidt et al , ; Sjøeng et al , ; J D Speed et al , ; J D M Speed et al , ; Tietema et al , ; Tipping et al , ; van Meeteren et al , ; von Oheimb et al , ; Walthert et al , ; Wright et al , ; Zimmermann et al , ].…”

Section: Methodsmentioning

confidence: 99%

Long‐term P weathering and recent N deposition control contemporary plant‐soil C, N, and P

Davies

Tipping

Rowe

et al. 2016

Global Biogeochemical Cycles

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Models are needed to understand how plant-soil nutrient stores and fluxes have responded to the last two centuries of widespread anthropogenic nutrient pollution and predict future change. These models need to integrate across carbon, nitrogen, and phosphorus (C, N, and P) cycles and simulate changes over suitable timescales using available driving data. It is also vital that they are constrainable against observed data to provide confidence in their outputs. To date, no models address all of these requirements. To meet this need, a new model, N14CP, is introduced, which is initially applied to Northern Hemisphere temperate and boreal ecosystems over the Holocene. N14CP is parameterized and tested using 88 northern Europe plot-scale studies, providing the most robust test of such a model to date. The model simulates long-term P weathering, based on the assumption of a starting pool of weatherable P (P weath0 , g m À2 ), which is gradually transformed into organic and sorbed pools. Nitrogen fixation (and consequently primary production) is made dependent on available P. In the absence of knowledge about the spatial variability of P weath0 , N14CP produces good average soil and plant variables but cannot simulate variations among sites. Allowing P weath0 to vary between sites improves soil C, N, and P results greatly, suggesting that contemporary soil C, N, and P are sensitive to long-term P weathering. Most sites were found to be N limited. Anthropogenic N deposition since 1800 was calculated to have increased plant biomass substantially, in agreement with observations and consequently increased soil carbon pools.

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Section: Methodsmentioning

confidence: 99%

Long‐term P weathering and recent N deposition control contemporary plant‐soil C, N, and P

Davies

Tipping

Rowe

et al. 2016

Global Biogeochemical Cycles

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“…Similar to conclusions in the heavily acidified River Etherow catchment in the south Pennines (Curtis et al, 2004), reduced uptake of atmospheric N may encourage the direct leaching of atmospheric N input to the Kinder River. Although inorganic N is expected to be utilised for biological production during the summer months (Kaushal and Lewis, 2003;Sjoeng et al, 2007), seasonal biological control did not significantly influence DIN concentrations, which varied little across seasons in the Kinder River (Table 3). The overall N status and reactivity of the C pool in the catchment may influence its capacity to immobilise inorganic N, with leaching likely to begin at higher C/N ratio in soils with substantial proportion of recalcitrant C than in soils with more labile C pool (Evans et al, 2006a(Evans et al, , 2006bRowe et al, 2006).…”

Section: Doc:don Ratiomentioning

confidence: 99%

High fluvial export of dissolved organic nitrogen from a peatland catchment with elevated inorganic nitrogen deposition

Edokpa

Evans

Rothwell

2015

Science of The Total Environment

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This study investigates seasonal concentrations and fluxes of nitrogen (N) species under stormflow and baseflow conditions in the peat dominated Kinder River catchment, south Pennines, UK. This upland region has experienced decades of high atmospheric inorganic N deposition. Water samples were collected fortnightly over one year, in combination with high resolution stormflow sampling and discharge monitoring. The results reveal that dissolved organic nitrogen (DON) constitutes ~54% of the estimated annual total dissolved nitrogen (TDN) flux (14.3 kg N ha(-1) yr(-1)). DON cycling in the catchment is influenced by hydrological and biological controls, with greater concentrations under summer stormflow conditions. Dissolved organic carbon (DOC) and DON are closely coupled, with positive correlations observed during spring, summer and autumn stormflow conditions. A low annual mean DOC:DON ratio (<25) and elevated dissolved inorganic N concentrations (up to 63μmoll(-1) in summer) suggest that the Kinder catchment is at an advanced stage of N saturation. This study reveals that DON is a significant component of TDN in peatland fluvial systems that receive high atmospheric inputs of inorganic N.

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“…Explanations for these findings are not straight forward, as a number of factors could have potentially contributed to these patterns, including spatial variations in the chemical composition of leaf litter, soil thickness and texture, and N pools. Vegetation density and composition regulate the magnitude of N uptake, and spatial variability in NO 3 − reaching streams has been attributed to differences in vegetation cover within the contributing catchment areas [Kaste et al, 1997;Lovett et al, 2000;Sjoeng et al, 2007]. Disturbances such as defoliation events within catchments can reduce N uptake by vegetation, also leading to greater NO 3 − transport to streams [Lovett et al, 2002;Riscassi and Scanlon, 2009].…”

Section: Introductionmentioning

confidence: 99%

Terrestrial and in‐stream influences on the spatial variability of nitrate in a forested headwater catchment

2010

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A vast majority of monitoring programs designed to assess nutrient fluxes from headwater systems rely upon temporally intensive sampling at a single position within the stream network, essentially measuring the integrated response of the catchment. Missing from such an approach is spatial information related to how nutrient availability varies throughout the network, where freshwater biota live and where biogeochemical processes ultimately shape the downstream water chemistry. Here, we examine the spatial distribution of nitrate (NO3−) concentrations within the Paine Run catchment, a forested headwater catchment in Shenandoah National Park, Virginia. Nitrate concentrations throughout the stream network were measured as part of synoptic surveys conducted in 1992–1994, in the aftermath of region‐wide gypsy moth defoliation that caused dramatic increases in stream water NO3− concentrations. A follow‐up synoptic survey was conducted in 2007, when the stream water NO3− concentrations had returned to predefoliation levels. Common to each of the eight synoptic surveys were observations of multiple‐fold declines in NO3− concentration along the main stem of the stream network from the headwaters to the catchment outlet. A portion of this decline was caused by dilution, as water input by tributaries at the lower elevations of the catchment tended to have lower NO3− concentrations. A stream network model was applied to determine the relative contributions of terrestrial versus in‐stream processes to the spatial variability of the NO3− concentrations. Model results suggest that even though nitrate removal within the stream network can be substantial, terrestrial factors that determine the NO3− inputs to streams account for the vast majority of the spatial variability in stream water NO3− concentrations.

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N Leaching from Small Upland Headwater Catchments in Southwestern Norway

Cited by 12 publications

References 41 publications

Long‐term P weathering and recent N deposition control contemporary plant‐soil C, N, and P

Long‐term P weathering and recent N deposition control contemporary plant‐soil C, N, and P

High fluvial export of dissolved organic nitrogen from a peatland catchment with elevated inorganic nitrogen deposition

Terrestrial and in‐stream influences on the spatial variability of nitrate in a forested headwater catchment

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