Impact of atmospheric N deposition on inorganic- and organic-N outputs in water draining from peat

Yesmin, Laila; Gammack, Shimma M.; Sanger, L.J.; Cresser, Malcolm S.

doi:10.1016/0048-9697(95)04532-6

Cited by 29 publications

(14 citation statements)

References 26 publications

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“…This is similar to findings in other studies (Yesmin et al, 1995;Pregitzer et al, 2004;Helliwell et al, 2007a). Pregitzer et al (2004) observed a dramatic increase in solution DON/DOC and NO 3 -N from hardwood forests plots with chronic NO 3 -N addition.…”

Section: N and C Dynamicssupporting

confidence: 92%

“…Although DIN is expected to constitute a greater proportion of TDN in areas with long-term high atmospheric inorganic N deposition (Allott et al, 1995), the relative importance of organic N accumulation in peat-dominated ecosystems may vary along a deposition gradient, depending on direct biomass uptake of atmospheric N, and the rate of litter decomposition (Yesmin et al, 1995). Over a period of time, high atmospheric inorganic N deposition may alter the soil microbial processing of organic matter (OM) and/or the availability of organic substrates that lead to DON/dissolved organic carbon (DOC) formation, resulting in marked losses of DON/DOC to the fluvial environment (Pregitzer et al, 2004), especially under storm conditions (Clark et al, 2007;Inamdar and Mitchell, 2007).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: N and C Dynamicssupporting

confidence: 92%

Section: Introductionmentioning

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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“…The South Pennine region receives the highest N deposition in the study and the greatest export of DON; almost double that of the Galloway, Mournes, Snowdonia regions. This finding supports the work of Yesmin et al (1995) who observed enhanced leaching of DON from ombrotrophic peat microcosms collected from nine sites along an increasing N deposition gradient (2-17 kg N ha −1 yr −1 ) in Britain. However it should be noted that the South Pennine catchments also had the highest average proportion of blanket peat, and surface waters also had the highest DOC concentrations.…”

Section: Relationship Between Seasonal No 3 As a Ratio Of Total Acidisupporting

confidence: 92%

Spatial and Seasonal Variations in Nitrogen Leaching and Acidity across Four Acid-impacted Regions of the UK

Helliwell¹,

Davies

Evans

et al. 2007

Water Air Soil Pollut

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This study examines the seasonal variability in levels of nitrogen (N) leaching and acidity in four acid impacted upland regions of the UK: the South Pennines, Snowdonia, Galloway and the Mourne Mountains. All regions are acidified, with median pH values of <5.5. The South Pennines exhibit excess sulphate concentrations an order of magnitude higher than those for other regions and have the lowest pH values of all the regions. Nitrate concentrations are highest in the South Pennines (seasonal medians 20-26 μeq l −1 ) and the Mourne Mountains (seasonal medians 9-26 μeq l −1 ). Surface water in the Mourne Mountains is the most highly N impacted in terms of the proportional contribution of N to acidity. All N species exhibit seasonality, with greater retention by catchment soils and vegetation in August. This seasonality is most marked in Snowdonia and least marked in the South Pennines. This implies that the South Pennines have reached an advanced stage of N saturation. Despite the reductions in S deposition, xSO 4 is the dominant anion for all sites in the South Pennine and Snowdonia regions. A strong negative relationship between the contribution of NO 3 to total acidity and DON was observed for all regions except the South Pennines. It is hypothesized that catchments dominated by organic rich soils produced more DON and have an increased capacity to immobilise NO 3 . Seasonal nitrogen budgets show that over 60% of the N inputs are retained within catchments, and no site retains all incoming N throughout the year.

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“…The majority of conservation quality grasslands in the UK arise from the period prior to 1939 and the introduction of largescale mechanisation and artificial fertiliser and pesticide application. In addition, soil fertility has been shown to have increased from atmospheric sources (Bobbink, Hornung, & Roelofs, 1998;Yesmin, Gammack, Sanger, & Cresser, 1995). Thus, projects now seeking to create new grassland and heathland have to contend with greatly changed soil chemistry, and soil structure problems exacerbated by our modern ability to deep plough, as well as a more fragmented and species-poor countryside.…”

Section: Article In Pressmentioning

confidence: 96%

The creation of compensatory habitat—Can it secure sustainable development?

Morris

Alonso

Jefferson

et al. 2006

Journal for Nature Conservation

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Impact of atmospheric N deposition on inorganic- and organic-N outputs in water draining from peat

Cited by 29 publications

References 26 publications

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

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

Spatial and Seasonal Variations in Nitrogen Leaching and Acidity across Four Acid-impacted Regions of the UK

The creation of compensatory habitat—Can it secure sustainable development?

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