Nitrogen additions (NaNO3 and NH4NO3) at Aber forest, Wales: I. Response of throughfall and soil water chemistry

Emmett, Bridget A.; Brittain, S. A.; Hughes, S.; Görres, Josef H.; Kennedy, V. H.; Norris, Dave; Rafarel, R.; Reynolds, B.; Stevens, P.A.

doi:10.1016/0378-1127(94)06083-u

Cited by 79 publications

(23 citation statements)

References 26 publications

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“…Results confirm that, in those systems where increased additions lead to increased nitrate mobility, this will be accompanied by losses of nutrient cations and increases in soil and water acidity (e.g. Emmett et al, 1995;Boxman et al, 1995;Kahl et al, 1993;McNulty and Aber, 1993a). Data have also been presented suggesting that excess N availability can lead to nutrient imbalances in trees, expressed as root or foliar element ratios, especially Ca:Al and Mg:N. Such imbalances have been linked to reductions in net photosynthesis, photosynthetic N use efficiency, forest gjowth, and even to tree mortality (Schulze, 1989;Shortle and Smith, 1988;Richter et 'al, 1992;Friedland et al, 1988;McNulty and Aber, 1993;Cronan and Grigal, 1995).…”

Section: Introductionsupporting

confidence: 65%

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Forest biogeochemistry and primary production altered by nitrogen saturation

Aber

Magill

McNulty

et al. 1995

Water Air Soil Pollut

225

137

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Results from four intensive she-level manipulations and one extensive field survey in northern temperate and boreal forests show a consistent set of responses to chronic N additions. These include 1) initial and often large increase in net N mineralization followed by decreases, 2) increases in net nitrification. 3) increases in N concentration in foliage, and 4) decreased Mg:N and Ca:Al ratios, and declining tree growth and vigor in all evergreen stands. These results are synthesized into a set of proposed summary relationships that define the temporal pattern of responses of N-limited systems to N additions.

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Section: Introductionsupporting

confidence: 65%

“…Wright and van Breeman, 1995;Emmett et al, 1995, Boxman et al, 1995Wright and Tietema, 1995;Gundersen and Rasmussen, 1995). The purpose of this paper is to synthesize the results of the first 7 years of results from these experiments.…”

Section: Introductionmentioning

confidence: 99%

Forest biogeochemistry and primary production altered by nitrogen saturation

Aber

Magill

McNulty

et al. 1995

Water Air Soil Pollut

225

137

View full text Add to dashboard Cite

show abstract

“…Ascutney, Vermont, and at the Harvard Forest in Massachusetts and studies across an N deposition gradient in New England parallel and complement the NITREX (nitrogen saturation experiments) in Europe (Boxman et al 1995, Emmett et al 1995, Gundersen and Rasmussen 1995, Wright and Tietema 1995, Wright and van Breeman 1995. Several measured responses to chronic N additions were consistent across all sites , Magill et al 1996.…”

Section: New England Forestsmentioning

confidence: 89%

Nitrogen Excess in North American Ecosystems: Predisposing Factors, Ecosystem Responses, and Management Strategies

Fenn¹,

Poth²,

Aber³

et al. 1998

Ecological Applications

328

492

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Abstract. Most forests in North America remain nitrogen limited, although recent studies have identified forested areas that exhibit symptoms of N excess, analogous to overfertilization of arable land. Nitrogen excess in watersheds is detrimental because of disruptions in plant/soil nutrient relations, increased soil acidification and aluminum mobility, increased emissions of nitrogenous greenhouse gases from soil, reduced methane consumption in soil, decreased water quality, toxic effects on freshwater biota, and eutrophication of coastal marine waters. Elevated nitrate ( ) loss to groundwater Ϫ

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“…The large range of NH,+ fluxes in throughfall may mask a relationship between NO3 in throughfall and system nitrogen concentrations. Manipulation experiments with nitrogen deposition show that in systems leaking NO, , the flux of N out is more closely related to flux of NO, rather than NH,+ in throughfall (Gundersen and Rasmussen, 1995;Emmett et al, 1995). This implies that NH,+ inputs have a larger relative contribution to internal ecosystem changes than NO, inputs.…”

Section: Nitrogen Input Vs System Nitrogen Concentrationsmentioning

confidence: 99%

A correlative evaluation of nitrogen cycling in the forest ecosystems of the EC projects NITREX and EXMAN

Tietema

Beier²

1995

Forest Ecology and Management

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Results from two EC ecosystem manipulation projects (NITREX and EXMAN) were integrated by a correlation analysis. The analysis focused on ambient nitrogen input and output and on the nitrogen concentrations in various compartments of the ecosystems. The dataset included 12 sites ( 11 coniferous forests and one alpine vegetation) covering a range of atmospheric nitrogen inputs from 3 to 60 kg N ha-' year-'. Nitrogen input by precipitation and by throughfall were highly positively correlated, although the regressions differed for sites at which NO< deposition dominates compared with sites at which NH,+ dominates. In general, nitrogen concentrations in needles, in needle litterfall and in the organic layer, as well as in drainage, were more closely correlated to nitrogen input in precipitation than throughfall. Variations in nitrogen concentrations in needles, in needle litterfall and in the organic layer explained 96% of the variation in nitrogen output.

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Nitrogen additions (NaNO3 and NH4NO3) at Aber forest, Wales: I. Response of throughfall and soil water chemistry

Cited by 79 publications

References 26 publications

Forest biogeochemistry and primary production altered by nitrogen saturation

Forest biogeochemistry and primary production altered by nitrogen saturation

Nitrogen Excess in North American Ecosystems: Predisposing Factors, Ecosystem Responses, and Management Strategies

A correlative evaluation of nitrogen cycling in the forest ecosystems of the EC projects NITREX and EXMAN

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