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Nitrogen biogeochemistry of a mature Scots pine forest subjected to high nitrogen loads

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Nitrogen biogeochemistry of a mature Scots pine forest subjected to high nitrogen loads. / Neirynck, Johan; Janssens, I.A.; Roskams, Peter; Quataert, Paul; Verschelde, Pieter; Ceulemans, R.

In: Biogeochemistry, Vol. 91, 2008, p. 201-222.

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@article{adceb1bc72b04dd1ad67ee81be6efdb4,
title = "Nitrogen biogeochemistry of a mature Scots pine forest subjected to high nitrogen loads",
abstract = "Nitrogen (N) biogeochemistry of a mature Scots pine (Pinus sylvestris L.) stand subjected to an average total atmospheric N deposition of 48 kg ha-1 yr-1 was studied during the period 1992-2007. The annual amount of dissolved inorganic nitrogen (DIN) in throughfall (TF) averaged 34 kg ha-1 yr-1 over the 16-year monitoring period. The throughfall fluxes contained also considerable amounts of dissolved organic nitrogen (DON) (5-8.5 kg N ha-1 yr-1), which should be incorporated in the estimate of N flux using throughfall collectors. Throughfall DIN fluxes declined at a rate of -0.9 kg N ha-1 yr-1, mainly due to the decreasing TF fluxes of ammonium (NH4), which accounted for 70{\%} to TF DIN. The decrease in TF DIN was accompanied by a decrease in DIN leaching in the seepage water (-1.6 kg N ha-1 yr-1), which occurred exclusively as nitrate (NO3-). Nitrate losses in the leachate of the forest floor (LFH) equalled the TF NO3- delivered to the LFH-layer. On the contrary, about half of the TF NH4+ was retained within the LFH-layer. Approximately 60 {\%} of the TF DIN fluxes were leached indicating that N inputs were far in excess of the N requirements of the forest. For DON, losses were only substantial from the LFH-layer, but no DON was leached in the seepage water. Despite the high N losses through nitrate leaching and NOx emission, the forest was still accumulating N, especially in the aggrading LFH-layer. The forest stand, on the contrary, was found to be a poor N sink.",
author = "Johan Neirynck and I.A. Janssens and Peter Roskams and Paul Quataert and Pieter Verschelde and R Ceulemans",
year = "2008",
language = "Nederlands",
volume = "91",
pages = "201--222",
journal = "Biogeochemistry",
issn = "0168-2563",
publisher = "Springer Science+Business Media",

}

RIS

TY - JOUR

T1 - Nitrogen biogeochemistry of a mature Scots pine forest subjected to high nitrogen loads

AU - Neirynck, Johan

AU - Janssens, I.A.

AU - Roskams, Peter

AU - Quataert, Paul

AU - Verschelde, Pieter

AU - Ceulemans, R

PY - 2008

Y1 - 2008

N2 - Nitrogen (N) biogeochemistry of a mature Scots pine (Pinus sylvestris L.) stand subjected to an average total atmospheric N deposition of 48 kg ha-1 yr-1 was studied during the period 1992-2007. The annual amount of dissolved inorganic nitrogen (DIN) in throughfall (TF) averaged 34 kg ha-1 yr-1 over the 16-year monitoring period. The throughfall fluxes contained also considerable amounts of dissolved organic nitrogen (DON) (5-8.5 kg N ha-1 yr-1), which should be incorporated in the estimate of N flux using throughfall collectors. Throughfall DIN fluxes declined at a rate of -0.9 kg N ha-1 yr-1, mainly due to the decreasing TF fluxes of ammonium (NH4), which accounted for 70% to TF DIN. The decrease in TF DIN was accompanied by a decrease in DIN leaching in the seepage water (-1.6 kg N ha-1 yr-1), which occurred exclusively as nitrate (NO3-). Nitrate losses in the leachate of the forest floor (LFH) equalled the TF NO3- delivered to the LFH-layer. On the contrary, about half of the TF NH4+ was retained within the LFH-layer. Approximately 60 % of the TF DIN fluxes were leached indicating that N inputs were far in excess of the N requirements of the forest. For DON, losses were only substantial from the LFH-layer, but no DON was leached in the seepage water. Despite the high N losses through nitrate leaching and NOx emission, the forest was still accumulating N, especially in the aggrading LFH-layer. The forest stand, on the contrary, was found to be a poor N sink.

AB - Nitrogen (N) biogeochemistry of a mature Scots pine (Pinus sylvestris L.) stand subjected to an average total atmospheric N deposition of 48 kg ha-1 yr-1 was studied during the period 1992-2007. The annual amount of dissolved inorganic nitrogen (DIN) in throughfall (TF) averaged 34 kg ha-1 yr-1 over the 16-year monitoring period. The throughfall fluxes contained also considerable amounts of dissolved organic nitrogen (DON) (5-8.5 kg N ha-1 yr-1), which should be incorporated in the estimate of N flux using throughfall collectors. Throughfall DIN fluxes declined at a rate of -0.9 kg N ha-1 yr-1, mainly due to the decreasing TF fluxes of ammonium (NH4), which accounted for 70% to TF DIN. The decrease in TF DIN was accompanied by a decrease in DIN leaching in the seepage water (-1.6 kg N ha-1 yr-1), which occurred exclusively as nitrate (NO3-). Nitrate losses in the leachate of the forest floor (LFH) equalled the TF NO3- delivered to the LFH-layer. On the contrary, about half of the TF NH4+ was retained within the LFH-layer. Approximately 60 % of the TF DIN fluxes were leached indicating that N inputs were far in excess of the N requirements of the forest. For DON, losses were only substantial from the LFH-layer, but no DON was leached in the seepage water. Despite the high N losses through nitrate leaching and NOx emission, the forest was still accumulating N, especially in the aggrading LFH-layer. The forest stand, on the contrary, was found to be a poor N sink.

M3 - A1: Web of Science-artikel

VL - 91

SP - 201

EP - 222

JO - Biogeochemistry

JF - Biogeochemistry

SN - 0168-2563

ER -

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