Gross nitrogen transformations in the organic layer of acid forest ecosystems subjected to increased atmospheric nitrogen input

Tietema, Albert; Wessel, Wim W.

doi:10.1016/0038-0717(92)90021-o

Cited by 101 publications

(53 citation statements)

References 16 publications

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“…The differences in nitrogen dynamics in Douglas fir needle litter during the first 2 years of decomposition between Leuvenum and Speuld are underlined by comparative studies of nitrogen cycling and microbial activity in the whole ectorganic (LFH) layer. Tietema & Wessel (1992) measured lower gross nitrogen transformation rates and thus a lower nitrogen turnover rate in Leuvenum, and Tietema et al (1992b) found a lower respiration rate in Leuvenum compared to Speuld. The different nitrogen dynamics in the Douglas fir needle litter must be due to site specific environmental factors as the needle litters have a comparable quality.…”

Section: Discussionmentioning

confidence: 95%

Mass loss and nitrogen dynamics in decomposing acid forest litter in the Netherlands at increased nitrogen deposition

Tietema

1993

Biogeochemistry

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Abstract. Litterbag experiments were carried out in five forest ecosystems in the Netherlands to study weight loss and nitrogen dynamics during the first two years of decomposition of leaf and needle litter. All forests were characterized by a relatively high atmospheric nitrogen input by throughfall, ranging from 22-55 kg N ha-' yr-'.Correlation analysis of all seven leaf and needle litters revealed no significant relation between the measured litter quality indices (nitrogen and lignin concentration, lignin-tonitrogen ratio) and the decomposition rate. A significant linear relation was found between initial lignin-to-nitrogen ratio and critical nitrogen concentration, suggesting an effect of litter quality on nitrogen dynamics.Comparison of the decomposition of oak leaves in a nitrogen-limited and a nitrogensaturated forest suggested an increased nitrogen availability. The differences in capacities to retain atmospheric nitrogen inputs between these two sites could be explained by differences in net nitrogen immobilization in first year decomposing oak leaves: in the nitrogenlimited oak forest a major part (55%) of the nitrogen input by throughfall was immobilized in the first year oak leaf litter.The three coniferous forests consisted of two monocultures of Douglas fir and a mixed stand of Douglas fir and Scats pine. Despite comparable litter quality in the Douglas fir needles in all sites, completely different nitrogen dynamics were found.

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Section: Discussionmentioning

confidence: 95%

Mass loss and nitrogen dynamics in decomposing acid forest litter in the Netherlands at increased nitrogen deposition

Tietema

1993

Biogeochemistry

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“…If necessary, data were ln transformed to obtain homogeneity of variances. Since the reduction of NO 3 − to N 2 or NH 4 + is a linear process (as long as no substrate is limited) and no pool dilution of the enriched potassium nitrate occurred under anoxic conditions, it was not necessary to use a simulation model [28,29]. Differences in the percentages of 15 N pools were arcsin-(sqrt) transformed.…”

Section: Discussionmentioning

confidence: 99%

The Fate of 15 N-Nitrate in Healthy and Declining Phragmites australis Stands

Nijburg

Laanbroek

1997

Microbial Ecology

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A B S T R A C TThe dissimilatory nitrate-reducing processes, denitrification, and dissimilatory nitrate-reduction to ammonium were studied in freshwater lake sediments within healthy and degrading Phragmites australis The nitrate reduction rates were calculated based on an incubation period of one hour. The denitrification rate in sediment from the degrading vegetation site was higher than from the healthy vegetation site. The rate of dissimilatory nitrate reduction to ammonium was almost tenfold higher in sediment from the degrading vegetation site compared to sediment from the healthy vegetation site. The significantly lower percentages of dissimilatory nitrate reduction to ammonium and denitrification in the healthy stand compared to the degrading stand was probably due to the presence of roots and rhizomes.In the sediments of healthy and degrading P. australis stands, denitrification was the main nitratereducing process.Publication nr. 2202 NIOO-CTO.

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“…Both coniferous forests differed in nitrification rate, net mineralization rate and respiration rate. Tietema and Wessel (1992) determined the gross nitrogen transformations in litter from both sites and found lower gross nitrogen transformations in the litter from the Leuvenum site. This difference was attributed to the lower litter quality in the Leuvenum litter.…”

Section: Discussionmentioning

confidence: 99%

Abiotic factors regulating nitrogen transformations in the organic layer of acid forest soils: Moisture and pH

et al. 1992

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The relationships between nitrogen transformations and moisture and pH in coniferous forest litter were determined using laboratory incubation experiments.A linear relation between gravimetric moisture content and nitrification was found within the whole studied range of moisture conditions (10-290% ODW). Net nitrogen mineralization increased linearly with moisture content up to 140% ODW. At higher moisture contents, net mineralization was found to be independent of moisture. Relative nitrification was found to be a linear function of moisture content. The dependence of the CO 2 production rates on moisture in the coniferous litter decreased from low to high moisture availability. Due to a nearly linear relationship between gravimetric moisture content and log-(water potential) within the investigated moisture range, the same type of relationships were found with this latter parameter as well. The relationship between nitrogen transformations and pH was studied by means of the addition of different amounts of HC1 and NaOH during short incubation experiments (1 week). Nitrification was found to be a negative linear function of the H-ion concentration within the range of 0.04 (pH 4.40) and 0.36 (pH 3.45) mmol H-ion L -1. At a higher H-ion concentration and thus at a lower pH than 3.45, no nitrate was produced any more. No relationship between net mineralization and pH was found.

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Gross nitrogen transformations in the organic layer of acid forest ecosystems subjected to increased atmospheric nitrogen input

Cited by 101 publications

References 16 publications

Mass loss and nitrogen dynamics in decomposing acid forest litter in the Netherlands at increased nitrogen deposition

Mass loss and nitrogen dynamics in decomposing acid forest litter in the Netherlands at increased nitrogen deposition

The Fate of 15 N-Nitrate in Healthy and Declining Phragmites australis Stands

Abiotic factors regulating nitrogen transformations in the organic layer of acid forest soils: Moisture and pH

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