Calculating gross N transformation rates of 15N pool dilution experiments with acid forest litter: Analytical and numerical approaches

Wessel, Wim W.; Tietema, Albert

doi:10.1016/0038-0717(92)90020-x

Cited by 86 publications

(41 citation statements)

References 17 publications

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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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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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“…Ammonium and nitrate concentrations in the extracted solution were determined using a flow-injection analyzer (Auto Analyzer 3, Bran + Luebbe, Hamburg, Germany). The net nitrogen mineralization rate and net nitrification rate of the soils at AM2 and SF3 were determined according to the 15 N dilution method [Sørensen and Jensen, 1991;Wessel and Tietema, 1992;Stark and Hart, 1996]. We added 5 mg N of ammonium sulfate to 5 g of fresh soil.…”

Section: Soil Sampling and Analysismentioning

confidence: 99%

Potential N₂O emissions from leguminous tree plantation soils in the humid tropics

Arai

Ishizuka

Ohta

et al. 2008

Global Biogeochemical Cycles

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[1] We compared nitrous oxide (N 2 O) emissions over 1 year from soils of plantations growing acacia, which is a leguminous plant capable of symbiotic nitrogen fixation in root nodules, and secondary forests in Sumatra, Indonesia. N 2 O emissions from acacia plantation soils fluctuated seasonally, from high in the wetter season to low in the drier season, whereas N 2 O emissions from secondary forest soils were low throughout the year. Water-filled-pore-space data showed that denitrification contributed substantially to N 2 O emissions from soils at acacia sites. The average annual N 2 O flux in acacia plantations was 2.56 kg N ha À1 a À1 , which was eight times higher than that from secondary forest soils (0.33 kg N ha À1 a À1 ). In secondary forests, NH 4 + was the dominant form of inorganic nitrogen. However, in acacia plantations, the NH 4 + : NO 3 À ratio was relatively lower than that in secondary forests. These results suggest that secondary forests were nitrogen limited, but acacia plantations were less nitrogen limited. Leguminous tree plantations may increase nitrogen cycling, resulting in greater N 2 O emissions from the soil. However, on a global warming potential basis, N 2 O emissions from acacia plantation soils accounted for less than 10% of the carbon uptake by plants. Nevertheless, because of the spread of leguminous tree plantations in Asia, the importance of N 2 O emissions from leguminous tree stands will increase in the coming decades.

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“…Disks were dried overnight in a dessicator over concentrated sulfuric acid, wrapped in tin capsules, and analyzed for TN and 15 N enrichment using an elemental analyzer coupled to an isotope ratio mass spectrometer at the University of California at Davis. Rates of mineralization were determined using a model described by Wessel & Tietema (1992), which takes into account both changes in enrichment of the 15 N-labelled pool and the total concentration of that pool ( 15 N + 14 N); the model is similar to that derived by Blackburn (1979). Assumptions of the model are as follows: (1) 14 N and 15 N behave (bio-)chemically alike; (2) the pools in which 15 N is measured are homogeneous with respect to consumption and extraction; (3) 15 N abundance of organic N is at natural abundance; and (4) gross transformation rates remain constant during the incubation period.…”

Section: Methodsmentioning

confidence: 99%

Microbial mediation of 'reactive' nitrogen transformations in a temperate lagoon

Anderson¹,

McGlathery²,

Tyler³

2003

Mar. Ecol. Prog. Ser.

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Calculating gross N transformation rates of 15N pool dilution experiments with acid forest litter: Analytical and numerical approaches

Cited by 86 publications

References 17 publications

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

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

Potential N₂O emissions from leguminous tree plantation soils in the humid tropics

Microbial mediation of 'reactive' nitrogen transformations in a temperate lagoon

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Calculating gross N transformation rates of 15N pool dilution experiments with acid forest litter: Analytical and numerical approaches

Cited by 86 publications

References 17 publications

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

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

Potential N2O emissions from leguminous tree plantation soils in the humid tropics

Microbial mediation of 'reactive' nitrogen transformations in a temperate lagoon

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Product

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Potential N₂O emissions from leguminous tree plantation soils in the humid tropics