Paradoxical differences in N-dynamics between Luxembourg soils: litter quality or parent material?

Kooijman, A.M.; Smit, A.

doi:10.1007/s10342-009-0303-5

Cited by 12 publications

(7 citation statements)

References 45 publications

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“…This remarkable variation in the effects of species, genera, and plant functional types on net N min rates probably arises, in part, because the effect of plant traits on net N min depends on environmental factors and stand properties. For example, rankings for net N min rates among tree species can depend on stand age (Pare´and Bergeron 1996), soil horizon (Thomas and Prescott 2000), and soil type (Ste-Marie et al 2007, Kooijman andSmit 2009). The relative effects of different plant traits on net N min rates also are likely to depend on these and other factors.…”

Section: Discussionmentioning

confidence: 99%

Do evergreen and deciduous trees have different effects on net N mineralization in soil?

Mueller

Hobbie

Oleksyn

et al. 2012

Ecology

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Evergreen and deciduous plants are widely expected to have different impacts on soil nitrogen (N) availability because of differences in leaf litter chemistry and ensuing effects on net N mineralization (N(min)). We evaluated this hypothesis by compiling published data on net N(min) rates beneath co-occurring stands of evergreen and deciduous trees. The compiled data included 35 sets of co-occurring stands in temperate and boreal forests. Evergreen and deciduous stands did not have consistently divergent effects on net N(min) rates; net N(min) beneath deciduous trees was higher when comparing natural stands (19 contrasts), but equivalent to evergreens in plantations (16 contrasts). We also compared net N(min) rates beneath pairs of co-occurring genera. Most pairs of genera did not differ consistently, i.e., tree species from one genus had higher net N(min) at some sites and lower net N(min) at other sites. Moreover, several common deciduous genera (Acer, Betula, Populus) and deciduous Quercus spp. did not typically have higher net N(min) rates than common evergreen genera (Pinus, Picea). There are several reasons why tree effects on net N(min) are poorly predicted by leaf habit and phylogeny. For example, the amount of N mineralized from decomposing leaves might be less than the amount of N mineralized from organic matter pools that are less affected by leaf litter traits, such as dead roots and soil organic matter. Also, effects of plant traits and plant groups on net N(min) probably depend on site-specific factors such as stand age and soil type.

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Section: Discussionmentioning

confidence: 99%

Do evergreen and deciduous trees have different effects on net N mineralization in soil?

Mueller

Hobbie

Oleksyn

et al. 2012

Ecology

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“…In the control treatment, the results further support the hypothesis that neutral soils have higher biological activity than acidic soils, but that net N-mineralization may nevertheless be lower due to higher microbial N-demand and immobilization. This could explain why net N-mineralization was lower in neutral than in acid soil in e.g., Zöttle (1960), Davy and Taylor (1974), Verhoeven et al (1990), Kooijman and Besse (2002), Kooijman et al (2008), Kooijman and Smit (2009) and Mettrop et al (2014).…”

Section: Different Roles Of Bacteria and Fungimentioning

confidence: 99%

“…Respiration was measured at the start and end of the incubation experiments, as preliminary experiments indicated that CO 2production during the experiment was more or less constant (Kooijman and Smit, 2009). Fresh or incubated material was placed in open glass jars during one night, with the equivalent of 5 g dry weight for organic and 10-15 g for mineral samples.…”

Section: Laboratory Incubation Experimentsmentioning

confidence: 99%

“…Efficiency of N-mineralization was calculated as net Nmineralization per unit C respired, which can be used as proxy for microbial immobilization, and the relative amount of N available to the vegetation (Kooijman et al, 2008;Kooijman and Smit, 2009). In this case, high N mineralization per unit respiration indicates low immobilization by micro-organisms, and a high efficiency of N-mineralization for the vegetation.…”

Section: Laboratory Incubation Experimentsmentioning

confidence: 99%

“…Yet, there are some problems with this scenario. More than a few studies report higher instead of lower net N-mineralization in acidic, fungal-dominated systems, compared to neutral, bacteriadominated soil (Zöttle, 1960;Davy and Taylor, 1974;Verhoeven et al, 1990;Kooijman and Besse, 2002;Kooijman et al, 2008;Kooijman and Smit, 2009;Mettrop et al, 2014). This may be explained by low immobilization in fungi, due to high C:N ratios and relatively slow life cycles (Hassink, 1994;Moore et al, 2005;Cleveland and Liptzin, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Differences in activity and N demand between bacteria and fungi in a microcosm incubation experiment with selective inhibition

Kooijman

Bloem

Dalen

et al. 2016

Applied Soil Ecology

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Bacteria and fungi are important micro-organisms in the soil, but may differ in their impact on net Nmineralization. The hypothesis was tested that fungi are characterized by low microbial activity, but also low immobilization, and bacteria by high activity and high immobilization. A one-month laboratory incubation experiment with selective inhibition of fungi (cycloheximide) or bacteria (streptomycin) was conducted with samples of organic layer and mineral topsoil (0-10 cm) from neutral, bacteria-dominated and acidic, fungi-dominated Luxembourg beech forests. In the control treatment, respiration was higher in neutral than in acidic soil, but net N-mineralization was lower, due to higher immobilization. In the antibiotic treatments, differences in nitrification suggest that selective inhibition indeed occurred; in all soils and horizons, nitrification was especially limited by bactericide. Besides as inhibitor of the target group, antibiotics may also serve as source of C and N for the non-target group. For both bactericide and fungicide, acidic soils showed higher net recovery of C and N from antibiotics than neutral soil, which suggests that uptake or sorption of antibiotics is higher in the latter. Clear differences between neutral and acidic soils arose when the main micro-organisms were stimulated. In bacteria-dominated neutral soil, application of fungicide led to increased microbial respiration. In fungi-dominated acidic soil, however, application of bactericide did not lead to higher respiration, but to increased net Nmineralization per unit respiration, which supports a lower immobilization. Differences between antibiotics were consistent for organic layer and mineral topsoil, with increase in activity with fungicide, and lower immobilization with bactericide. The results provide correlative and experimental evidence that reduced immobilization by fungi compensates for their lower rates of activity with respect to Navailability to the vegetation.2015 Elsevier B.V. All rights reserved.

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Alternative Strategies for Nutrient Cycling in Acidic and Calcareous Forests in the Luxembourg Cuesta Landscape

Kooijman

Kalbitz

Smit

2017

The Luxembourg Gutland Landscape

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Paradoxical differences in N-dynamics between Luxembourg soils: litter quality or parent material?

Cited by 12 publications

References 45 publications

Do evergreen and deciduous trees have different effects on net N mineralization in soil?

Do evergreen and deciduous trees have different effects on net N mineralization in soil?

Differences in activity and N demand between bacteria and fungi in a microcosm incubation experiment with selective inhibition

Alternative Strategies for Nutrient Cycling in Acidic and Calcareous Forests in the Luxembourg Cuesta Landscape

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