Alternative strategies for nutrient cycling in acidic and calcareous forests in the Luxembourg cuesta landscape

A.M. Kooijman, K. Kalbitz, A. Smit

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

In the forests of the Luxembourg cuesta landscape, nutrient cycling is affected by parent material, but in a different way than usually assumed. We challenge the 'conventional wisdom' that net N-mineralization is higher in calcareous than in acidic soils, due to higher biological activity and gross N-mineralization. In four separate laboratory incubation experiments, net N-mineralization was higher in acidic than in calcareous soil. Experiments with different tree species showed that soil type was even more important than litter quality. In acidic forests, high net N-mineralization may be due to dense organic layers, but also to differences in soil communities, which are dominated by fungi at low pH versus bacteria at high pH. Fungi have lower N-demand than bacteria, and may thus mitigate low activity and gross N-release. Model studies suggested that microbial immobilization was below 20% in acidic soil, and above 80% in calcareous soil, in both organic layer and mineral topsoil. Differences between fungi and bacteria were supported by selective inhibition. Microbial immobilization significantly decreased with the bactericide streptomycin, while respiration increased with the fungicide cycloheximide. This further supports that bacteria and fungi, and with them calcareous and acidic soils, show different strategies for N-nutrition. For P-nutrition, differences between calcareous and acidic soils are also important, as net P-mineralization mainly occurred in the organic layer, due to chemical sorption in the mineral soil. As a result, in the Luxembourg cuesta landscape, availability of both N and P may be higher in acidic than calcareous forests.
Original languageEnglish
Title of host publicationThe Luxembourg Gutland Landscape
PublisherSpringer International Publishing Switzerland
Pages131-151
ISBN (Electronic)9783319655437
ISBN (Print)9783319655413
DOIs
Publication statusPublished - 24 Oct 2017

Fingerprint

Luxembourg
calcareous soils
nutrient cycling
acid soils
biogeochemical cycles
mineralization
Soil
Food
fungi
fungus
bacteria
bacterium
soil
calcareous soil
Fungi
immobilization
Bacteria
nutrition
cycloheximide
Immobilization

Cite this

Kooijman, A. M., Kalbitz, K., & Smit, A. (2017). Alternative strategies for nutrient cycling in acidic and calcareous forests in the Luxembourg cuesta landscape. In The Luxembourg Gutland Landscape (pp. 131-151). Springer International Publishing Switzerland. https://doi.org/10.1007/978-3-319-65543-7_7
Kooijman, A.M. ; Kalbitz, K. ; Smit, A. / Alternative strategies for nutrient cycling in acidic and calcareous forests in the Luxembourg cuesta landscape. The Luxembourg Gutland Landscape. Springer International Publishing Switzerland, 2017. pp. 131-151
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Kooijman, AM, Kalbitz, K & Smit, A 2017, Alternative strategies for nutrient cycling in acidic and calcareous forests in the Luxembourg cuesta landscape. in The Luxembourg Gutland Landscape. Springer International Publishing Switzerland, pp. 131-151. https://doi.org/10.1007/978-3-319-65543-7_7

Alternative strategies for nutrient cycling in acidic and calcareous forests in the Luxembourg cuesta landscape. / Kooijman, A.M.; Kalbitz, K.; Smit, A.

The Luxembourg Gutland Landscape. Springer International Publishing Switzerland, 2017. p. 131-151.

Research output: Chapter in Book/Report/Conference proceedingChapter

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AB - In the forests of the Luxembourg cuesta landscape, nutrient cycling is affected by parent material, but in a different way than usually assumed. We challenge the 'conventional wisdom' that net N-mineralization is higher in calcareous than in acidic soils, due to higher biological activity and gross N-mineralization. In four separate laboratory incubation experiments, net N-mineralization was higher in acidic than in calcareous soil. Experiments with different tree species showed that soil type was even more important than litter quality. In acidic forests, high net N-mineralization may be due to dense organic layers, but also to differences in soil communities, which are dominated by fungi at low pH versus bacteria at high pH. Fungi have lower N-demand than bacteria, and may thus mitigate low activity and gross N-release. Model studies suggested that microbial immobilization was below 20% in acidic soil, and above 80% in calcareous soil, in both organic layer and mineral topsoil. Differences between fungi and bacteria were supported by selective inhibition. Microbial immobilization significantly decreased with the bactericide streptomycin, while respiration increased with the fungicide cycloheximide. This further supports that bacteria and fungi, and with them calcareous and acidic soils, show different strategies for N-nutrition. For P-nutrition, differences between calcareous and acidic soils are also important, as net P-mineralization mainly occurred in the organic layer, due to chemical sorption in the mineral soil. As a result, in the Luxembourg cuesta landscape, availability of both N and P may be higher in acidic than calcareous forests.

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M3 - Chapter

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BT - The Luxembourg Gutland Landscape

PB - Springer International Publishing Switzerland

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Kooijman AM, Kalbitz K, Smit A. Alternative strategies for nutrient cycling in acidic and calcareous forests in the Luxembourg cuesta landscape. In The Luxembourg Gutland Landscape. Springer International Publishing Switzerland. 2017. p. 131-151 https://doi.org/10.1007/978-3-319-65543-7_7