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Soil, land care and environmental research
RESEARCH ARTICLE

Do admixed conifers change soil nutrient conditions of European beech stands?

Estela Covre Foltran https://orcid.org/0000-0001-5752-9675 A B * , Christian Ammer C and Norbert Lamersdorf A
+ Author Affiliations
- Author Affiliations

A Soil Science of Temperate Ecosystems – Georg-August University of Göttingen, Göttingen, Germany.

B INRAe – ISPA Interaction Soil, Plant and Atmosphere, France.

C Silviculture and Forest Ecology of the Temperate Zones, Georg-August University of Göttingen, Göttingen, Germany.

* Correspondence to: estelacfoltran@gmail.com

Handling Editor: Frank Ashwood

Soil Research 61(7) 647-662 https://doi.org/10.1071/SR22218
Submitted: 13 October 2022  Accepted: 6 May 2023   Published: 23 June 2023

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context: Establishing mixed forest stands is an option for improving soil nutrient conditions and for increasing the resilience of forest ecosystems.

Aims: Identify the effects on soil chemistry of spruce and Douglas fir admixed in European beech forest.

Methods: We analysed pure and mixed species stands in Germany. The pure stands were mature European beech (Fagus sylvatica), Douglas fir (Pseudotsuga menziesii), and Norway spruce (Picea abies). The mixtures were composed of beech with either Douglas fir or spruce. The stands were located in two regions with different soil conditions.

Results: Our results indicated that pure spruce stands, independent of site condition, had the lowest base saturation while beech showed the highest values. The impact of Douglas fir differed between site conditions. On sandy soils, there was higher pH and base saturation under Douglas fir than under spruce. On loamy soils, however, the pH under Douglas fir and beech was lower than under spruce. The cation stocks (Ca and Mg) on sandy soils were lower under spruce and spruce/beech stands than under Douglas fir and beech. In contrast, under loamy soil, exchangeable Ca and Mg stocks were less under beech than under spruce stands. Soil exchangeable K under mixed stands was among the highest compared to pure stands, independent of site condition.

Conclusions: Mixed species stands reduce soil base cation depletion compared to conifer stands.

Implications: Admixture of Douglas fir to European beech seems to be a more reasonable option for forest management than an admixture of spruce, since it does not negatively affect soil chemistry.

Keywords: CEC, European forest, Fagus sylvatica, mixed forests, nutrient stocks, Picea abies, Pseudotsuga menziesii, soil pH.


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