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Mycorrhization, root tip vitality and biomass of Fagus sylvatica, Picea abies and Pseudotsuga menziesii in monospecific and mixed combinations under water reduction and nitrogen addition
Ist Teil von
Trees (Berlin, West), 2024-06, Vol.38 (3), p.695-708
Ort / Verlag
Berlin/Heidelberg: Springer Berlin Heidelberg
Erscheinungsjahr
2024
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Key message
In mixed combinations, the negative impact of water reduction and N addition is mitigated for
F. sylvatica
, but not for conifers.
Insight into the responses of trees in mixed and monospecific cultivation to water scarcity and nitrogen (N) excess is necessary to recommend suitable tree mixtures for future European forests. Our aim was to investigate the impact of water reduction, N addition or water reduction + N addition in comparison with control (well-watered, no excess N) on mycorrhizal roots and biomass of three temperate forest species (
Fagus sylvatica
Fs,
Picea abies
Pa, and
Pseudotsuga menziesii
Pm) grown in monospecific (FsFs, PaPa, PmPm) and mixed combinations (PaFs, PmFs). We predicted the probability of the responses with a Bayesian approach. Mycorrhizal colonization declined marginally for
P. menziesii
in PmFs under water reduction. Under water reduction and N addition combined, we found a decline in root tip vitality of
F. sylvatica
in PaFs and of
P. abies
in PaPa.
F. sylvatica
shoot biomass declined under water reduction + N addition in the monospecific combination.
P. abies
and
P. menziesii
had lower root biomass in mixture with
F. sylvatica
under water reduction + N addition and under water reduction as single factor, respectively. With water reduction and N addition,
P. menziesii
performed better than
P. abies
in terms of biomass production.
F. sylvatica
had a growth advantage in mixture with conifers instead of conspecifics. These findings suggest that young trees show rapid and interspecific responses to species mixing and water + N availability. The selection of suitable tree species should, therefore, consider their interactive responses to changing abiotic factors.