Differential modulation of crown allometry and stem growth at gap edges in five European tree species by drought conditions

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外文摘要：Background:In Central Europe,forests are increasingly affected by various disturbances,resulting in an increasing gap formation in the canopy.In order to support goal-oriented management,more knowledge is required about the acclimation of the crown and its effects on the basal area growth of trees at the edge of a gap.Methods:This work compared trees'growth and crown structure at the edge of a transient gap,with a gap size of more than 80 m2,with trees in the stand that were at least 30 m away from the gap.A total of 249 European beeches(Fagus sylvatica L.),Norway spruces(Picea abies L.Karst),Scots pines(Pinus sylvestris L.),oaks(Quercus spp.;Quercus petraea(Matt.)Liebl.,Quercus robur L.),and silver firs(Abies alba Mill.)were examined on long-term experimental plots in southern Germany.Various crown measures were developed and calculated using high-resolution terrestrial laser scanning(TLiDAR)to capture the three-dimensional crown structures.Growth re-sponses to edge conditions were measured based on tree rings.Using linear mixed models,we predict the basal area increment of edge trees relative to trees in the stand under wet and dry soil moisture conditions after the gap formation.Results:We identified ⅰ)species-specific acclimation of the crown of edge trees after the gap formation,ⅱ)under wet soil moisture conditions a growth increase of 25％-45％for beech,pine,and oak edge trees and growth losses of 5％-60％ for spruce and fir and ⅲ)coniferous tree species benefited from the edge position regarding their basal area increment under dry soil moisture conditions and deciduous tree species grew regardless of the soil moisture conditions at the edge of a gap.Conclusion:Gaps have a species-specific effect on the habitus and growth of edge trees and can have both positive and negative impacts on silviculture.

外文关键词：

Canopy gapsDisturbanceGrowthTLiDARDrought stressCrown structureAcclimation

作者：

Luke Bohnhorst、Peter Biber、Torben Hilmers、Enno Uhl、Hans Pretzsch

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作者单位：

Chair of Forest Growth and Yield Science,TUM School of Life Sciences,Technical University of Munich,Hans-Carl-von-Carlowitz-Platz 2,85354,Freising,Germany

Bavarian State Institute of Forestry,Hans-Carl-von-Carlowitz-Platz 1,85354,Freising,Germany

基金：

Bavarian Ministry of Nutrition,Agriculture and Forestry through the projects"Acclimation of Forest Trees""Maintenance and Monitoring of long term experiments""Maintenance and Monitoring of long term experiments"

项目编号：

kliffw006W007Gz:7831-1/874

出版年：

2024

DOI：

10.1016/j.fecs.2024.100219

森林生态系统(英文版)

北京林业大学

森林生态系统(英文版)

CSTPCD

影响因子：0.09

ISSN：2095-6355

年,卷(期)：2024.11(5)