Tree light capture and spatial variability of understory light increase with species mixing and tree size heterogeneity

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dc.contributor.authorLigot, Gauthier
dc.contributor.authorAméztegui González, Aitor
dc.contributor.authorCourbaud, Benoît
dc.contributor.authorColl Mir, Lluís
dc.contributor.authorKneeshaw, Daniel
dc.date.accessioned2019-06-20T14:43:04Z
dc.date.available2019-06-20T14:43:04Z
dc.date.issued2016
dc.date.updated2019-06-20T14:43:05Z
dc.description.abstractMixed and multi-layered forest ecosystems are sometimes more productive than monospecific and single-layered ones. It has been suggested that trees of different species and sizes occupy complementary positions in space, which would act as a mechanism to increase canopy light interception and wood production. However, greater canopy light interception reduces the average amount and variability of transmitted radiation, offering fewer opportunities for all species to regenerate and to maintain forest heterogeneity in the long run. We investigated whether increasing overstory heterogeneity indeed results in greater canopy light interception and lower variability in transmittance. We modeled the three-dimensional structure of forest stands with three typical forest structures, 10 mixtures of four tree species, and three different basal areas. We used the forest light interception model SamsaraLight and performed three-way analyses of covariance to analyze the effects of the three varied components of forest heterogeneity. We found no evidence that increasing structural heterogeneity increases canopy light interception. However, the light interception by mixed canopies was greater than the weighted average of light interception by the corresponding pure canopies. Variability in transmittance increased in some cases with compositional heterogeneity and, to a lesser extent, with tree size inequalities. The advantage of heterogeneous forests is in opportunities for natural regeneration, as well as in opportunities to enhance canopy light interception.
dc.format.mimetypeapplication/pdf
dc.identifier.doihttps://doi.org/10.1139/cjfr-2016-0061
dc.identifier.idgrec026624
dc.identifier.issn0045-5067
dc.identifier.urihttp://hdl.handle.net/10459.1/66482
dc.language.isoeng
dc.publisherNRC Research Press
dc.relation.isformatofVersió postprint del document publicat a: https://doi.org/10.1139/cjfr-2016-0061
dc.relation.ispartofCanadian Journal Of Forest Research-Revue Canadienne de Recherche Forestiere, 2016, vol. 46, num. 7, p. 968-977
dc.rights(c) Ligot, G. et al., 2016
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.subjectUnderstory light
dc.subjectTree species diversity
dc.subjectRadiative transfer model
dc.subjectForest structure
dc.titleTree light capture and spatial variability of understory light increase with species mixing and tree size heterogeneity
dc.typeinfo:eu-repo/semantics/article
dc.type.versioninfo:eu-repo/semantics/acceptedVersion
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