Variation in canopy structure, leaf area, light interception and light use efficiency among Eucalyptus clones
Autor(a) principal: | |
---|---|
Data de Publicação: | 2020 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.foreco.2020.118038 http://hdl.handle.net/11449/198567 |
Resumo: | Differences in growth rates between Eucalyptus clones depend on differences in the acquisition of resources, and the efficiency of using resources to produce carbohydrates and grow wood. We examined differences in canopy structure, light interception, and light use efficiency for the 18 TECHS clones in a common garden experiment in Brazil. The degree of clumping within canopies varied substantially among clones, leading to large differences in both leaf area and light interception per unit of leaf area. Two methods of determining plot-level leaf area index (LP-80 and LAI-2000) were moderately well correlated (R2 = 0.4), but both methods underestimated actual leaf area index (determined by destructive sampling) by about one-third. Completely overcast sky conditions increased accuracy of leaf area estimates, reducing variation among measurements within plots and lowering the number of samples needed to obtain a given level of precision. Genotypes with high leaf area clumping also had higher leaf angle inclinations than genotypes with lower clumping. The apparent light interception coefficient (k) averaged 0.56 for the LP-80, and 0.47 for the LAI-2000. The range of k estimates differed by up to 2-fold among clones, underscoring the limited generality of light extinction coefficients. Light interception ranged from about 70 to 95% of incoming light, and leaf area index accounted for only 30% of the pattern in light interception among clones. Differences in stemwood production were influenced more strongly by clonal differences in efficiency of light use (stemwood production per unit of light intercepted) than by differences in leaf area or light interception. The efficiency of producing wood per unit of light intercepted spanned a two-fold range, with higher efficiencies for more productive clones. We suggest that production ecology studies focus more on measurements of light interception than on leaf area, avoiding issues about difficult-to-measure features of crown and canopy structures. The additional step of characterizing light use efficiency would also be very important. |
id |
UNSP_5f6e70f52bf5f0023a78438460cf9858 |
---|---|
oai_identifier_str |
oai:repositorio.unesp.br:11449/198567 |
network_acronym_str |
UNSP |
network_name_str |
Repositório Institucional da UNESP |
repository_id_str |
2946 |
spelling |
Variation in canopy structure, leaf area, light interception and light use efficiency among Eucalyptus clonesLAI-2000Light extinction coefficientLP-80 CeptometerPlantation silvicultureProduction ecologyTECHS ProjectDifferences in growth rates between Eucalyptus clones depend on differences in the acquisition of resources, and the efficiency of using resources to produce carbohydrates and grow wood. We examined differences in canopy structure, light interception, and light use efficiency for the 18 TECHS clones in a common garden experiment in Brazil. The degree of clumping within canopies varied substantially among clones, leading to large differences in both leaf area and light interception per unit of leaf area. Two methods of determining plot-level leaf area index (LP-80 and LAI-2000) were moderately well correlated (R2 = 0.4), but both methods underestimated actual leaf area index (determined by destructive sampling) by about one-third. Completely overcast sky conditions increased accuracy of leaf area estimates, reducing variation among measurements within plots and lowering the number of samples needed to obtain a given level of precision. Genotypes with high leaf area clumping also had higher leaf angle inclinations than genotypes with lower clumping. The apparent light interception coefficient (k) averaged 0.56 for the LP-80, and 0.47 for the LAI-2000. The range of k estimates differed by up to 2-fold among clones, underscoring the limited generality of light extinction coefficients. Light interception ranged from about 70 to 95% of incoming light, and leaf area index accounted for only 30% of the pattern in light interception among clones. Differences in stemwood production were influenced more strongly by clonal differences in efficiency of light use (stemwood production per unit of light intercepted) than by differences in leaf area or light interception. The efficiency of producing wood per unit of light intercepted spanned a two-fold range, with higher efficiencies for more productive clones. We suggest that production ecology studies focus more on measurements of light interception than on leaf area, avoiding issues about difficult-to-measure features of crown and canopy structures. The additional step of characterizing light use efficiency would also be very important.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Universidade de São PauloDepartment of Forest Sciences University of São PauloGeplant Forest Technology Llc.School of Forestry Northern Arizona UniversityUniversidade Federal de LavrasDepartment of Forest Science São Paulo State University - UNESPDepartment of Forest Science São Paulo State University - UNESPUniversidade de São Paulo (USP)Geplant Forest Technology Llc.Northern Arizona UniversityUniversidade Federal de Lavras (UFLA)Universidade Estadual Paulista (Unesp)de Mattos, Eduardo M.Binkley, DanCampoe, Otavio C.Alvares, Clayton A. [UNESP]Stape, Jose L. [UNESP]2020-12-12T01:16:21Z2020-12-12T01:16:21Z2020-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.foreco.2020.118038Forest Ecology and Management, v. 463.0378-1127http://hdl.handle.net/11449/19856710.1016/j.foreco.2020.1180382-s2.0-85080032496Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengForest Ecology and Managementinfo:eu-repo/semantics/openAccess2021-10-22T16:54:16Zoai:repositorio.unesp.br:11449/198567Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T18:48:27.778699Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Variation in canopy structure, leaf area, light interception and light use efficiency among Eucalyptus clones |
title |
Variation in canopy structure, leaf area, light interception and light use efficiency among Eucalyptus clones |
spellingShingle |
Variation in canopy structure, leaf area, light interception and light use efficiency among Eucalyptus clones de Mattos, Eduardo M. LAI-2000 Light extinction coefficient LP-80 Ceptometer Plantation silviculture Production ecology TECHS Project |
title_short |
Variation in canopy structure, leaf area, light interception and light use efficiency among Eucalyptus clones |
title_full |
Variation in canopy structure, leaf area, light interception and light use efficiency among Eucalyptus clones |
title_fullStr |
Variation in canopy structure, leaf area, light interception and light use efficiency among Eucalyptus clones |
title_full_unstemmed |
Variation in canopy structure, leaf area, light interception and light use efficiency among Eucalyptus clones |
title_sort |
Variation in canopy structure, leaf area, light interception and light use efficiency among Eucalyptus clones |
author |
de Mattos, Eduardo M. |
author_facet |
de Mattos, Eduardo M. Binkley, Dan Campoe, Otavio C. Alvares, Clayton A. [UNESP] Stape, Jose L. [UNESP] |
author_role |
author |
author2 |
Binkley, Dan Campoe, Otavio C. Alvares, Clayton A. [UNESP] Stape, Jose L. [UNESP] |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Geplant Forest Technology Llc. Northern Arizona University Universidade Federal de Lavras (UFLA) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
de Mattos, Eduardo M. Binkley, Dan Campoe, Otavio C. Alvares, Clayton A. [UNESP] Stape, Jose L. [UNESP] |
dc.subject.por.fl_str_mv |
LAI-2000 Light extinction coefficient LP-80 Ceptometer Plantation silviculture Production ecology TECHS Project |
topic |
LAI-2000 Light extinction coefficient LP-80 Ceptometer Plantation silviculture Production ecology TECHS Project |
description |
Differences in growth rates between Eucalyptus clones depend on differences in the acquisition of resources, and the efficiency of using resources to produce carbohydrates and grow wood. We examined differences in canopy structure, light interception, and light use efficiency for the 18 TECHS clones in a common garden experiment in Brazil. The degree of clumping within canopies varied substantially among clones, leading to large differences in both leaf area and light interception per unit of leaf area. Two methods of determining plot-level leaf area index (LP-80 and LAI-2000) were moderately well correlated (R2 = 0.4), but both methods underestimated actual leaf area index (determined by destructive sampling) by about one-third. Completely overcast sky conditions increased accuracy of leaf area estimates, reducing variation among measurements within plots and lowering the number of samples needed to obtain a given level of precision. Genotypes with high leaf area clumping also had higher leaf angle inclinations than genotypes with lower clumping. The apparent light interception coefficient (k) averaged 0.56 for the LP-80, and 0.47 for the LAI-2000. The range of k estimates differed by up to 2-fold among clones, underscoring the limited generality of light extinction coefficients. Light interception ranged from about 70 to 95% of incoming light, and leaf area index accounted for only 30% of the pattern in light interception among clones. Differences in stemwood production were influenced more strongly by clonal differences in efficiency of light use (stemwood production per unit of light intercepted) than by differences in leaf area or light interception. The efficiency of producing wood per unit of light intercepted spanned a two-fold range, with higher efficiencies for more productive clones. We suggest that production ecology studies focus more on measurements of light interception than on leaf area, avoiding issues about difficult-to-measure features of crown and canopy structures. The additional step of characterizing light use efficiency would also be very important. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-12T01:16:21Z 2020-12-12T01:16:21Z 2020-05-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.foreco.2020.118038 Forest Ecology and Management, v. 463. 0378-1127 http://hdl.handle.net/11449/198567 10.1016/j.foreco.2020.118038 2-s2.0-85080032496 |
url |
http://dx.doi.org/10.1016/j.foreco.2020.118038 http://hdl.handle.net/11449/198567 |
identifier_str_mv |
Forest Ecology and Management, v. 463. 0378-1127 10.1016/j.foreco.2020.118038 2-s2.0-85080032496 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Forest Ecology and Management |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128982448603136 |