Data from: Crown asymmetry in high latitude forests: disentangling the directional effects of tree competition and solar radiation
Light foraging by trees is a fundamental process shaping forest communities. In heterogeneous light environments this behavior is expressed as plasticity of tree growth and the development of structural asymmetries. We studied the relative influence of neighborhood structure and directional solar ra...
Main Authors: | , , , , |
---|---|
Format: | Other/Unknown Material |
Language: | unknown |
Published: |
Zenodo
2015
|
Subjects: | |
Online Access: | https://doi.org/10.5061/dryad.6t6gp |
id |
ftzenodo:oai:zenodo.org:4975311 |
---|---|
record_format |
openpolar |
spelling |
ftzenodo:oai:zenodo.org:4975311 2024-09-15T18:06:01+00:00 Data from: Crown asymmetry in high latitude forests: disentangling the directional effects of tree competition and solar radiation Aakala, Tuomas Shimatani, Ichiro Abe, Toshihiro Kubota, Yasuhiro Kuuluvainen, Timo 2015-09-24 https://doi.org/10.5061/dryad.6t6gp unknown Zenodo https://doi.org/10.1111/oik.02858 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.6t6gp oai:zenodo.org:4975311 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode cylindrical distribution Salix caprea Betula pubescens Pinus sylvestris Picea abies crown asymmetry info:eu-repo/semantics/other 2015 ftzenodo https://doi.org/10.5061/dryad.6t6gp10.1111/oik.02858 2024-07-26T01:38:56Z Light foraging by trees is a fundamental process shaping forest communities. In heterogeneous light environments this behavior is expressed as plasticity of tree growth and the development of structural asymmetries. We studied the relative influence of neighborhood structure and directional solar radiation on horizontal asymmetry of tree crowns in late-successional high latitude (67–68°N) forests in northern Fennoscandia. We described crown asymmetries as crown vectors (i.e. horizontal vectors from stem center to crown center), which we obtained from canopy maps based on crown perimeter measurements in the field. To disentangle the influence of the two main determinants, inter-tree competition and directionality of above-canopy solar radiation at high latitudes, we applied circular statistical models, utilizing cylindrical distributions, to these data consisting of orientations and intensities of crown asymmetry. At the individual tree level, our model predicted crown asymmetry vectors from the current stand structure, and the predictions became better when the intensity of asymmetry (i.e. crown vector length) was higher. Competition was the main determinant of crown asymmetry for 2/3 of trees, and the model predictions improved when we incorporated the directionality of solar radiation. At the stand-level, these asymmetries had resulted in a small increment of the projected canopy area and an increased regularity of spatial structure. Our circular statistical modelling approach provided a quantitative evaluation of the relative importance of directionality of solar radiation and neighborhood stand structure, showing how both of these factors play a role in formation of crown asymmetries in high latitude forests. This approach further demonstrated the applicability of circular statistical modeling in ecological studies where the response variable has both orientation and intensity. Field measurement data The file contains field measurements of trees, including site (1 to 48), coordinates (x,y,z, in meters), ... Other/Unknown Material Fennoscandia Zenodo |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
unknown |
topic |
cylindrical distribution Salix caprea Betula pubescens Pinus sylvestris Picea abies crown asymmetry |
spellingShingle |
cylindrical distribution Salix caprea Betula pubescens Pinus sylvestris Picea abies crown asymmetry Aakala, Tuomas Shimatani, Ichiro Abe, Toshihiro Kubota, Yasuhiro Kuuluvainen, Timo Data from: Crown asymmetry in high latitude forests: disentangling the directional effects of tree competition and solar radiation |
topic_facet |
cylindrical distribution Salix caprea Betula pubescens Pinus sylvestris Picea abies crown asymmetry |
description |
Light foraging by trees is a fundamental process shaping forest communities. In heterogeneous light environments this behavior is expressed as plasticity of tree growth and the development of structural asymmetries. We studied the relative influence of neighborhood structure and directional solar radiation on horizontal asymmetry of tree crowns in late-successional high latitude (67–68°N) forests in northern Fennoscandia. We described crown asymmetries as crown vectors (i.e. horizontal vectors from stem center to crown center), which we obtained from canopy maps based on crown perimeter measurements in the field. To disentangle the influence of the two main determinants, inter-tree competition and directionality of above-canopy solar radiation at high latitudes, we applied circular statistical models, utilizing cylindrical distributions, to these data consisting of orientations and intensities of crown asymmetry. At the individual tree level, our model predicted crown asymmetry vectors from the current stand structure, and the predictions became better when the intensity of asymmetry (i.e. crown vector length) was higher. Competition was the main determinant of crown asymmetry for 2/3 of trees, and the model predictions improved when we incorporated the directionality of solar radiation. At the stand-level, these asymmetries had resulted in a small increment of the projected canopy area and an increased regularity of spatial structure. Our circular statistical modelling approach provided a quantitative evaluation of the relative importance of directionality of solar radiation and neighborhood stand structure, showing how both of these factors play a role in formation of crown asymmetries in high latitude forests. This approach further demonstrated the applicability of circular statistical modeling in ecological studies where the response variable has both orientation and intensity. Field measurement data The file contains field measurements of trees, including site (1 to 48), coordinates (x,y,z, in meters), ... |
format |
Other/Unknown Material |
author |
Aakala, Tuomas Shimatani, Ichiro Abe, Toshihiro Kubota, Yasuhiro Kuuluvainen, Timo |
author_facet |
Aakala, Tuomas Shimatani, Ichiro Abe, Toshihiro Kubota, Yasuhiro Kuuluvainen, Timo |
author_sort |
Aakala, Tuomas |
title |
Data from: Crown asymmetry in high latitude forests: disentangling the directional effects of tree competition and solar radiation |
title_short |
Data from: Crown asymmetry in high latitude forests: disentangling the directional effects of tree competition and solar radiation |
title_full |
Data from: Crown asymmetry in high latitude forests: disentangling the directional effects of tree competition and solar radiation |
title_fullStr |
Data from: Crown asymmetry in high latitude forests: disentangling the directional effects of tree competition and solar radiation |
title_full_unstemmed |
Data from: Crown asymmetry in high latitude forests: disentangling the directional effects of tree competition and solar radiation |
title_sort |
data from: crown asymmetry in high latitude forests: disentangling the directional effects of tree competition and solar radiation |
publisher |
Zenodo |
publishDate |
2015 |
url |
https://doi.org/10.5061/dryad.6t6gp |
genre |
Fennoscandia |
genre_facet |
Fennoscandia |
op_relation |
https://doi.org/10.1111/oik.02858 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.6t6gp oai:zenodo.org:4975311 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5061/dryad.6t6gp10.1111/oik.02858 |
_version_ |
1810443524043177984 |