Across a macro-ecological gradient forest competition is strongest at the most productive sites
We tested the hypothesis that the effect of forest basal area on tree growth interacts with macro-ecological gradients of primary productivity, using a large dataset of eucalypt tree growth collected across temperate and sub- tropical mesic Australia. To do this, we derived an index of inter-tree co...
| Main Authors: | , |
|---|---|
| Format: | Online |
| Language: | English |
| Published: |
Frontiers Media S.A.
2014
|
| Online Access: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4046579/ |
| id |
pubmed-4046579 |
|---|---|
| recordtype |
oai_dc |
| spelling |
pubmed-40465792014-06-12 Across a macro-ecological gradient forest competition is strongest at the most productive sites Prior, Lynda D. Bowman, David M. J. S. Plant Science We tested the hypothesis that the effect of forest basal area on tree growth interacts with macro-ecological gradients of primary productivity, using a large dataset of eucalypt tree growth collected across temperate and sub- tropical mesic Australia. To do this, we derived an index of inter-tree competition based on stand basal area (stand BA) relative to the climatically determined potential basal area. Using linear mixed effects modeling, we found that the main effects of climatic productivity, tree size, and competition explained 26.5% of the deviance in individual tree growth, but adding interactions to the model could explain a further 8.9%. The effect of competition on growth interacts with the gradient of climatic productivity, with negligible effect of competition in low productivity environments, but marked negative effects at the most productive sites. We also found a positive interaction between tree size and stand BA, which was most pronounced in the most productive sites. We interpret these patterns as reflecting intense competition for light amongst maturing trees on more productive sites, and below ground moisture limitation at low productivity sites, which results in open stands with little competition for light. These trends are consistent with the life history and stand development of eucalypt forests: in cool moist environments, light is the most limiting resource, resulting in size-asymmetric competition, while in hot, low rainfall environments are open forests with little competition for light but where the amount of tree regeneration is limited by water availability. Frontiers Media S.A. 2014-06-05 /pmc/articles/PMC4046579/ /pubmed/24926304 http://dx.doi.org/10.3389/fpls.2014.00260 Text en Copyright © 2014 Prior and Bowman. http://creativecommons.org/licenses/by/3.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
| repository_type |
Open Access Journal |
| institution_category |
Foreign Institution |
| institution |
US National Center for Biotechnology Information |
| building |
NCBI PubMed |
| collection |
Online Access |
| language |
English |
| format |
Online |
| author |
Prior, Lynda D. Bowman, David M. J. S. |
| spellingShingle |
Prior, Lynda D. Bowman, David M. J. S. Across a macro-ecological gradient forest competition is strongest at the most productive sites |
| author_facet |
Prior, Lynda D. Bowman, David M. J. S. |
| author_sort |
Prior, Lynda D. |
| title |
Across a macro-ecological gradient forest competition is strongest at the most productive sites |
| title_short |
Across a macro-ecological gradient forest competition is strongest at the most productive sites |
| title_full |
Across a macro-ecological gradient forest competition is strongest at the most productive sites |
| title_fullStr |
Across a macro-ecological gradient forest competition is strongest at the most productive sites |
| title_full_unstemmed |
Across a macro-ecological gradient forest competition is strongest at the most productive sites |
| title_sort |
across a macro-ecological gradient forest competition is strongest at the most productive sites |
| description |
We tested the hypothesis that the effect of forest basal area on tree growth interacts with macro-ecological gradients of primary productivity, using a large dataset of eucalypt tree growth collected across temperate and sub- tropical mesic Australia. To do this, we derived an index of inter-tree competition based on stand basal area (stand BA) relative to the climatically determined potential basal area. Using linear mixed effects modeling, we found that the main effects of climatic productivity, tree size, and competition explained 26.5% of the deviance in individual tree growth, but adding interactions to the model could explain a further 8.9%. The effect of competition on growth interacts with the gradient of climatic productivity, with negligible effect of competition in low productivity environments, but marked negative effects at the most productive sites. We also found a positive interaction between tree size and stand BA, which was most pronounced in the most productive sites. We interpret these patterns as reflecting intense competition for light amongst maturing trees on more productive sites, and below ground moisture limitation at low productivity sites, which results in open stands with little competition for light. These trends are consistent with the life history and stand development of eucalypt forests: in cool moist environments, light is the most limiting resource, resulting in size-asymmetric competition, while in hot, low rainfall environments are open forests with little competition for light but where the amount of tree regeneration is limited by water availability. |
| publisher |
Frontiers Media S.A. |
| publishDate |
2014 |
| url |
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4046579/ |
| _version_ |
1612097326602518528 |