Show simple item record  

dc.contributor.authorLusk, Christopher H.
dc.contributor.authorJorgensen, Murray A.
dc.date.accessioned2013-11-07T03:05:58Z
dc.date.available2013-11-07T03:05:58Z
dc.date.copyright2013-06-25
dc.date.issued2013
dc.identifier.citationLusk, C. H., Jorgensen, M. A. (2013). The whole-plant compensation point as a measure of juvenile tree light requirements. Functional Ecology, published online 25 June, 2013.en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/8151
dc.description.abstract1. Although ‘shade tolerance’ has featured prominently in the vocabulary of foresters and ecologists for a century, we have yet to agree on a standardized method for quantifying this elusive property. The ‘whole-plant compensation point’, interpolated from stem growth measurements across a wide range of light environments, has been proposed as a simple, robust measure of species shade tolerance. Others have argued that shade tolerance is primarily a function of differential ability to survive periods of slow growth (‘suppression’), implying that measurements of survival are vital. 2. We measured growth of juveniles (500–1000 mm tall) of five evergreen trees over 12 months in a cool-temperate rain forest in New Zealand, to determine whether whole-plant compensation points predicted species differences in occupancy of understorey light environments, which were quantified using hemispherical photography. 3. The five species encompassed 3•5-fold variation in whole-plant compensation points. Compensation points of most species fell within the first quartile of the distribution of light environments occupied by juveniles; they were also correlated with low-light mortality rates of juveniles, estimated from permanent plot data archived in the National Vegetation Survey Databank. Compensation points were also significantly positively correlated with height growth rates in high light, confirming the presence of the growth vs. shade tolerance trade-off detected in many other forest tree assemblages. 4. Results show that, in temperate evergreen forests, the whole-plant compensation point distinguishes reliably between species of differing shade tolerance. Excepting situations involving parameterization of demographic models, shade tolerance can therefore be assessed without survival measurements. However, estimating whole-plant compensation points may prove more difficult in deciduous forests, where seasonal variation in understorey light transmission poses additional challenges.en_NZ
dc.language.isoenen_NZ
dc.publisherWileyen_NZ
dc.relation.ispartofFunctional Ecology
dc.relation.urihttp://onlinelibrary.wiley.com/doi/10.1111/1365-2435.12129/abstracten_NZ
dc.subjectforest dynamicsen_NZ
dc.subjectgrowthen_NZ
dc.subjectNothofagusen_NZ
dc.subjectrelative growth rateen_NZ
dc.subjectshade toleranceen_NZ
dc.subjectsuccessionen_NZ
dc.subjectsurvivalen_NZ
dc.subjecttemperate rain foresten_NZ
dc.titleThe whole-plant compensation point as a measure of juvenile tree light requirementsen_NZ
dc.typeJournal Articleen_NZ
dc.identifier.doi10.1111/1365-2435.12129en_NZ
dc.relation.isPartOfFunctional Ecologyen_NZ
pubs.begin-page1en_NZ
pubs.elements-id38714
pubs.end-page9en_NZ
pubs.issue6en_NZ
pubs.volumeonlineen_NZ


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record