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5 results for “tree radial growth”
Data from: Light availability predicts mortality probability of conifer saplings in Swiss mountain forests better than radial growth and tree size
<p>Radial and height growth rates are suitable indicators of impending tree mortality risk of adult trees, but their applicability to saplings remains unknown. We compared radial growth of living and dead saplings of different heights and quantified the effects of light availability, growth and tree size on mortality. We sampled an equal number of living and dead saplings of four coniferous tree species (<i>Pinus cembra</i>, <i>Larix decidua</i>, <i>Picea abies</i>, <i>Abies alba</i>) in nine forests along an elevational gradient of the Swiss Alps. Based on tree-ring widths reconstructed from stem disks at multiple tree heights, we calculated radial growth rates. We observed a divergent pattern in radial growth of living and dead saplings, with reduced growth of dead saplings starting several years prior to death. By matching living and dead saplings of similar ages, we tested whether mortality probabilities of saplings were influenced by light availability, recent growth rates and diameter. Mortality of coniferous saplings in mountain forests was mainly influenced by light availability, with changing effects along the elevational gradient. Recent radial growth rate and tree size were only weakly associated with sapling mortality. Our study establishes the importance of long-term predisposing factors for the mortality probability of conifer saplings in mountain forests, thus extending well-established findings from the adult stage to saplings, which represent a critical stage of forest dynamics.</p>
Number of growth days and not length of the growth period determines radial stem growth of temperate trees
<p>Radial stem growth dynamics at seasonal resolution are essential to understand how forests respond to climate change. We studied daily radial growth of 160 individuals of seven temperate tree species at 47 sites across Switzerland over eight years. Growth of all species peaked in the early part of the growth season and commenced shortly before the summer solstice, but with species-specific seasonal patterns. Day length set a window of opportunity for radial growth. Within this window, the probability of daily growth was constrained particularly by air and soil moisture, resulting in intermittent growth to occur only on 29 to 77 days (30 to 80 %) within the growth period. The number of days with growth largely determined annual growth, whereas the growth period length contributed less. We call for accounting these non-linear intra-annual and species-specific growth dynamics in tree and forest models to reduce uncertainties in predictions under climate change.</p>
Phylogenetic Effect on Tree Radial Growth Depends on Drought and Tree Sizes
<p>This dataset is the calculated Blomberg's K values from tree growth rates.</p>
Number of growth days and not length of the growth period determines radial stem growth of temperate trees
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Data from: Light availability predicts mortality probability of conifer saplings in Swiss mountain forests better than radial growth and tree size
Open the record for dataset details and reuse information.
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