Indices of interspecific plant competition for &lt;i&gt;Pinus radiata&lt;/i&gt; in the central north island of New Zealand

Richardson, B.; Kimberley, Mark O.; Ray, John W.; Coker, Graham

doi:10.1139/cjfr-29-7-898

Cited by 6 publications

(4 citation statements)

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“…The set of indices listed in Table 2 was selected based on their successful performance in previous studies examining competitive interactions in forest stands (e.g. Biging & Dobbertin 1992; Richardson et al . 1999) and to represent a range of complexity (e.g.…”

Section: Methodsmentioning

confidence: 99%

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The relative dominance hypothesis explains interaction dynamics in mixed species Alnus rubra/Pseudotsuga menziesii stands

Anthony

Klaus

2004

Journal of Ecology

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1 We used repeated measurements of tree growth and population-level and neighbourhood conditions from three mixed Alnus rubra/Pseudotsuga menziesii forests in the Pacific Northwest, USA to investigate why previous results regarding the importance of neighbourhood competition as a determinant of plant growth were inconsistent. 2 We propose that relative dominance of a particular species determines the importance of neighbourhood interactions, and tested whether growth performance of both species at various stand ages agrees with this relative dominance hypothesis. 3 Neighbourhood and relative dominance interaction indices were modified to accommodate two-species mixtures and were incorporated into a growth model predicting relative diameter growth rates. The corrected Akaike Information Criterion ( AIC c ) was used to identify the optimum interaction measures and model forms for each species and measurement period. 4 Interaction indices reflecting the size of a tree relative to the population were the best predictors of growth of the dominant (i.e. taller) species and neighbourhood interaction indices of the subordinate species. 5 Performance of interaction measures as predictors of relative growth rates in our study varied in agreement with the relative dominance hypothesis for both species and on all sites. Results from other studies suggest that the hypothesis may explain growth performances on a species and individual plant level and for a variety of life forms. 6 These findings suggest that the spatial scale of plant interactions is influenced by the size structure of plant populations. The relative dominance hypothesis offers a framework to provide insight into the mechanism of competition, based on the relative performance of competition indices.

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Section: Methodsmentioning

confidence: 99%

“…It is important to note that the choice of growth models using these interaction indices is determined by the study conditions. For example, Richardson et al . (1999) used an exponential growth model as their data were limited to very young seedlings, which have been shown to exhibit exponential growth.…”

Section: Methodsmentioning

confidence: 99%

The relative dominance hypothesis explains interaction dynamics in mixed species Alnus rubra/Pseudotsuga menziesii stands

Anthony

Klaus

2004

Journal of Ecology

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“…Competition can have an immediate effect on diameter but a delayed effect on height growth (Richardson et al 1999). Similarly, other factors such as growing space and mixture were nonsignificant over one year but substantial over four years.…”

Section: Discussionmentioning

confidence: 89%

Effect of density on Mediterranean pine seedlings using the Nelder wheel design: analysis of survival and early growth

Ruano

Pando

Bravo

2022

Forestry: An International Journal of Forest Research

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There is growing interest in mixed-species forests but also a lack of studies that analyse them at the regeneration phases or any stage other than mature stands. Information is particularly scarce about relatively unproductive species such as Pinus pinaster and Pinus halepensis in Mediterranean ecosystems. The objective of this study was to investigate inter- and intra-specific interactions of both species at different tree densities during the first years of establishment. Five Nelder wheel plots were planted to test densities ranging from 1000 to 80 000 seedlings/ha and simulate establishment sub-processes at high densities. Further, P. pinaster and P. halepensis were mixed along the spokes, to obtain three mixture levels in which 100, 80 or 60 per cent of the seedlings were of the same species. Cox proportional-hazards models and binomial logistic regressions were fitted to analyse seedling survival. Early growth (basal diameter and height at one and four years after plantation) was analysed by fitting linear mixed-effects models. In this regard, P. halepensis showed higher survival rates and basal diameter increments but more time is needed to know how P. pinaster responds to density and mixture. Both competitive and facilitating seedling interactions were observed at higher densities, which fostered seedling survival but decreased early growth.

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“…Height is often considered somewhat insensitive to competition relative to radial growth (McDonald and Fiddler, 1989;Wagner and Radosevich, 1998;Richardson et al, 1999). Ideally we would have compared the patterns of diameter and height growth for the various relative crown positions before Ceanothus was removed.…”

Section: Positive and Negative Effects Of Ceanothus On Conifer Growthmentioning

confidence: 99%

Conifer–Ceanothus interactions influence tree growth before and after shrub removal in a forest plantation in the western Cascade Mountains, USA

Erickson

Harrington

2006

Forest Ecology and Management

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Indices of interspecific plant competition for <i>Pinus radiata</i> in the central north island of New Zealand

Cited by 6 publications

References 0 publications

The relative dominance hypothesis explains interaction dynamics in mixed species Alnus rubra/Pseudotsuga menziesii stands

The relative dominance hypothesis explains interaction dynamics in mixed species Alnus rubra/Pseudotsuga menziesii stands

Effect of density on Mediterranean pine seedlings using the Nelder wheel design: analysis of survival and early growth

Conifer–Ceanothus interactions influence tree growth before and after shrub removal in a forest plantation in the western Cascade Mountains, USA

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