Claim · model-written summary
Inverse-squared distance gave a slightly better model fit than inverse distance.
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleTreatmentSettingValueQualifier
Verbatim
e0“The use of an inverse-squared distance to neighbouring plants in the competition index provided a slightly superior fit to the data compared to one that employed a simple inverse of distance.”
t0“radiata pine”
Title
Sharma, Rajesh Kumar University of Canterbury Research Repository (University of Canterbury) 2008. doi:10.26021/2473
Other claims from this paper (19)
- Observation Clones significantly differed in initial morphology, survival and stem slenderness.
- Association Sturdiness and initial height best predicted initial survival.
- Intervention effect Deployment did not affect overall productivity but significantly affected individual clone productivity.
- Observation Clone productivity contributions were similar in monoclonal plots but disproportionate in mixtures, where a minority supplied most productivity.
- Method / resource Competition index explained significant diameter-growth variability.
- Method / resource Genotype information further improved model fit.
- Observation Competition stayed uniform in monoclonal plots but increased for some mixture clones, increasing size variability.
- Recommendation Early and single-tree selections may miss genotypes that grow rapidly monoclonally; block selections may enhance monoclonal productivity.
- Observation Clones differed in modeled yield patterns and asymptotes and formed two distinct yield-model groups.
- Method / resource Models based on the first few years were biased indicators of future relative performance.
- Method / resource The 3-PG model could be calibrated to simulate clone productivity and potentially inform site-specific selection.
- Observation Clones significantly differed in foliage and stem biomass at age five.
- Mechanism Productivity differences mainly reflected biomass partitioning and specific leaf area differences.
- Observation At 1250 stems/ha clones significantly differed in stiffness, slenderness and branch traits.
- Association Deployment affected stem slenderness; slenderness correlated with and significantly influenced stiffness, but clone stiffness differences were not significant.
- Intervention effect Increasing stocking from 833 to 2500 stems/ha decreased branch diameter 56%.
- Intervention effect Increasing stocking from 833 to 2500 stems/ha increased branch angle 17%.
- Intervention effect Monoclonal trees had greater uniformity in size, slenderness and competition.
- Observation One clone's woolly aphid susceptibility suggested increased risk from large monoclonal deployment.