Trunk and main-branch development in <i>Nothofagus pumilio</i> (Nothofagaceae): a retrospective analysis of tree growth
Bibliographic record
Abstract
The development of the trunk and main branches of approximately 26-year-old Nothofagus pumilio (Poepp. et Endl.) Krasser trees was studied. The length and number of leaves of annual shoots were recorded for 56 trees from a natural population. Morphological and macroanatomical features allowed the identification of shoot apex deaths and the axillary positions from which branches and relay shoots derived. The trees had a mean height of approximately 6 m and a mean basal diameter of approximately 8 cm. The length of trunk shoots increased from the first years to the intermediate years of tree growth and decreased for the last 6 years of tree growth. The maximum length and number of leaves of trunk shoots were registered for the years around 1985, when tree age was about 17 years. The likelihood of apex death for trunk shoots was minimum for the period of maximum trunk shoot size. Despite the fact that the architectural features of the sampled trees corresponded to those of young, vigorously growing trees, they seemed to have reached a stage of low annual height growth. A sharp decrease in trunk shoot size occurred in 1992, a year in which rainfall during the growing season reached the minimum for the lifetime of the sampled trees. The size of shoots developed after 1992 was, on average, lower than that of shoots developed before 1992. Stressful conditions in this year may relate to meristem ageing and thus to the size of shoots formed in the following years. Main branches started their development with shoots similar to those of the trunk but were clearly differentiated from the trunk 5 years later. The differentiation between main branch and trunk shoots involved not only a lower shoot size but also a higher number of leaves per shoot length unit in main branch than in trunk shoots.Key words: Nothofagus pumilio, architectural analysis, shoot, trunk development, branching pattern, morphogenetic gradient.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".