Leaf anatomy and chlorophyll content of 12 woody species in contrasting light conditions in a Bornean heath forest
Why this work is in the frame
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Bibliographic record
Abstract
This paper reports the anatomy, chlorophyll content, and some optical properties of leaves of 12 tree species in sun and shade conditions in a tropical heath forest in Brunei (northern Borneo). These plants displayed some xeromorphic leaf features, e.g., relatively low stomata density compared with lowland rain forest plants and sun leaves usually with two or more layers of palisade cells. Most species displayed substantial plasticity in leaf structure and chlorophyll concentration in response to different light conditions. Dipterocarp leaves had thinner palisade mesophyll and greater spongy to palisade thickness ratios than non-dipterocarp leaves. The chlorophyll content per unit leaf area of the species studied was within the range quoted for American tropical rainforest trees. Their chlorophyll a : chlorophyll b ratios, however, were much lower than those for forest plants in humid temperate and subtropical regions. This could be attributed to the regular soil water deficits of this forest. Despite large variation in leaf structure and chlorophyll concentration among species and within species on the two distinct conditions, their absorptance of photosynthetic active light was similar. Chlorophyll concentration per unit weight was adversely and nonlinearly related to leaf thickness for the data pooled from all species in both light conditions (R 2 = 0.49, P < 0.001).Key words: chlorophyll concentration, leaf anatomy, kerangas, light acclimation, leaf plasticity, tropical heath forest.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| 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) | 0.000 | 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 it