Light transmission and understory vegetation in two old-growth riparian stands : a study in spatial pattern
Why this work is in the frame
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Bibliographic record
Abstract
Characterizing the structure of old-growth forests is crucial to understanding their ecological dynamics.I examined canopy openness, understory gap-light, and understory vegetation in two old-growth floodplain stands in southwestern British Columbia.The younger stand was in the "horizontal diversification" stage, and the older stand was in the "pioneer cohort loss" stage and contained a large vine maple gap.I determined spatial patterning of canopy openness and understory gap-light using hemispheric photography at closely spaced (2m) photosites on perpendicular transects, and explored how gap-light transmission, space, and distance from water features affected understory vegetation composition.The frequency distribution of light and openness values in the older stand had a mode at low values in conifer-dominated areas undergoing pioneer cohort loss, and a long tail of variable and higher values in the vine maple gap.The younger stand exhibited a bimodal distribution.Spatial autocorrelation of light and canopy openness values between photosites was clearly significant on all transects, with positive spatial autocorrelation significant to at least 12.5 metres in all cases.Depending on the goals of future studies in similar forests, either a sampling step of 30m or a systematic cluster sampling design is recommended.Patterns of understory gap-light on the transects varied over the small scale of 100m, a scale considerably smaller than the typical scale of forest management in British Columbia.Comparatively high and spatially and temporally variable values of gap-light transmission in the vine maple gap, combined with a distinct understory community in the vine maple gap, reaffirm the ecologically distinct role of vine maple in coastal temperate rainforests of the Pacific Northwest.Multivariate analysis showed that gapiii light transmission did not have a large influence on understory composition at the measurement scale of this study.I n the younger stand, distance to small streams explained some of the variation in understory communities.Restoration efforts aiming to re-establish old-growth conditions in floodplain forests of the Pacific Northwest need to account for variable overstory spatial pattern over small scales (loom), the distinct role of hardwood patches such as vine maple gaps, and the influence of small streams on understory plant communities.This project is the culmination of the combined efforts of so many people they are almost too numerous to list.I extend my deepest gratitude to Ken Lertzman and Gord Frazer, both of whom were always willing to answer my questions and guide my progress.Thanks are also due to
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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 | 0.001 |
| 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) | 0.000 | 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