Utilizing pioneer species as a hydrological nurse crop to lower water table for reforestation of poorly drained boreal sites
Bibliographic record
Abstract
On cold and wet sites in the boreal forest, high water table and anaerobic soil conditions limit the establishment of planted white spruce. In a controlled-environment experiment we determined physiological and morphological responses of a grass Calamagrostis canadensis and two shrubs Salix planifolia and Alnus crispa to water table and soil temperature and evaluated their capacity to lower the water table on wet sites. All three species tended to grow better at the warmer soil temperatures and imperfectly drained treatments but C. canadensis actually developed the greatest leaf area in the near saturated conditions. Similarly, C. canadensis and A. crispa had greatest transpiration rates in the imperfectly drained and warm soil treatments. In contrast, S. planifolia had the greatest transpiration at 5 C soils. We suggest that C. canadensis is suitable as a hydrological nurse species on these wet sites, but in light of its competitive nature, the shrubs particularly S. planifolia would be preferable. competition / flooding / regeneration / soil temperature / water-use Rsum -Utilisation d'espces pionnires susceptibles de jouer un rle hydrologique en abaissant le niveau du plan d'eau pour faciliter le boisement de stations borales mal draines. Dans les stations froides et humides de la fort borale, le haut niveau du plan d'eau et les conditions d'anarobie du sol sont dfavorables au reboisement en pica blanc. Une exprimentation en milieu contrl a permis de dterminer les rponses physiologiques et morphologiques d'une espce herbace Calamagrostis canadensis et de deux arbustes, Salix planifolia et Alnus crispa, au niveau du plan d'eau et la temprature du sol, et d'valuer leur capacit abaisser le niveau du plan d'eau sur stations humides. Les trois espces tendent mieux se dvelopper avec les traitements o la temprature du sol est plus leve avec drainage mdiocre ; mais C. canadensis prsente un dveloppement de surface foliaire nettement plus grand dans des conditions de sol proches de la saturation. De mme, pour C. canadensis et A. crispa on enregistre les taux de transpiration les plus levs pour les traitements sol chaud et drainage mdiocre. Par contre, S. planifolia manifeste un maximum de transpiration avec une temprature du sol de 5 C. Nous suggrons que C. canadensis peut jouer le rle d'espce nurse hydrologique sur ces stations humides ; mais compte tenu des problmes de concurrence, on devrait prfrer les arbustes, et en particulier S. planifolia.
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How this classification was reachedexpand
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 | 0.001 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".