Assessing seasonal drought stress response in Norway spruce (<i>Picea abies</i> (L.) Karst.) by monitoring stem circumference and sap flow
Why this work is in the frame
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Bibliographic record
Abstract
Abstract Summer drought frequency is expected to increase with climate change in forested regions of Europe. To examine the physiological impacts of low soil moisture on Norway spruce [ Picea abies (L.) Karst.], we conducted an irrigation experiment in a Norway spruce‐dominated forest. We monitored sap flow ( Q s ), stem circumference and soil water potential ( Ψ w ), measured needle water potential ( Ψ l ), and estimated potential evapotranspiration (PET) in control and irrigated plots. Soil water availability influenced the response of Q s to PET and the impact of Q s on maximum daily stem shrinkage (MDS). The positive relationship between Q s and PET was constrained below a threshold Ψ w near −0.3 MPa. MDS was higher beyond this threshold, for a given value of Q s . Higher MDS and lower tree water status ( Δ W) were observed at low Ψ w in control plants, suggesting the lower water potential of stems' conducting tissues. Stem circumference increase (SCI) was 62% lower in control trees following the irrigation treatment. Slight SCI recovery was observed in these trees in response to early autumn rainfall, which caused Δ W to return to its predrought state. The results demonstrate that low water availability not only reduced Q s , Δ W, SCI, Ψ l and increased MDS but also altered their mutual relations. Copyright © 2014 John Wiley & Sons, Ltd.
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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 | 0.001 | 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