The influence of coarse woody debris on soil carbon and nutrient pools 15 years after clearcut harvesting in black spruce—dominated stands in northwestern Ontario, Canada
Bibliographic record
Abstract
This study was designed as a log-scale examination of the influence that decomposing coarse woody debris (CWD in situ for 15 y following harvesting) had on soil carbon and nutrient levels. The study included 4 study sites representing 2 soil types: loamy tills versus sandy outwashes. The mature, fire-origin mixed conifer stands occupying these sites were clearcut harvested in 1994. In 2009, estimates of both total soil carbon and total and available nutrient pools were compared in locations under versus away from CWD. The presence of decaying CWD (now decay classes 3–4) significantly increased soil carbon (+85%) and nitrogen (+49%) pools. Estimates of inorganic N from a fresh soil 2M KCL extraction, however, were lower underneath the logs, suggesting that N immobilization is occurring as part of the decomposition process. In contrast, the presence of CWD had no significant effect on P, K, Ca, or Mg soil pools. Although there were marked differences in soil nutrient pools between the 2 soil types, the patterns associated with the presence of CWD were largely the same, and suggest that the influence of CWD does not extend beyond the bounds of the CWD. The results suggest that it will be important that biomass harvesting guidelines consider and include CWD retention levels to ensure that this important ecosystem component, with its associated functions (e.g., soil fertility, nutrient cycling), is maintained in harvested landscapes.
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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 | 0.000 | 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 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".