Spatial dependence of soil organic carbon mass and its relationship to soil series and topography
Bibliographic record
Abstract
Concern about the global increase in atmospheric CO 2 has focussed attention on C sequestration in soil and the influence of management practices on soil organic C (OC) stocks. Evaluation of management practices is required at scales comparable to farm management units, which encompass heterogeneous soils and different landforms. The objectives of this study were to describe the spatial dependence of soil OC mass in two adjacent fields with contrasting tillage practices on Black Chernozemic soils using geostatistics and relate it to topographic features and soil series. Mass of OC was measured for a surface layer, the A horizon and solum. The spatial dependence of OC mass was at a scale commensurate with topographic variation. Spatial analysis generally corroborated description of the sampling site by soil series, which represented differences in drainage as influenced by slope-position and redistribution of water across the landscape. Soil series alone or grouped by drainage class, therefore, provided a framework by which to stratify the site for evaluation of effects of tillage practice on OC mass and extrapolation of results to comparable sites within the same landscape. Key words: Carbon sequestration, drainage class, scale, soil series, topography
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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 | 0.000 |
| 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 | 0.001 |
| 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".