Energy retention from plant leaves by soil along an elevational gradient in arid mountain ecosystems
Bibliographic record
Abstract
• Energy density conversion ratio (ED SOM/Leaf-OM ) is < 1 in warm-dry areas. • ED SOM/Leaf-OM remains 1 in cold-wet areas. • ED SOM/Leaf-OM decreases with the Exo2/Exo1 ratio of plant leaf in cold-wet areas. • ED SOM/Leaf-OM decreases with the Exo2/Exo1 ratio of soil organic matter in warm-dry areas. Plant photosynthetic products are microbially and chemically transformed and retained as soil organic matter (SOM), which is essential for ecosystem functioning, particularly in the detritusphere. The energy quantity (EQ) of an organic substance, defined as the net energy release per gram of the sample, depends on its OM content and the energy density (ED, the net energy release per gram of OM). During the transformation of plant leaves to SOM, both the energy quantity retention ratio (EQ Soil/Leaf , the ratio of soil’s EQ to leaves’ EQ) and the OM retention ratio (OM Soil/Leaf , the ratio of SOM to leaves’ OM) are consistently less than one, reflecting the loss of OM as CO 2 and coupled heat dissipation. However, how the energy density conversion ratio (ED SOM/Leaf-OM ) changes and its influence on EQ Soil/Leaf ratio remain unknown. Here, we 1) examined the ED SOM/Leaf-OM ratio along an elevation gradient (481–3035 m), where environmental conditions shift from warm-dry to cold-wet, and 2) explored how the ED SOM/Leaf-OM ratio was influenced by chemical composition (e.g., the H/C and C/N ratios of plant leaves, the ratio of stable-to-labile OM thermal pool (Exo2/Exo1)), climate, and edaphic factors. The ED SOM/Leaf-OM ratio was < 1 (0.7 ± 0.04) in warm-dry areas, indicating the decrease in OM’s energy density from plant leaves to SOM, whereas it remained 1 (1.0 ± 0.1) in cold-wet areas. In warm-dry areas, the ED SOM/Leaf-OM ratio decreased with the ratio of themal pools Exo2/Exo1 of SOM due to the protection of low-energy–density OM by Fe/Al oxides. Conversely, in cold-wet areas, ED SOM/Leaf-OM declined with increasing Exo2/Exo1 ratio of leaf, which was featured by low H/C and high C/N ratio. The ED SOM/Leaf-OM ratio modulates energy retention as OM Soil/Leaf in cold-wet areas, underlining the dynamics of SOM energy beyond mass loss. This study highlights that energy retention during SOM formation is environment-sensitive, mediated by two mechanisms: mineral protection in warm-dry areas versus biochemical transformation in cold-wet areas. We recommend integrating energy and mass flux assessments to better understand OM decomposition, stabilization, and ecosystem carbon storage.
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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".