Different effects of warming and cooling on the decomposition of soil organic matter in warm–temperate oak forests: a reciprocal translocation experiment
Bibliographic record
Abstract
A reciprocal soil monolith-transfer experiment was conducted along an altitude gradient to investigate the effect of climate change on soil carbon (C) processes in two warm–temperate oak forests in Baotianman Nature Reserve, Henan Province, China. Microclimate conditions, soil surface CO2 flux, and labile organic C were measured for in-situ and transferred soils at both high and low-elevation sites. The soil temperature at 5 cm depth was, on average, 3.27 °C warmer at the low-elevation site than at the high-elevation site. Net CO2 flux (911 g C m−2 13 months−1, 4.7 % of total C) of soil monoliths transferred from the high to the low-elevation site (simulating warming) was substantially (44 %) greater than for high-elevation soil monoliths incubated in situ (633 g C m−2 13 months−1, 3.3 % of total C) during 13 months of incubation. Increased extractable organic C (K2SO4-C) supply with warming partly explained the increase of soil CO2 flux. Simulated warming also significantly increased the temperature sensitivity (Q 10 values) of soil organic matter decomposition. The positive linear relationship between microbial metabolic quotient (qCO2) and Q 10 suggests a connection between microbial population and Q 10 under warming conditions. Transfer of soil monoliths from the low to the high-elevation site (simulating cooling) substantially (30 %) reduced soil CO2 flux (383 g C m−2 13 months−1, 2.5 % of total C) compared with those incubated in situ (550 g C m−2 13 months−1, 3.5 % of total C). However, this was not accompanied by consistently opposite changes, to a similar extent, in labile organic C (microbial biomass carbon and K2SO4-C) and decomposition results (i.e., Q 10 and R 10, soil respiration at 10 °C), indicating that the soil organic matter decomposition process may not respond equally to cooling and warming. Different soil organic matter decomposition responses to cooling and warming should be considered for paleoecological modeling when both warming and cooling are involved in the changes in regional and global climates, particularly during the Holocene.
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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".