Plant diversity but not productivity is associated with community mycorrhization in temperate grasslands
Bibliographic record
Abstract
Abstract Aims Mycorrhizal symbiosis influences the performance of plant individuals. However, its impact on plant communities is less well understood. We used a database of plant mycorrhizal traits and investigated how community mycorrhization — the prevalence of mycorrhizal symbiosis in plant communities — is related to plant community productivity and diversity. We analysed: (a) how soil fertility affects community mycorrhization; (b) how plant productivity and diversity are related to community mycorrhization; and (c) whether community mycorrhization directly mediates the relationships between soil fertility and plant productivity and diversity. Location Twenty‐nine semi‐natural grasslands in the south of Estonia, representing a steep productivity gradient (80–500 g/m 2 ). Methods We estimated the proportion of plant biomass associated with mycorrhizal symbiosis (arbuscular mycorrhization index, AMI). The relationships between soil fertility (soil nitrogen [N], phosphorus [P] and potassium [K], accounting for soil moisture and pH), AMI, plant diversity and productivity were analysed using model averaging and pairwise generalized linear models, and support for direct relationships was determined using path analysis. Results There was a positive linear relationship between soil nitrogen and AMI. In turn, plant biomass showed positive, and plant diversity negative linear relationships with AMI. Path analyses indicated that AMI mediates the relationship between soil nitrogen and plant diversity, but not the relationship between soil nitrogen and plant community productivity. Plant productivity and mycorrhization increased along the soil fertility gradient, but plant diversity decreased. Conclusion These results suggest that community mycorrhization, which is sensitive to soil fertility (N), can modulate community composition in temperate grasslands, probably by enhancing the most dominant plant species in the community.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| 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".