Photosynthetic Characteristics of Wild Plant Species with Extremely Small Populations <i>Cycas Shiwandashanica</i>
Bibliographic record
Abstract
Cycas Shiwandashanica is classified as an extremely small populations of cycads due to its fragmented habitat and scarce wild resources. The growth indexes of annual and biennial seedlings from Cycas Shiwandashanica were determined, and diurnal photosynthetic changes and photosynthetic response curves of biennial seedlings were measured by Li-6400 portable photosynthetic apparatus. The results showed that the seedling height, ground diameter and crown width of the biennial seedlings were significantly higher than those of the annual seedlings, it can be grown well in this habitation. The daily change of net photosynthetic rate P n of Cycas Shiwandashanica was bimodal curve, with the two peaks appearing at 10:30 am and 14:30 pm, and the net photosynthetic rates were 1.73 μmol·m -2 ·s -1 and 1.76 μmol·m -2 ·s -1 , respectively, and the net photosynthetic rate was limited by stomatal factors and non-stomatal factors. It belongs to the mesophytic plant, with a light compensation point (LCP) of 3.68 μmol·m -2 ·s -1 , a light saturation point (LSP) of 1023.67 μmol·m -2 ·s -1 and a maximum photosynthetic rate ( P max ) of 3.57 μmol·m -2 ·s -1 . This study by measuring the growth potential and photosynthetic characteristics, reveals the photosynthetic characteristics of the Cycas Shiwandashanica for the first time. It provides technical support for the protection, introduction and cultivation of Cycas Shiwandashanica , provides theoretical support for the mitigation of the endangered status of Cycas Shiwandashanica , and has theoretical value and guiding significance for the protection research of it.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 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) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".