Bibliographic record
Abstract
Objectives of the research were to determine the extent of internal cycling of N itrogen (N) in Leymus chinensis grasslands using the compartment model method. The internal ecosystem was divided into five compartments: (i) Above_gro und N, (ii) Standing dead and litter N, (iii) Living root N, (iv) Soil organic N , and (v) Soil mineral N. Above_ground biomass was harvested from five 1 m ×1 m quadrats in each plot whi le the underground biomass was collected from 25 cm×25 cm sections at 30 cm so il depth. The soil samples were washed, and dead roots were separated from livin g roots. Soil N for total N and mineral N test was sampled at two depths (0_15 c m a nd 15_30 cm). The above samples were collected at 4 weeks intervals between mid _ April to mid_September with five replications. Standing dead and litter were col lected from five 1 m×1 m quadrats in mid_October, 1994, each 100 g of the sampl es was put into one nylon net bags, total 30 bags of the samples were randomly s cattered on grassland soil surface, and 5 samples were collected every month fro m mid_April to mid_Sep, in 1995. The remaining samples were weighed and N conten t was tested for each sample. The total N of plant and soil was measured using Kjeldahl digestion method. The amounts of NH + 4_N and NO - 3_N measured by distillation method. The r esult indicated that the soil_plant system contained 479.2 g·m -2 of N, ne arly all in the orga nic form. The plant available N, about 1.5% of total N in the forms of NH + 4 and NO - 3, the seasonal changes of the two forms were great, the storage of soil mineral compartment was between 2.55 11.3 g·m -2 ,and the content of NO - 3 N wa s even higher than NH + 4 N, which is different from the other type grassland s, where the peak of NH + 4_N contents appeared earlier than that of NO - 3_N cont ents. Pla nt root uptook N 3.48 g·m -2 ·a -1 , the above_ground took up N 2.97 g ·m -2 ·a -1 , the N re_translocation was about 1.54 g·m -2 ·a -1 from above_ground to root. The N of above _ground biom ass that turned to litter N is 1.43 g·m -2 ·a -1 . Approximately 1.08 g·m -2 ·a -1 N in litter changed to soil organic N, and 1.51 g·m -2 ·a -1 of N from the root changed into soil organic N. Comparison between Canadian mixed prairie and Northeast China L. chinensis g rasslands indicates that the utilization efficiency of soil N for grasses is low er in L. chinensis grasslands than that in Canadian mixed prairie.
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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".