Managing periphytic biofilms transforms the nitrogen cycle in rice paddies

## Overview This repository contains the source data, analysis code, model inputs, and figures supporting the manuscript: > **Managing periphytic biofilm as a temporal nitrogen buffer reduces reactive nitrogen losses from rice paddies** The study integrates multi-site field experiments (8 stations, 2024–2025), a national periphytic biofilm (PB) database (1,080 samples, 26 sites, 2015–2019), ¹⁵N isotope tracing, and a process-based PB-DNDC coupling model to quantify PB-mediated nitrogen cycling in Chinese rice paddies. ## Directory Structure ```DOI_package/├── Source_Data/ ← Per-figure source data (CSV/Excel)├── Field_Experiment_Data/ ← Raw field measurements (8 sites)├── National_PB_Database/ ← 1,080-sample national PB survey├── N15_Isotope_Data/ ← ¹⁵N isotope tracing (3 regions)├── Code/ ← Analysis scripts (Python 3.12)│ ├── 01_generate_main_figures.py│ ├── 02_generate_supplementary_figures.py│ ├── 03_PB_DNDC_daily_coupling.py│ ├── 04_PB_DNDC_model_calibration.py│ ├── 05_county_level_upscaling.py│ ├── 06_SSP_scenario_analysis.py│ ├── 07_Sobol_sensitivity_analysis.py│ ├── 08_prepare_submission_data.py│ └── requirements.txt```