Five-Year Soil Carbon Amendment Field Experiment Data

Figshare hosts data from a 5-year field experiment on subtropical red soil evaluating organic amendments. The dataset includes results from carbon fractionation and ¹³C isotopic tracing to analyze mineral-associated organic carbon accumulation. It compares treatments substituting 20% chemical nitrogen fertilizer with biochar, cow dung, and maize straw.

Use Cases

• Analyze the relationship between amendment type and the biological integration fraction (f_OM) into the MAOC pool.
• Compare absolute soil organic carbon (SOC) accumulation percentages, such as the +133.0% from biochar treatment, across different organic inputs.
• Model the competing pathways of microbial turnover (MBC -> MAOC) and physical encapsulation (POC -> MAOC) using the provided structural equation modeling (SEM) coefficients.
• Calculate and compare normalized Carbon Sequestration Efficiency (CSE_MAOC) metrics between biochar, cow dung, and maize straw treatments.

Strengths

• Data originates from a controlled 5-year field experiment providing longitudinal insights.
• Includes specific quantitative results such as a +133.0% SOC increase from biochar and pathway coefficients (e.g., β = 0.776).
• Employs advanced methodologies including temporal carbon fractionation and ¹³C isotopic tracing.

Limitations

• The dataset is very small at 205.0 KB, indicating limited scope and likely a summary of results rather than raw observational data.
• Geographic scope is limited to a single subtropical red soil site, limiting generalizability.
• Unknown row and column structure makes direct analytical reuse for ML challenging.

Provenance

Source

Figshare, author Jian-Ying Qi.

Collection Method

Data from a 5-year field experiment with carbon fractionation and ¹³C isotopic tracing.

Time Range

5-year experiment duration.

Freshness

Last updated in March 2026.

Geography

Subtropical red soil site.