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Divergent Changes in Soil Iron-Bound Organic Carbon Between Distinct Determination Methods.
Lei Yang1, Hui Yang1, Ganggang Sun1
1State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, Lanzhou University, Lanzhou 730020, China.
Biology
|November 27, 2024
Summary
Comparing iron-organic carbon (Fe-OC) determination methods reveals significant differences across ecosystems. Method choice and soil properties are crucial for accurate soil carbon preservation estimates.
Area of Science:
- Soil Science
- Geochemistry
- Ecosystem Science
Background:
- Iron-organic carbon (Fe-OC) complexes are vital for soil organic carbon (SOC) preservation globally.
- Existing methods for Fe-OC determination lack standardization, hindering inter-method comparisons and data reliability.
- Understanding Fe-OC variability across different land types is essential for accurate ecosystem carbon accounting.
Purpose of the Study:
- To compare the citrate-bicarbonate-dithionite (CBD) and sodium dithionite (SD) methods for Fe-OC determination.
- To analyze the uncertainties and influencing factors associated with each method across diverse soil ecosystems.
- To evaluate the impact of ecosystem type and soil properties on Fe-OC quantification and its contribution to SOC.
Main Methods:
- Analysis of 45 soil samples from wetland, grassland, and forest ecosystems.
- Application of both CBD and SD extraction methods for Fe-OC quantification.
- Utilizing random forest models to identify key factors influencing Fe-OC content.
Main Results:
- Fe-OC contributions to SOC (fFe-OC) were significantly lower in wetlands compared to grasslands and forests using both methods.
- The CBD method yielded significantly higher Fe-OC content and fFe-OC in grasslands versus the SD method.
- No significant differences in Fe-OC content were observed between CBD and SD methods in wetland and forest soils.
- Random forest analysis identified C/N, Clay%, and TC as primary drivers for Fe-OCCBD, while SOC, total nitrogen, and soil inorganic carbon influenced Fe-OCSD.
Conclusions:
- Ecosystem type significantly influences Fe-OC quantification and its role in SOC preservation.
- Soil properties like C/N, Clay%, TC, SOC, total nitrogen, and soil inorganic carbon affect Fe-OC measurements differently depending on the method used.
- Accurate soil carbon estimation models must integrate ecosystem characteristics and soil properties for reliable Fe-OC and SOC assessments.
