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Related Experiment Video

Updated: Jun 1, 2026

Combined Size and Density Fractionation of Soils for Investigations of Organo-Mineral Interactions
08:38

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Published on: February 15, 2019

Straw return reshapes soil organic carbon stability: A global meta-analysis.

Jianyu Tao1, Xiaoyuan Liu2, Zhongbin Zhang1

  • 1State Key Laboratory of Efficient Utilization of Arable Land in China, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.

Journal of Environmental Management
|May 30, 2026
PubMed
Summary

Straw return boosts soil organic carbon (SOC) pools, especially particulate organic carbon (POC) and microbial necromass carbon (MNC). However, it may decrease SOC stability and requires complementary practices for effective carbon sequestration.

Keywords:
Crop residueMineral-associated organic carbonParticulate organic carbonSoil C sequestration

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Area of Science:

  • Agricultural Science
  • Soil Science
  • Environmental Science

Background:

  • Straw return is a common practice for enhancing soil organic carbon (SOC) sequestration and mitigating climate change.
  • The specific impacts of straw return on different SOC pools, particularly particulate organic carbon (POC) and mineral-associated organic carbon (MAOC), require further elucidation.
  • Understanding the dynamics of various SOC fractions (e.g., dissolved organic carbon (DOC), easily oxidizable organic carbon (EOC), microbial biomass carbon (MBC), microbial necromass carbon (MNC)) is crucial for a comprehensive assessment.

Purpose of the Study:

  • To conduct a meta-analysis evaluating the responses of POC and MAOC to straw return.
  • To comprehensively assess the variations in other SOC pools under straw return conditions.
  • To identify key environmental factors and soil properties influencing POC and MAOC accumulation.

Main Methods:

  • Meta-analysis of existing studies on straw return effects on soil organic carbon pools.
  • Examination of variations in POC, MAOC, DOC, EOC, MBC, and MNC.
  • Linear regression, Shapley additive explanation (SHAP), and structural equation modeling (SEM) analyses.

Main Results:

  • Straw return significantly enhanced most SOC pools, with notable increases in POC (35.73%), EOC (41.17%), and MNC (35.59%).
  • Straw return decreased the MAOC/SOC ratio and increased EOC, indicating reduced SOC stability.
  • POC and MAOC accumulation were negatively correlated with initial soil total nitrogen (TN) and mean annual precipitation (MAP); specific thresholds were identified for TN and sand content influencing POC.

Conclusions:

  • Straw return primarily increases the labile POC pool, potentially limiting its overall contribution to stable SOC sequestration.
  • MAOC plays a dominant role in SOC sequestration under straw return, with its accumulation influenced by soil pH, straw return duration, and potential evapotranspiration (PET).
  • Integrating additional agricultural practices alongside straw return may be necessary to optimize SOC sequestration efficacy.