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August 23, 2026Industrial Crops and ProductsOpen Access

Synergistic effect of intercropping and straw incorporation on soil carbon sequestration

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Authors

YZYi‐Wen ZhaoHZHao-Fei ZHENGJSJian-Hao Sun

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Overview

A 12-year field study reveals that combining intercropping with straw incorporation boosts soil carbon sequestration, indicating enhanced microbial pathways drive carbon stabilization.

Key Points

  • To determine whether combining intercropping and straw incorporation produces synergistic effects on soil organic carbon sequestration and to uncover the microbial and micro-food web mechanisms involved.
  • Conducted a 12-year field experiment in Gansu Province evaluating residue management (straw removal vs. straw incorporation) across monocultures (pea, maize) and pea/maize intercropping.
  • Measured soil organic carbon fractions, microbial biomass carbon, and carbon-acquiring enzyme activities.
  • Performed amplicon and metagenomic sequencing alongside network analysis to evaluate microbial interactions and carbon-cycling functional genes.
  • Intercropping increased soil organic carbon by 3.7% and mineral-associated organic carbon by 4.8% compared to monoculture, while straw incorporation increased them by 18.6% and 19.5% compared to straw removal.
  • Intercropping significantly increased microbial biomass carbon concentration and carbon-acquiring enzyme activities only under straw incorporation.
  • Straw incorporation combined with intercropping enhanced protist-mediated interactions, keystone taxa, and metagenomic carbon-cycling and carbon-fixation gene abundance.

Cite This Study

Zhao et al. (2026) studied this question.

synapsesocial.com/papers/6a8aad417677a3411444574fhttps://doi.org/10.1016/j.indcrop.2026.124203
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Also Consider

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  1. 1Layer-specific straw incorporation regulates subsoil organic carbon accrual and stabilization pathways in Northeast China cropland2026
  2. 2Impact of straw-biochar amendments on microbial activity and soil carbon dynamics in wheat-maize system2024 · 49 citations
  3. 3Straw Application Rate and Duration Affect Soil Aggregate Composition and Soil Organic Carbon: A Meta-Analysis Based on Field Experiments in Mainland China2026
  4. 4The Microbial mechanisms of soil organic carbon pool transformation under long-term chemical fertilizer and straw application: Insights from an 18-year field experiment2026
  5. 5Maize-soybean rotation with straw return improves carbon stabilization efficiency by distinctively allocating soil carbon pool fractions in northeast China2026