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September 3, 2026European Journal of Soil ScienceOpen Access

Deep Straw Incorporation Reduces Soil CO 2 Emission Increments Caused by Rainfall Events

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Authors

MYMengdi YangXLXiaogang LiWLWanwan Lv

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Overview

Simulation experiment reveals that deep straw incorporation reduces rainfall-induced carbon dioxide emissions in agricultural soil, indicating enhanced carbon sink potential.

Key Points

  • To evaluate how deep straw incorporation influences soil carbon dioxide dynamics across vertical soil profiles under contrasting rainfall patterns.
  • Conducted a soil column simulation experiment evaluating three straw treatments: no straw (CK), shallow incorporation (0–20 cm), and deep incorporation (0–40 cm).
  • Applied two distinct rainfall patterns: frequent small events (30 events of 10 mm each) and infrequent heavy events (4 events of 75 mm each).
  • Quantified CO2 concentrations, CO2 surface fluxes, soil moisture, readily oxidizable organic carbon (ROC), and microbial extracellular enzyme activities across soil depths.
  • Cumulative CO2 emissions under deep straw incorporation decreased by 26.4%–36.3% compared to shallow incorporation, while CO2 concentration at 20–40 cm depth was 36.3%–82.3% higher.
  • The increase in cumulative CO2 emissions stimulated by 75 mm rainfall events was lower under deep incorporation (15.5%–16.6%) than under shallow incorporation (20.6%–23.8%).
  • The ratio of CO2-C to straw-C inputs following 75 mm rainfall events decreased from 16.9%–36.4% under shallow incorporation to 8.6%–17.6% under deep incorporation.

Cite This Study

Yang et al. (2026) studied this question.

synapsesocial.com/papers/6a993600636c6408cfa7ec5ehttps://doi.org/10.1111/ejss.70410
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