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Background <p>Although the effects of straw returning or plastic film mulching on soil N<sub>2</sub>O emissions and crop yields have been widely reported, the interactive effects and influence mechanisms were still unknown.</p> Methods <p>A 2-year field experiment was developed to explore the interactive influence mechanism of straw and film mulching on N<sub>2</sub>O emission and garlic yield in the humid to semi-humid monsoon climate zone. Six treatments were designed, including two main treatments, straw returning (SR) and non-straw returning (NR), and three sub-treatments: no mulch (CK), polyethylene film (PM), and fully biodegradable film (BM).</p> Results <p>Compared to NR, SR significantly reduced N<sub>2</sub>O emissions by an average of 57.25%. In contrast, the impact of film mulching on N<sub>2</sub>O emissions was greatly influenced by interannual variations. Garlic yield was primarily significantly influenced by film mulching, with PM and BM increasing yields by 26.36% and 21.71%, respectively, compared to CK. The interaction between straw and film mulching had a significant effect on N<sub>2</sub>O emissions and yield-scaled N<sub>2</sub>O emissions. SR-BM achieved the lowest N<sub>2</sub>O and yield-scaled N<sub>2</sub>O emissions, reducing them by 39.27% and 63.64%, respectively versus NR-CK, but without significant difference from SR-PM. Significant and positive correlations were observed between N<sub>2</sub>O emissions and soil NO<sub>3</sub><sup>−</sup>-N, AOA-<i>amoA</i>, AOB-<i>amoA</i>, and (nirS + nirK)/nosZ ratio. Additionally, the interactive effect of SR-PM and SR-BM on N<sub>2</sub>O emissions was mainly regulated by the (nirS + nirK)/nosZ, followed by NO<sub>3</sub><sup>−</sup>-N, temperature, and moisture.</p> Conclusion <p>SR-BM synergistically reduced N<sub>2</sub>O emissions via denitrification regulation without compromising yields, offering a sustainable practice for garlic systems.</p>

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Straw incorporation with biodegradable film mulching could reduce N2O emission while sustaining crop yield in a garlic field

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • Naijuan Hu,
  • Qian Chen,
  • Anmin Zhang,
  • Jide Fan,
  • Guang Han,
  • Hongwu Sun

摘要

Background

Although the effects of straw returning or plastic film mulching on soil N2O emissions and crop yields have been widely reported, the interactive effects and influence mechanisms were still unknown.

Methods

A 2-year field experiment was developed to explore the interactive influence mechanism of straw and film mulching on N2O emission and garlic yield in the humid to semi-humid monsoon climate zone. Six treatments were designed, including two main treatments, straw returning (SR) and non-straw returning (NR), and three sub-treatments: no mulch (CK), polyethylene film (PM), and fully biodegradable film (BM).

Results

Compared to NR, SR significantly reduced N2O emissions by an average of 57.25%. In contrast, the impact of film mulching on N2O emissions was greatly influenced by interannual variations. Garlic yield was primarily significantly influenced by film mulching, with PM and BM increasing yields by 26.36% and 21.71%, respectively, compared to CK. The interaction between straw and film mulching had a significant effect on N2O emissions and yield-scaled N2O emissions. SR-BM achieved the lowest N2O and yield-scaled N2O emissions, reducing them by 39.27% and 63.64%, respectively versus NR-CK, but without significant difference from SR-PM. Significant and positive correlations were observed between N2O emissions and soil NO3−-N, AOA-amoA, AOB-amoA, and (nirS + nirK)/nosZ ratio. Additionally, the interactive effect of SR-PM and SR-BM on N2O emissions was mainly regulated by the (nirS + nirK)/nosZ, followed by NO3−-N, temperature, and moisture.

Conclusion

SR-BM synergistically reduced N2O emissions via denitrification regulation without compromising yields, offering a sustainable practice for garlic systems.