Date of Award

9-1-2025

Degree Type

Thesis

Degree Name

Master of Science (M.S.)

Department

Biological Sciences

First Advisor

Dafeng Hui

Abstract

Global crop residue production was substantial, at approximately 3758 × 106 mg annually. The practice of straw return, was found to enhance soil organic matter content, increase crop yield, and mitigate soil greenhouse gas emissions. However, individual studies showed inconsistent results. While meta-analyses synthesized multiple individual studies and provided overall effects of straw return, but their conclusions were varied. We evaluated meta-analyses on the effects of straw return on crop yield, soil organic carbon, and greenhouse gas emissions and proposed a grand mean response ratio to estimate an overall effect and the impacts of different properties. The result showed that due to straw returns, overall crop yield increased by 15.9%, soil organic carbon by 9%. There was a trend of increasing N2O emissions. Straw return also had no significant overall effect on CH₄ emissions, and its response ratio was 6%. This study concentrated solely on the N₂O and methane CH₄ emissions, due to these exhibits greater greenhouse gas potency than CO₂ regarding global warming potential (GWP). Numerous agricultural practices significantly impacted on N₂O and CH₄ emissions. These data underscored the predominantly beneficial impacts of straw return on crop production and soil organic carbon, while suggesting its effect on greenhouse gas emissions was ambiguous, especially for N₂O and CH₄ emissions.

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