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Responses of soil bacterial composition and network complexity to O3 stress and straw return in a soybean cropland
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DOI：10.3389/fpls.2026.1846591.png)
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Abstract
En 中文
Soil microbial community and function play a key role in root nutrient acquisition and growth. Yet; the combined effects of O3 stress and straw return on soil microbial composition and network complexity remain unclear. Here; a pot experiment was conducted in open-top chambers to monitor the responses of soil microbial diversity; composition; and network complexity at branching and podding stages of soybean (Glycine max; a species highly sensitive to O3 stress) to O3 stress (45 ± 5 ppb; 80 ± 10 ppb; and 110 ± 10 ppb) and straw treatment (no straw return and straw return). Under O3 stress at 110 ± 10 ppb; SOC and microbial biomass C and N significantly increased at the branching stage and decreased at the podding stage. Under O3 stress; the Chao1 and PD indices; along with the number of observed species; were significantly increased by straw return. The bacterial network complexity was negatively affected by O3 stress (80 ± 10 ppb) and positively affected by straw return. Microbial diversity (Chao1; Shannon; and PD indices) showed greater total standard effects than the factors of soil stoichiometry (C/N; C/P; and N/P ratios). Straw return had the lowest total standard effect on microbial network community and complexity than the other factors. Collectively; the slight alleviating effect of straw return on the reduced microbial topology induced by O3 stress was mainly associated with bacterial functions rather than soil physicochemical properties.
Keywords:
bacterial community composition
bacterial diversity
Soybean
O3 stress
Straw return
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3.4W
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14.7W
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