Procyanidin inhibited N2O emissions from paddy soils by affecting nitrate reductase activity and nirS- and nirK-denitrifier populations

A 28-day microcosm experiment was conducted using three paddy soils (an alluvial paddy soil, a loess-formed paddy soil, and a yellow clayey paddy soil) to investigate the impact of procyanidin on N 2 O emissions and associated microbial mechanisms. The efficacy of procyanidin on N 2 O emissions vari...

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Published in:Biology and fertility of soils 2021-10, Vol.57 (7), p.935-947
Main Authors: Ye, Mujun, Yin, Chang, Fan, Xiaoping, Gao, Zixiang, Chen, Hao, Tan, Li, Chang, Scott X., Zhao, Yuhua, Liang, Yongchao
Format: Article
Language:English
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Summary:A 28-day microcosm experiment was conducted using three paddy soils (an alluvial paddy soil, a loess-formed paddy soil, and a yellow clayey paddy soil) to investigate the impact of procyanidin on N 2 O emissions and associated microbial mechanisms. The efficacy of procyanidin on N 2 O emissions varied among the paddy soils tested, with an average inhibition rate ranging from 2.7% in the alluvial paddy soil to 57.1% in the loess-formed paddy soil. Furthermore, suppression of N 2 O emissions by procyanidin occurred alongside fluctuations in nitrate reductase activity and nirS - and nirK -type denitrifiers abundance. The correlation analysis indicates that nitrate reductase, clade I nirS -denitrifiers, clade I or II, and clade III nirK -denitrifiers were closely linked to N 2 O emissions. These findings provide evidence that procyanidin is capable of limiting N 2 O emissions in paddy soils by inhibiting nitrate reductase and different clades of nirS -/ nirK -denitrifiers.
ISSN:0178-2762
1432-0789
DOI:10.1007/s00374-021-01576-y