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Disproportional oxidation rates of ammonia and nitrite deciphers the heterogeneity of fertilizer-induced N2O emissions in agricultural soils
Soil Biology and Biochemistry ( IF 9.7 ) Pub Date : 2024-01-29 , DOI: 10.1016/j.soilbio.2024.109325 Yue Li , Zhujun Wang , Xiaotang Ju , Di Wu
Soil Biology and Biochemistry ( IF 9.7 ) Pub Date : 2024-01-29 , DOI: 10.1016/j.soilbio.2024.109325 Yue Li , Zhujun Wang , Xiaotang Ju , Di Wu
Nitrous oxide (NO) is a potent greenhouse gas and ozone-depleting chemical. Although nitrogen (N) fertilizer rate is the best single predictor of NO emissions, the spatial heterogeneity of the emission factor is striking and poorly understood. Nitrite (NO) dynamics have been reported to be correlated with NO production in many soils; however, NO is often overlooked owing to its rare accumulation, and the underlying mechanisms of NO accumulation and the relationship with spatiotemporal heterogeneity of NO emissions in response to N addition remains unclear. Here, we collected upland agricultural soils that cover the main upland agricultural production regions of China and investigated the soil-specific effects on NO emissions, changes in microbial abundances and community structures of nitrifiers, and co-occurrence networks for ammonium (NH)-based fertilizer addition. Our results showed that high NO accumulation and high NO emissions were generally correlated with low /AOB gene ratios (R = 0.90 and 0.86, respectively, < 0.01). Further network analyses revealed that NH addition increased the network links of the nitrification functional communities by 23% and enhanced the interrelationship between AOB and nitrite oxidizers. By synthesizing our data with previous studies in the literature, we found that soil NO emission rate and /AOB gene ratio exhibit a threshold behavior worldwide, suggesting that disproportionality of NH and NO oxidations rates are involved in the heterogeneity of fertilizer-induced NO emissions in agricultural soils. These findings enhance our understanding of spatiotemporal heterogeneity in NO accumulation and NO emissions within upland agricultural soils in view of nitrification functional communities.
更新日期：2024-01-29
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