Effects of elevated atmospheric carbon dioxide concentration on nitrification of farmland soil
It has been widely reported that elevated carbon dioxide concentration (eCO<sub>2</sub>) affects soil nitrogen cycling dramatically, in which nitrification plays an important role in net primary productivity and greenhouse gas emission. However, the general patterns of soil nitrification...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2022-08-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/j.issn.1008-9209.2021.02.082 |
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| Summary: | It has been widely reported that elevated carbon dioxide concentration (eCO<sub>2</sub>) affects soil nitrogen cycling dramatically, in which nitrification plays an important role in net primary productivity and greenhouse gas emission. However, the general patterns of soil nitrification and ammonia oxidizers in response to eCO<sub>2</sub> remain uncertain. Here we performed a global meta-analysis to explore the effects of eCO<sub>2</sub> on soil nitrification in agroecosystems and underlying microbial mechanisms. Our results showed that eCO<sub>2</sub> significantly increased potential nitrification rate (PNR), nitrous oxide (N<sub>2</sub>O) emission and ammonia-oxidizing bacteria (AOB) abundance. Climates, experimental conditions, soil properties and agricultural practices were important factors in regulating the responses of soil nitrification to eCO<sub>2</sub>. The responses of nitrification potential were positively correlated with AOB abundance, while no evidence was found for ammonia-oxidizing archaea (AOA) abundance. The eCO<sub>2</sub> response of AOB abundance was more closely related to the responses of soil nitrification than a wide range of environmental and experimental factors, as well as management practices. Furthermore, various effects of eCO<sub>2</sub> on AOB abundance were determined by soil type and CO<sub>2</sub> increase magnitude. Collectively, our results suggest that eCO<sub>2</sub> strengthens soil nitrification by increasing AOB populations in agroecosystems. |
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| ISSN: | 1008-9209 2097-5155 |