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| 论文题目: |
Nitrogen availability influences microbial reduction of ferrihydrite-organic carbon with substantial implications for exports of iron and carbon from peatlands |
| 英文论文题目: |
Nitrogen availability influences microbial reduction of ferrihydrite-organic carbon with substantial implications for exports of iron and carbon from peatlands |
| 第一作者: |
Qin, Lei |
| 英文第一作者: |
Qin, L |
| 联系作者: |
姜明 |
| 英文联系作者: |
Jiang，M |
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| 发表年度: |
2020 |
| 卷: |
153 |
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| 摘要: |
While iron (Fe) has been proposed to constrain dissolved organic carbon (DOC) export by forming precipitation (Fe-OC) in peatlands, uncertainties remain about the potential interactions between Fe and nitrogen. Such interactions are important for Fe and carbon exports as they can dissolve the Fe-OC through Fe reduction. Here we studied the reduction of ferrihydrite-OC (Fh-OC) following incubation with microbes from agricultural and natural peatlands under differing nitrogen availability, with high-throughput sequencing to identify microbial mechanisms. Our results showed that in agricultural peatlands, high nitrogen levels (100 mg kg(-1)) modified the composition and abundance of iron-reducing bacteria, increasing reduction rates of Fh-OC (0.09-0.20 kg Fe day(-1) ha(-1)) above the low N treatments (< 100 mg kg(-1)) (p < 0.05). However, reduction rates of Fh-OC and iron-reducing community in natural peatlands were far less affected. Our findings suggest that N-induced microbial reduction of Fe-OC may create the potential for greater Fe and carbon exports from agricultural peatlands to aquatic systems. |
| 英文摘要: |
While iron (Fe) has been proposed to constrain dissolved organic carbon (DOC) export by forming precipitation (Fe-OC) in peatlands, uncertainties remain about the potential interactions between Fe and nitrogen. Such interactions are important for Fe and carbon exports as they can dissolve the Fe-OC through Fe reduction. Here we studied the reduction of ferrihydrite-OC (Fh-OC) following incubation with microbes from agricultural and natural peatlands under differing nitrogen availability, with high-throughput sequencing to identify microbial mechanisms. Our results showed that in agricultural peatlands, high nitrogen levels (100 mg kg(-1)) modified the composition and abundance of iron-reducing bacteria, increasing reduction rates of Fh-OC (0.09-0.20 kg Fe day(-1) ha(-1)) above the low N treatments (< 100 mg kg(-1)) (p < 0.05). However, reduction rates of Fh-OC and iron-reducing community in natural peatlands were far less affected. Our findings suggest that N-induced microbial reduction of Fe-OC may create the potential for greater Fe and carbon exports from agricultural peatlands to aquatic systems. |
| 刊物名称: |
APPLIED SOIL ECOLOGY |
| 英文刊物名称: |
APPLIED SOIL ECOLOGY |
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| 参与作者: |
Tian, Wei；Yang, Liang；Freeman, Chris |
| 英文参与作者: |
Tian, Wei；Yang, Liang；Freeman, Chris |
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