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

发表年度:

2020

卷:

153

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

参与作者:

Tian, Wei；Yang, Liang；Freeman, Chris

英文参与作者:

Tian, Wei；Yang, Liang；Freeman, Chris