CO₂-induced alterations in plant nitrate utilization and root exudation stimulate N₂O emissions

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• 作者：Keke Wu^a ; ^b ; ^{kekewu121@163.com} ; Dima Chen^b ; ^c ; ^{chendima@ibcas.ac.cn} ; Cong Tu^b ; ^{ctu2@ncsu.edu} ; Yunpeng Qiu^b ; ^{yqiu4@ncsu.edu} ; Kent O. Burkey^d ; ^e ; ^{Kent.Burkey@ars.usda.gov} ; S. Chris Reberg-Horton^e ; ^{chris_reberg-horton@ncsu.edu} ; Shaolin Peng^a ; ^{lsspsl@mail.sysu.edu.cn} ; Shuijin Hu^b ; ^{shu4@ncsu.edu}
• 关键词：Elevated CO2 ; Root exudation ; Nitrous oxide ; 15N tracer ; Ammonium nitrogen (NH4+-N) ; Nitrate nitrogen (NO3&minus ; -N) ; Fertilization management
• 刊名：Soil Biology and Biochemistry
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：106
• 期：Complete
• 页码：9-17
• 全文大小：973 K
• 卷排序：106

文摘

Elevated CO2 stimulation of soil N2O emissions was observed under both wheat and tall fescue. The form of N inputs dominated elevated CO2 effect on soil N2O emissions. Elevated CO2 stimulation of N2O emission only occurred when NO3−-N was present as the primary N source. eCO2-inhibition of plant NO3−-N utilization and/or eCO2-enhancement of soil labile carbon enhanced N2O emissions.