Labile Carbon from Artificial Roots Alters the Patterns of N2O and N2 Production in Agricultural Soils

被引:4
作者
Song, Xiaotong [1 ]
Parker, John [2 ]
Jones, Stephanie K. [2 ]
Zhang, Limei [1 ]
Bingham, Ian [2 ]
Rees, Robert M. [2 ]
Ju, Xiaotang [3 ]
机构
[1] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
[2] SRUC, Edinburgh EH9 3JG, Scotland
[3] Hainan Univ, Sch Trop Agr & Forestry, Haikou 570228, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
N2O; N-2; continuous labileC addition; artificial root; N-15-labeledurea; soil pH; OXIDE EMISSIONS; DIFFERENT WATER; USE EFFICIENCY; NITROGEN; DENITRIFICATION; EXUDATE; QUANTIFICATION; MECHANISMS; CO2; NO;
D O I
10.1021/acs.est.3c10833
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Labile carbon (C) continuously delivered from the rhizosphere profoundly affects terrestrial nitrogen (N) cycling. However, nitrous oxide (N2O) and dinitrogen (N-2) production in agricultural soils in the presence of continuous root C exudation with applied N remains poorly understood. We conducted an incubation experiment using artificial roots to continuously deliver small-dose labile C combined with N-15 tracers to investigate N2O and N-2 emissions in agricultural soils with pH and organic C (SOC) gradients. A significantly negative exponential relationship existed between N2O and N-2 emissions under continuous C exudation. Increasing soil pH significantly promoted N-2 emissions while reducing N2O emissions. Higher SOC further promoted N-2 emissions in alkaline soils. Native soil-N (versus fertilizer-N) was the main source of N2O (average 67%) and N-2 (average 80%) emissions across all tested soils. Our study revealed the overlooked high N-2 emissions, mainly derived from native soil-N and strengthened by increasing soil pH, under relatively real-world conditions with continuous root C exudation. This highlights the important role of N2O and N-2 production from native soil-N in terrestrial N cycling when there is a continuous C supply (e.g., plant-root exudate) and helps mitigate emissions and constrain global budgets of the two concerned nitrogenous gases.
引用
收藏
页码:3302 / 3310
页数:9
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