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Nitrogen and carbon addition changed nitrous oxide emissions from soil aggregates in straw-incorporated soil

文献类型： 外文期刊

作者： Yin, Junhui 1 ; Liu, Rui 1 ; Cao, Wenchao 2 ; Zhu, Kun 3 ; Fenton, Owen 4 ; Guo, Jingheng 1 ; Chen, Qing 1 ;

作者机构： 1.China Agr Univ, Coll Resources & Environm Sci, Beijing Key Lab Farmyard Soil Pollut Prevent Cont, Beijing 100193, Peoples R China

2.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Haikou 571101, Hainan, Peoples R China

3.China Agr Univ, Coll Land Sci & Technol, Beijing 100193, Peoples R China

4.TEAGASC, Environm Res Ctr, Johnstown Castle, Wexford, Ireland

关键词： Soil aggregate-related N2O; Straw incorporation; Aggregate fraction; Nitrogen and organic carbon addition; Protected vegetable field

期刊名称：JOURNAL OF SOILS AND SEDIMENTS （ 影响因子：3.308； 五年影响因子：3.587 ）

ISSN： 1439-0108

年卷期：

页码：

收录情况： SCI

摘要： Purpose The effects of straw incorporation on soil nitrous oxide (N2O) emission at the soil aggregate scale have yet to be elucidated, especially with supplemental nitrogen (N) and/or organic carbon (OC). The objective of this study was to evaluate N2O emission across different size soil aggregates of 6-year straw-incorporated soil as affected by exogenous N and OC treatments. Materials and methods In the present study, the N2O emission from different particle size soil aggregates (> 2, 1-2, 0.25-1, and < 0.25 mm) were investigated with/without 6-year maize straw incorporation under protected vegetable production. Ammonium sulfate (100 mg N kg(-1)) or ammonium sulfate (100 mg N kg(-1)) + glucose (100 mg C kg(-1)) were applied to these soil aggregates along with an unamended treatment (Control, CK) and incubated in a robotized continuous on-line incubation system for 200 h at 20celcius and 25% gravimetric water content. The dynamics of N2O emission was conducted in closed bottles with 21% initial oxygen concentration. Results and discussion The results showed that the proportion of > 1 mm aggregates and < 1 mm aggregates in straw-incorporated soil were increased 10.2% and decreased 29.1%, respectively, than those in no straw-incorporated soil. For all investigated treatments, < 0.25 mm aggregates had the highest cumulative N2O emission with 2.15-45.1 nmol N g(-1) across all aggregate sizes. Cumulative N2O emission in < 0.25 mm aggregate of straw-incorporated soil was greater than that in no straw-incorporated soil without exogenous N and OC addition. N addition stimulated N2O emission from all size aggregates, and the N-stimulating effects were enhanced by the simultaneous addition of glucose. With exogenous N, N, and OC additions, cumulative N2O emission in > 2 mm, 1-2 mm, and 0.25-1 mm aggregates of straw-incorporated soil was greater than that in no straw-incorporated soil. Conclusions These results suggested that the characteristic of N2O emissions across different size aggregates from straw-incorporated soil is altered with supplemental N and OC. The study highlights that the N2O emission from straw-incorporated soil was stimulated by exogenous organic carbon and nitrogen addition within > 0.25 mm aggregate.

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