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Soil gas fluxes of N_2O, CO_2 and CH4 under elevated carbon dioxide under wheat in northern China

文献类型: 会议论文

第一作者: Shu Kee Lam

作者: Shu Kee Lam 1 ; Rob Norton 1 ; Erda Lin 2 ; Roger Armstrong 3 ; Deli Chen 4 ;

作者机构: 1.Melbourne School of Land and Environment, The University of Melbourne, Victoria 3010, Australia

2.Ministry of Agriculture on Agro-environment and Climate Change

3.Agro-Environment and Sustainable Development Institute, Chinese Academy of Agricultural Sciences, Beijing, China

4.Department of Primary Industries, Private Bag 260, Horsham, Victoria 3401, Australia

关键词: Free air carbon dioxide enrichment;nitrous oxide;carbon dioxide;methane;nitrogen fertilizer;wheat soil

会议名称: World Congress of Soil Science

主办单位:

页码: 4520-4523

摘要: Fluxes of nitrous oxide (N_2O), carbon dioxide (CO_2) and methane (CH4) were measured from soils under ambient (420 ±18 mumol/mol) and elevated (565 ± 37 mumol/mol) [CO_2] at the Free-Air Carbon dioxide Enrichment (FACE) experiment in a wheat fieldin northern China. N_2O and CO_2 emissions under elevated CO_2 were increased by 47% (p < 0.05) and 11% (p = 0.063), respectively, but had no effect on CH4 flux. A significantly greater emission of N_2O (1812%) and CO_2 (69%) was observed from high-N (190 kg N/ha) than low-N (50 kg N/ha) plots only after simultaneous addition of water and urea. The fluxes of N_2O and CO_2 were positively and significantly correlated with both soil moisture and organic C contents, but CH_4 flux with organic C content only. There was no significant relationship between soil mineral N and gas fluxes.

分类号: S15-532

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