Effect of topography on nitrous oxide emissions from winter wheat fields in Central France |
| |
| Authors: | Gu Jiangxin Nicoullaud Bernard Rochette Philippe Pennock Daniel J Hénault Catherine Cellier Pierre Richard Guy |
| |
| Institution: | aINRA, UR 0272 Science du sol, Centre de recherche d’Orléans, CS 40001 Ardon, 45075 Orléans Cedex 2, France;bAgriculture and Agri-Food Canada, 2560 Hochelaga Blvd, Québec, QC G1V 2J3, Canada;cDepartment of Soil Science, University of Saskatchewan, 51 Campus Drive, Saskatoon, Saskatchewan S7N 5A8, Canada;dUMR Environnement et Grandes Cultures, INRA-AgroParisTech, 78850 Thiverval-Grignon, France |
| |
| Abstract: | We assessed nitrous oxide (N2O) emissions at shoulder and foot-slope positions along three sloping sites (1.6–2.1%) to identify the factors controlling the spatial variations in emissions. The three sites received same amounts of total nitrogen (N) input at 170 kg N ha−1. Results showed that landscape positions had a significant, but not consistent effect on N2O fluxes with larger emission in the foot-slope at only one of the three sites. The effect of soil inorganic N (NH4+ + NO3−) contents on N2O fluxes (r2 = 0.55, p < 0.001) was influenced by water-filled pore space (WFPS). Soil N2O fluxes were related to inorganic N at WFPS > 60% (r2 = 0.81, p < 0.001), and NH4+ contents at WFPS < 60% (r2 = 0.40, p < 0.01), respectively. Differences in WFPS between shoulder and foot-slope correlated linearly with differences in N2O fluxes (r2 = 0.45, p < 0.001). We conclude that spatial variations in N2O emission were regulated by the influence of hydrological processes on soil aeration intensity. |
| |
| Keywords: | Nitrous oxide Landscape position Fertilization Soil inorganic nitrogen Soil water content |
| 本文献已被 ScienceDirect PubMed 等数据库收录！ |
|
