Details

Autor(en) / Beteiligte

• Trost, Benjamin
• Prochnow, Annette
• Drastig, Katrin
• Meyer-Aurich, Andreas
• Ellmer, Frank
• Baumecker, Michael

Titel

Irrigation, soil organic carbon and N₂O emissions. A review

Ist Teil von

• Agronomy for sustainable development, 2013-10, Vol.33 (4), p.733-749

Ort / Verlag

Paris: Springer-Verlag

Erscheinungsjahr

2013

Link zum Volltext

Quelle

SpringerLink (Online service)

Beschreibungen/Notizen

• Irrigation has a critical role for crop production worldwide. In particular, irrigation is a major issue due to the growing food demand and climate change. Irrigation affects yields and the emission of greenhouse gases such as CO₂ and N₂O by soils. Here, we review the effect of irrigation on soil organic carbon and N₂O emissions. We analysed 22 investigations in various regions of the world. Interactions between irrigation, soil and management factors are described. The main points are: (1) The influence of irrigation is strongly dependent on climate and initial soil organic carbon content. For instance, irrigation of cultivated desert soils led to an average increase of 90 % to over 500 % of soil organic carbon. (2) Irrigation of semiarid regions increases soil organic carbon by 11 % to 35 %. (3) No consistent effects of irrigation were observed in humid regions. In many cases, N₂O emissions increase after precipitation or irrigation. (4) Comparison of N₂O emissions from irrigated and non-irrigated fields shows that availability of reactive nitrogen compounds controls increased N₂O emissions under irrigation, in most cases. Here, increases of about 50 % to 140 % in N₂O emissions were reported.