| Effects of nitrogen types on N2O emissions of dry-land soil |
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| DOI：10.7606/j.issn.1000-7601.2007.01.14 |
| Key Words: N2O flux NO-3-N NH+4-N water hold capacity(WHC) nitrification denitrification |
| Author Name | Affiliation | | LI ANG Dong-li | College of resources and environment NWUAF, Shaanxi,Yangling 712100 | | FANG Ri-yao | College of resources and environment NWUAF, Shaanxi,Yangling 712100 | | LI Sheng-xiu | College of resources and environment NWUAF, Shaanxi,Yangling 712100 | | Ove Emteryd | Department of forestry ecology Sweden Agriculture University, Sweden, Umea 90183 | | ZHANG Xin-chang | College of resources and environment NWUAF, Shaanxi,Yangling 712100 |
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| Abstract: |
| Based on field experiment the effects of nitrogen fertilizer types on N2O emissions and influential factors were studied under two different soil water conditions on the loess soil.The results showed that at both 90% WHC and 70% WHC water content,the average N2O emissions on ammonium treated plots were 233.6±165.4 μg/(m2·h) and 166.4± 153.3 μg/(m2·h),whereas those on the nitrate treated plots were 75±40.2 μg/(m2·h) and 49.27±17.0 μg/(m2·h), respectively.In the short period of fertilization,N2O fluxes from the ammonium plots were higher than that form the nitrate plots.Therefore,the main N2O sources on the surface of loess soil were from nitrification.Under the natural mineralization,N2O flux was about 17.0 μg/(m2·h) on the tested soil.Soil water status had little influence on the N2O fluxes from ammonium plot,while it had a large effect on the nitrate plots under the experimental condition.Meanwhile,soil temperature,pH,soil water content had certain influences on N2O emissions. |
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