https://scholars.lib.ntu.edu.tw/handle/123456789/316839
標題: | The effect of future climate perturbations on N2O emissions from a fertilized humid grassland | 作者: | Hsieh, Cheng-I Leahy, P. Kiely, G. Li, C. |
關鍵字: | Climate change; DNDC model; Emission factor; Nitrogen fertilizer; Nitrous oxide | 公開日期: | 2005 | 卷: | 73 | 期: | 1 | 起(迄)頁: | 15-23 | 來源出版物: | Nutrient Cycling in Agroecosystems | 摘要: | N2O emissions from a fertilized humid grassland near Cork, Ireland were continuously measured during 2003 using an eddy covariance system. For most of the year emissions were close to zero and 60% of the emissions occurred in eight major events of 2-20 days' duration. Two hundred and seven kg ha-1 of synthetic N and 130 kg ha-1 organic N were applied over the year and the total measured annual N2O emission was 11.6 kg N ha-1. The flux data were used to test the prediction of N 2O emissions by the DNDC (DeNitrification - DeComposition) model. The model predicted total emissions of 15.4 kg N ha-1, 32 % more than the observed emissions. On this basis the model was further used to simulate (a) background (non-anthropogenic) N2O emissions and (b) the effect on N2O emissions of future climate perturbations based on the Hadley Center model output of the IS92a scenario for Ireland. DNDC predicts 1.7 kg N ha-1 year-1 of background N2O emissions, accounting for 15% of the observed emissions. Climate shifts will increase total annual modeled N2O emissions from 15.4 kg N ha-1 to 22.4 kg N ha-1 if current levels of N applications are maintained, or to 21.2 kg N ha-1 if synthetic N applications are reduced to 170 kg N ha-1 to comply with recent EU water quality legislation. Thus the projected increase in N2O emissions due to climate change is far larger than the decrease expected from reduced fertilizer applications. © Springer 2005. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-27844492871&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/316839 |
DOI: | 10.1007/s10705-005-7129-4 | SDG/關鍵字: | climate change; grassland soil; nitrous oxide; Cork [County Cork]; County Cork; Eurasia; Europe; Ireland; Munster [Ireland]; Western Europe |
顯示於: | 生物環境系統工程學系 |
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