| 基于区域氮循环模型IAP-N的安徽省农用地N2O排放量估算 |
| 摘要点击 1727 全文点击 883 投稿时间：2014-11-13 修订日期：2015-03-13 |
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| 中文关键词 IAP-N模型 农用地 N2O排放量 N2O直接排放 N2O间接排放 |
| 英文关键词 IAP-N model agricultural land N2O emissions direct N2O emissions indirect N2O emissions |
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| 中文摘要 |
| 本研究采用区域氮循环模型IAP-N估算了2011年安徽省县级共计7种农用地类型的N2O排放,估算所需的统计数据来源于安徽省各市统计年鉴,排放因子来源于已发表文献中的观测数据. 结果表明,2011年安徽省农用地N2O总排放量(以N2O-N计)为3.51万t. 其中,直接排放2.76万t,间接排放0.66万t,田间秸秆燃烧排放0.08万t. 淮北平原(Ⅰ区)和沿江圩丘(Ⅱ区)是安徽农用地N2O主要排放区,对农用地N2O总排放的贡献分别为41%和35%. 单纯旱作农田是各区最主要的直接排放源,约占直接排放的74%. Ⅱ区和Ⅲ区水旱轮作中的旱作地N2O排放居第二位(分别占Ⅱ区和Ⅲ区直接排放的19%和14%),Ⅳ区的果园茶园N2O直接排放居第二位(占Ⅳ区直接排放的22%). 间接排放源中由大气氮沉降引起的N2O排放占三分之二. 该研究结果可为决策者合理利用肥料,制定安徽省农业土壤温室气体减排措施提供科学依据. |
| 英文摘要 |
| N2O emissions from seven categories of Anhui croplands in 2011 were estimated by using a regional nitrogen cycling model IAP-N. The required statistical data were from each city's statistical yearbook in Anhui Province. The emission factors were from the published field data. The results showed that total N2O emissions from Anhui croplands in 2011 were 35.1 thousand ton, in which direct and indirect N2O emissions were, respectively, 27.6 thousand ton and 6.6 thousand ton, and N2O emission from residues/straws burning in the field was 800 ton. Huaibei Plain (Region Ⅰ) and Jianghuai Hilly (Region Ⅱ) were the main contribution regions in Anhui, accounting for 41% and 35% of its regional total N2O emissions, respectively. The most important source for direct N2O emission is the year round upland fields with 74% contribution of the province total direct N2O emission. The second important source in Region Ⅱ and Region Ⅲ is upland cropping season of the rotation fields with rice and upland-crops, accounting for 19% and 14%, respectively. While in Region Ⅳ, the second direct N2O emission sources are tea gardens and orchards, accounting for 22%. About two-thirds of the indirect N2O were from atmospheric nitrogen deposition. The results can provide a scientific basis for policy makers to make agricultural soils GHG mitigation measures in Anhui Province, such as reasonable use of fertilizers. |
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