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Effects of N Fertilizer Application on Soil N2O Emissions and CH4 Uptake: A Two-Year Study in an Apple Orchard in Eastern China

文献类型： 外文期刊

作者： Xie, Baohua 1 ; Gu, Jiangxin 2 ; Yu, Junbao 1 ; Han, Guangxuan 1 ; Zheng, Xunhua 4 ; Xu, Yu 5 ; Lin, Haitao 5 ;

作者机构： 1.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Shandong Prov Key Lab Coastal Environm Proc,CAS, Key Lab Coastal Zone Environm Proc & Ecol Remedia, Yantai 264003, Peoples R China

2.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Peoples R China

3.Ludong Univ, Coll Resources & Environm Engn, Yantai 264025, Peoples R China

4.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China

5.Shandong Acad Agr Sci, Agr Resources & Environm Inst, Jinan 250100, Shandong, Peoples R China

关键词： greenhouse gas;direct emission factor;background emissions;fertilization;production;upland orchard

期刊名称：ATMOSPHERE （ 影响因子：2.686； 五年影响因子：2.848 ）

ISSN： 2073-4433

年卷期： 2017 年 8 卷 10 期

页码：

收录情况： SCI

摘要： Land use changes from cropland to orchards in Eastern China have raised serious concerns about the regional nitrogen (N) cycle and greenhouse gas balance. We measured soil nitrous oxide (N2O) emissions and methane (CH4) uptake using manual static chambers in an apple orchard. The primary aims were to assess the effect of N fertilizer application on gas fluxes and quantify the site-specific N2O emission factor (EFd). Field experiments were arranged in a randomized block design with three N input rates (0, 800 and 2600/2000 kg N ha(-1) year(-1)). We found that orchard soils were a negligible CH4 sink (-1.1 to -0.4 kg C ha(-1) year(-1)). Annual N2O emissions responded positively to N input rates, ranging from 34.1 to 60.3 kg N ha(-1) year(-1). EFd ranged from 1.00% to 1.65% with a mean of 1.34%. The extremely large background emissions of N2O (34.1-34.3 kg N ha(-1) year(-1)) most likely originated from nitrate accumulation in the soil profile because of historical overuse of N fertilizer. We conclude that (1) site-specific EFd is suitable for assessing regional direct N2O emissions from upland orchards; and (2) conventional fertilization regimes must be avoided, and reduced N input rates are recommended in the study region.

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