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Fertilizer nitrogen loss via n_2 emission from calcareous soil following basal urea application of winter wheat

Atmospheric and Oceanic Science Letters 2019年第2期12卷 91-97页

作者： ZHAnG Yukun WAnG Rui PAn Zhanlei LIU Yan ZHEnG Xunhua JU Xiaotang ZHAnG Chong BUTTERBACH-BAHL Klaus HUAnG Binxiang State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences College of Earth and Planetary Sciences University of Chinese Academy of Sciences College of Resources and Environmental Sciences China Agricultural University Institute for Meteorology Climate and Atmospheric Environmental Research Karlsruhe Institute of Technology

The ratio of nitrous oxide(n2O)to n2O plus nitrogen gas(n2)emitted from soils(n2O/(n2O+n2))is regarded as a key parameter for estimating fertilizer nitrogen(n)loss via n2emission at local,regional or global ***,reliable measurement of soil n2emissions is still difficult in fertilized soil-crop *** this study,the n loss via n2emission following basal urea application(with a dose of 150 kg n ha-1)to a calcareous soil cultivated with winter wheat was quantified using the helium-based gas-flow-soil-core *** of n2and n2O from sampled fresh soils were measured under simulated field soil temperature and oxygen *** observation performed on the first day after irrigation and rainfall events showed the highest n2and n2O emissions,which amounted to approximately 11.8 and 3.8μg n h-1kg-1dry soil,corresponding to 3304 and 1064μg n m-2h-1,*** n2O/(n2O+n2)molar ratios within about 10 days following fertilization ranged from 0.07 to 0.25,which were much larger than those at the other *** the one-month experimental period,the urea-n loss via emissions of n2,n2O,and n2+n2O was 1.6%,0.6%,and 2.2%,*** study confirms that the widely applied acetylene-inhibition method substantially underestimates fertilizer n losses via n2emissions from calcareous soils cultivated with winter wheat.

关键词： Denitrification fertilizer nitrogen loss n2emission n2O/(n2O+n2) calcareous soil

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