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- W2380821767 abstract "Knowledge on nitrous oxide(N2O) emissions from agricultural soils in semiarid regions is required for better understanding global terrestrial N2O losses.Nitrous oxide fluxes from winter wheat fields in the semi-arid Loess Plateau of China were monitored using static chambers from 1 July 2007 to 30 June 2009 at biweekly intervals.After nitrogen fertilizer application,tillage,summer rainfall and during freezing and thawing cycles,additional measurements were conducted.There were two treatments,with or without winter wheat growing(referred to as WFin and WFex,respectively).The results showed that there was no significant difference between two years for both treatments(P0.05).The annual average N2O emissions from WFin and WFex were 2.05 kg·N2O·hm-2·a-1 and 2.28 kg·N2O·hm-2·a-1,respectively.The average emission factor for WFin and WFex were 0.946% and 1.05%,respectively(uncorrected for background emission).The emission factor for WFin was about one third(32.2%) lower than the default value provided by the Intergovernmental Panel on Climate Change for the application of synthetic fertilizers to cropland(1.25%).Therefore,the amount of N2O emissions from the semiarid wheat field may be overestimated without using regional-specific factor.Seasonal variations in N2O emissions were mainly affected by the short-time events including freeze and thaw cycles,nitrogen fertilizer application,tillage and summer rainfall.The greatest N2O fluxes of WFex occurred during the freeze and thaw cycles of 2008(February 29) with the value of 179.58 g·N2O·m-2·h-1.In comparison,the peak values of N2O emission from WFin occurred after tillage,fertilization and during continuous rainfall at the beginning of October,2007,with the value of 93.4 g·N2O·m-2·h-1.There was significant correlation between N2O fluxes from the WFin and soil temperature(P0.01),ambient air temperature(P0.01) and water field pore space(WFPS)(P0.05).The results of stepwise multiple linear regression showed that soil temperature and WFPS could be identified as the key factors determining the temporal variability of N2O fluxes from the WFin and accounted for 16.9% of the temporal variation.However,for the WFex treatment,N2O fluxes were not correlated with any of these environmental and soil factors.Soil WFPS in the WFin and the WFex was always below 60% except for during freeze-thaw in 2008and immediately after heavy rainfall,suggesting that nitrification was the important source of N2O in this region." @default.
- W2380821767 created "2016-06-24" @default.
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- W2380821767 date "2011-01-01" @default.
- W2380821767 modified "2023-09-28" @default.
- W2380821767 title "Nitrous oxide emissions from winter wheat field in the Loess Plateau" @default.
- W2380821767 hasPublicationYear "2011" @default.
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