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	Gaseous nitrogen losses from urea applied to maize on a calcareous fluvo-aquic soil in the North China Plain
	Cai, G; Chen, D; White, RE; Fan, XH; Pacholski, A; Zhu, ZL; Ding, H
刊名	AUSTRALIAN JOURNAL OF SOIL RESEARCH
	2002
卷号	40期号:5页码:737-748
关键词	denitrification maize NH3 volatilisation N2O emission
ISSN号	0004-9573
DOI	10.1071/SR01011
通讯作者	Cai, G()
英文摘要	Gaseous nitrogen losses, by NH3 volatilisation and derntrification, are mainly responsible for the low recovery of N fertiliser applied to irrigated maize on the North China Plain. Two field experiments were conducted to measure NH3 volatilisation and nitrification-denitrification losses from urea applied to maize (Zea mays L.) grown on a calcareous fluvo-aquic soil (Aquic Inceptisol) in Fengqiu County, Henan Province. The first was carried out in June 1998 (urea applied at 75 kg N/ha 3 weeks after sowing), and the second in July 1998 (urea applied at 200 kg N/ha 6 weeks after sowing). Each experiment included 3 treatments-control, surface-broadcast (SB), and deep point placement (DP) or broadcast followed by irrigation (BI). NH3 loss was measured by a micrometeorological method (NH3 sampler). Denitrification (N-2+N2O) was measured by the acetylene inhibition-intact soil core technique, and N2O emission was also measured in the absence of acetylene. The recovery of applied N was measured by a N-15 balance technique. When urea was surface broadcast (SB) 3 weeks (75 kg N/ha) and 6 weeks (200 kg N/ha) after sowing, 44 and 48% of the applied N was lost by NH3 volatilisation, respectively. The corresponding losses from the BI and DP treatments were only 18% and 11%, respectively. Denitrification was a significant process in this well-drained sandy soil, with average loss rates of 0.26-0.43 kg N/ha.day in the controls (from resident soil N), compared with 0.52-0.63 kg N/ha.day in the surface fertiliser treatments. Deep placement of urea reduced the denitrification rate to an average of 0.3 kg N/ha.day. The net denitrification loss from the fertiliser was <2% of the applied N, except for the SB urea treatment in the second experiment. The application of N fertiliser as urea increased N2O emissions from e. 0.3 to c. 2.3 kg N/ha over 57 days in the second experiment, with average N2O emission rates in the control and SB treatment of 0.006 and 0.042 kg N/ha.day, respectively. The significantly lower ratio of N-2/N2O in the urea treatments compared with the control suggested that nitrification of applied N may have contributed to N2O production. Alternatively, the ratio of N-2/N2O during denitrification may have changed with the greater supply of NO3-.
收录类别	SCI
WOS关键词	FIELD MEASUREMENT ; DENITRIFICATION ; OXIDE ; NITRIFICATION ; DINITROGEN ; EMISSION ; AMMONIA
WOS研究方向	Agriculture
WOS类目	Soil Science
语种	英语
出版者	C S I R O PUBLISHING
WOS记录号	WOS:000177524300003
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2559197
专题	南京土壤研究所
通讯作者	Cai, G
作者单位	1.Chinese Acad Sci, Inst Soil Sci, Nanjing 210008, Peoples R China 2.Univ Melbourne, Sch Resource Management, Melbourne, Vic 3010, Australia 3.Tech Univ Carolo Wilhelmina Braunschweig, Inst Geoecol, D-38106 Braunschweig, Germany
推荐引用方式 GB/T 7714	Cai, G,Chen, D,White, RE,et al. Gaseous nitrogen losses from urea applied to maize on a calcareous fluvo-aquic soil in the North China Plain[J]. AUSTRALIAN JOURNAL OF SOIL RESEARCH,2002,40(5):737-748.
APA	Cai, G.,Chen, D.,White, RE.,Fan, XH.,Pacholski, A.,...&Ding, H.(2002).Gaseous nitrogen losses from urea applied to maize on a calcareous fluvo-aquic soil in the North China Plain.AUSTRALIAN JOURNAL OF SOIL RESEARCH,40(5),737-748.
MLA	Cai, G,et al."Gaseous nitrogen losses from urea applied to maize on a calcareous fluvo-aquic soil in the North China Plain".AUSTRALIAN JOURNAL OF SOIL RESEARCH 40.5(2002):737-748.

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