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	The contribution of nitrogen transformation processes to total N2O emissions from soils used for intensive vegetable cultivation
	Zhu, Tongbin; Zhang, Jinbo; Cai, Zucong
刊名	PLANT AND SOIL
	2011-06-01
卷号	343期号:1-2页码:313-327
关键词	Autotrophic nitrification Heterotrophic nitrification N-15 N2O product ratio Soil pH Vegetable field
ISSN号	0032-079X
DOI	10.1007/s11104-011-0720-3
通讯作者	Cai, Zucong(zccai@mail.issas.ac.cn)
英文摘要	The rapid expansion of intensively farmed vegetable fields has substantially contributed to the total N2O emissions from croplands in China. However, to date, the mechanisms underlying this phenomenon have not been completely understood. To quantify the contributions of autotrophic nitrification, heterotrophic nitrification, and denitrification to N2O production from the intensive vegetable fields and to identify the affecting factors, a N-15 tracing experiment was conducted using five soil samples collected from adjacent fields used for rice-wheat rotation system (WF), or for consecutive vegetable cultivation (VF) for 0.5 (VF1), 6 (VF2), 8 (VF3), and 10 (VF4) years. Soil was incubated under 50% water holding capacity (WHC) at 25A degrees C for 96 h after being labeled with (NH4NO3)-N-15 or NH (4) (15) NO3. The average N2O emission rate was 24.2 ng N kg(-1) h(-1) in WF soil, but it ranged from 69.6 to 507 ng N kg(-1) h(-1) in VF soils. Autotrophic nitrification, heterotrophic nitrification and denitrification accounted for 0.3-31.4%, 25.4-54.4% and 22.5-57.7% of the N2O emissions, respectively. When vegetable soils were moderately acidified (pH, 6.2 to a parts per thousand yenaEuro parts per thousand 5.7), the increased N2O emissions resulted from the increase of both the gross autotrophic and heterotrophic nitrification rates and the N2O product ratio of autotrophic nitrification. However, once severe acidification occurred (as in VF4, pH a parts per thousand currency signaEuro parts per thousand 4.3) and salt stress increased, both autotrophic and heterotrophic nitrification rates were inhibited to levels similar to those of WF soil. The enhanced N2O product ratios of heterotrophic nitrification (4.84aEuro degrees), autotrophic nitrification (0.93aEuro degrees) and denitrification processes were the most important factors explaining high N2O emission in VF4 soil. Data from this study showed that various soil conditions (e.g., soil salinity and concentration of NO (3) (-) or NH (4) (+) ) could also significantly affect the sources and rates of N2O emission.
收录类别	SCI
WOS关键词	LONG-TERM APPLICATION ; SANDY LOAM SOIL ; OXIDE PRODUCTION ; AEROBIC DENITRIFICATION ; ALCALIGENES-FAECALIS ; CONIFEROUS FOREST ; CROPPING SYSTEMS ; NITRIFICATION ; PH ; CHINA
WOS研究方向	Agriculture ; Plant Sciences
WOS类目	Agronomy ; Plant Sciences ; Soil Science
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000290688000023
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2558868
专题	南京土壤研究所
通讯作者	Cai, Zucong
作者单位	Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Tongbin,Zhang, Jinbo,Cai, Zucong. The contribution of nitrogen transformation processes to total N2O emissions from soils used for intensive vegetable cultivation[J]. PLANT AND SOIL,2011,343(1-2):313-327.
APA	Zhu, Tongbin,Zhang, Jinbo,&Cai, Zucong.(2011).The contribution of nitrogen transformation processes to total N2O emissions from soils used for intensive vegetable cultivation.PLANT AND SOIL,343(1-2),313-327.
MLA	Zhu, Tongbin,et al."The contribution of nitrogen transformation processes to total N2O emissions from soils used for intensive vegetable cultivation".PLANT AND SOIL 343.1-2(2011):313-327.

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