干旱区生态环境知识资源中心(Arid): Diurnal and spatial variations of soil NO

Arid

	Diurnal and spatial variations of soil NO_x fluxes in the northern steppe of China
	Wang Bing; Lee Xinqing; Theng Benny K G; Cheng Jianzhong; Yang Fang
来源期刊	Journal of Environmental Sciences
ISSN	1001-0742
出版年	2015
卷号	32 页码:54-61
英文摘要	NO_x emissions from biogenic sources in soils play a significant role in the gaseous loss of soil nitrogen and consequent changes in tropospheric chemistry. In order to investigate the characteristics of NO_x fluxes and factors influencing these fluxes in degraded sandy grasslands in northern China, diurnal and spatial variations of NO_x fluxes were measured in situ. A dynamic flux chamber method was used at eight sites with various vegetation coverages and soil types in the northern steppe of China in the summer season of 2010. Fluxes of NO_x from soils with plant covers were generally higher than those in the corresponding bare vegetation-free soils, indicating that the canopy plays an important role in the exchange of NO_x between soil and air. The fluxes of NO_x increased in the daytime, and decreased during the nighttime, with peak emissions occurring between 12:00 and 14:00. The results of multiple linear regression analysis indicated that the diurnal variation of NO_x fluxes was positively correlated with soil temperature (P < 0.05) and negatively with soil moisture content (P < 0.05). Based on measurement over a season, the overall variation in NO_x flux was lower than that of soil nitrogen contents, suggesting that the gaseous loss of N fromthe grasslands of northern China was not a significant contributor to the high C/N in the northern steppe of China. The concentration of NO_x emitted from soils in the region did not exceed the 1-hr National Ambient Air Quality Standard (0.25 mg/m~3).
英文关键词	Desertification N cycle Land-use change Nitrogen oxides
类型	Article
语种	英语
收录类别	CSCD
WOS研究方向	Agriculture
CSCD记录号	CSCD:5445708
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/335509
作者单位	Wang Bing, Chinese Academy of Sciences, Institute of Geochemistry, State Key Laboratory of Environmental Geochemistry, Guiyang, Guizhou 550002, China.; Cheng Jianzhong, Chinese Academy of Sciences, Institute of Geochemistry, State Key Laboratory of Environmental Geochemistry, Guiyang, Guizhou 550002, China.; Yang Fang, Chinese Academy of Sciences, Institute of Geochemistry, State Key Laboratory of Environmental Geochemistry, Guiyang, Guizhou 550002, China.; Lee Xinqing, Chinese Academy of Sciences,Institute of Geochemistry, State Key Laboratory of Environmental Geochemistry, Guiyang, Guizhou 550002, China.; Theng Benny K G, Landcare Research, Private Bag 11052, Palmerston North, 4442, New Zealand.
推荐引用方式 GB/T 7714	Wang Bing,Lee Xinqing,Theng Benny K G,et al. Diurnal and spatial variations of soil NO_x fluxes in the northern steppe of China[J],2015,32:54-61.
APA	Wang Bing,Lee Xinqing,Theng Benny K G,Cheng Jianzhong,&Yang Fang.(2015).Diurnal and spatial variations of soil NO_x fluxes in the northern steppe of China.Journal of Environmental Sciences,32,54-61.
MLA	Wang Bing,et al."Diurnal and spatial variations of soil NO_x fluxes in the northern steppe of China".Journal of Environmental Sciences 32(2015):54-61.