Diurnal and spatial variations of soil NOx fluxes in the northern steppe of China

	Diurnal and spatial variations of soil NOx fluxes in the northern steppe of China
	Bing Wang; Xinqing Lee; Benny K.G. Theng; Jianzhong Cheng; Fang Yang
通讯作者	Xinqing Lee
	2015
发表期刊	Journal of Environmental Sciences
卷号	32 期号:1 页码:54-61
摘要	NOx 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 NOx fluxes and factors influencing these fluxes in degraded sandy grasslands in northern China, diurnal and spatial variations of NOx 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 NOx 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 NOx between soil and air. The fluxes of NOx 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 NOx 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 NOx flux was lower than that of soil nitrogen contents, suggesting that the gaseous loss of N from the grasslands of northern China was not a significant contributor to the high C/N in the northern steppe of China. The concentration of NOx emitted from soils in the region did not exceed the 1-hr National Ambient Air Quality Standard (0.25 mg/m(3)). (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences.
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/6035
专题	环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
通讯作者	Xinqing Lee
推荐引用方式 GB/T 7714	Bing Wang,Xinqing Lee,Benny K.G. Theng,et al. Diurnal and spatial variations of soil NOx fluxes in the northern steppe of China[J]. Journal of Environmental Sciences,2015,32(1):54-61.
APA	Bing Wang,Xinqing Lee,Benny K.G. Theng,Jianzhong Cheng,&Fang Yang.(2015).Diurnal and spatial variations of soil NOx fluxes in the northern steppe of China.Journal of Environmental Sciences,32(1),54-61.
MLA	Bing Wang,et al."Diurnal and spatial variations of soil NOx fluxes in the northern steppe of China".Journal of Environmental Sciences 32.1(2015):54-61.

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