Diurnal and spatial variations of soil NOx fluxes in the northern steppe of China
文献类型：期刊论文
| 作者 | Benny K.G. Theng; Bing Wang; Jianzhong Cheng; Xinqing Lee; Fang Yang |
| 刊名 | Journal of Environmental Sciences
 |
| 出版日期 | 2015 |
| 卷号 | 32期号:1页码:54-61 |
| 通讯作者 | Xinqing Lee |
| 英文摘要 | 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. |
| 学科主题 | 环境地球化学 |
| 语种 | 英语 |
| 公开日期 | 2017-05-17 |
| 源URL | [http://ir.gyig.ac.cn:8080/handle/352002/6035]  |
| 专题 | 地球化学研究所_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 | Benny K.G. Theng,Bing Wang,Jianzhong Cheng,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 | Benny K.G. Theng,Bing Wang,Jianzhong Cheng,Xinqing Lee,&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 | Benny K.G. Theng,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. |
入库方式： OAI收割
来源：地球化学研究所
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