Surface-exchange of NOx and NH3 above a winter wheat field in the Yangtze Delta, China |
| |
Authors: | FANG Shuan-gxi ZHANG Yi MU Yu-jing |
| |
Affiliation: | Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China |
| |
Abstract: | A four-dynamic-chamber system was constructed to measure NOx and NH3 surface-exchange between a typical wheat field and the atmosphere in the Yangtze Delta, China. The average fluxes ofNO, NO2 and NH3 were 79, -5.6 and -5.1 ngN/(m2 x s), and 91, -1.8 and 23 ngN/(m2 x s), respectively for the wheat field and the bare soil. The NO flux was positively correlated with soil temperature and the fluxes of NO2 and NH3 were negatively correlated with their ambient concentrations during the investigated period. The compensation point of NO2 between the wheat field and the atmosphere was 11.9 microg/m3. The emissions of NO-N and NH3-N from the urea applied to the wheat field were 2.3% and 0.2%, respectively, which indicated that the main pathway of N loss from the investigated winter wheat field was NO. Application of a mixture of urea and lignin increased the emissions of NO, but also greatly increased the yield of the winter wheat. |
| |
Keywords: | NOx NH3 flux surface-exchange |
本文献已被 CNKI 万方数据 PubMed 等数据库收录! |
| 点击此处可从《环境科学学报(英文版)》浏览原始摘要信息 |
|
点击此处可从《环境科学学报(英文版)》下载全文 |
|