The authors proposed a quasidynamic chamber method for measurement of NH3 emission from a soilplant system. This method showed that the recovery rate is 89.0％± 4.9% for measurement of NH3 volatilization, which is in agreement with the recovery rate of a windtunnel method. It can also yield results consistent with those measured by a limitedly ventilated close chamber method. There is a significant exponential correlation between diurnal NH3 emissions and temperature (r<0.05). The optimum time for an intermittent measurement using the quasidynamic chamber method was proposed at around 0900LST or 1600LST. The NH3emission caused by an N fertilization event could be best captured after 1－2 weeks using the quasidynamic chamber method. Using the quasidynamic chamber method, the NH3N losses from the applied urea into a wheat field in Shanxi Province during the wheat jointing stage were observed at 3％－5%.
童华君,郑循华,王睿,周再兴,岳进,刘春岩,李明,梁旺国,董海波.2009.准动态箱法测定农田NH3挥发初探[J].气候与环境研究,14(4):373-382. Tong Huajun, Zheng Xunhua, Wang Rui, Zhou Zaixing, Yue Jin, Liu Chunyan, Li Ming, Liang Wangguo, Dong Haibo.2009.[J]. Climatic and Environmental Research (in Chinese],14(4):373-382.Copy