Use of Nitrogen Isotope To Determine Fertilizer- and Soil-Derived Ammonia Volatilization in a Rice/Wheat Rotation System

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• 作者：Xu Zhao ; Xiaoyuan Yan ; Yingxin Xie ; Shenqiang Wang ; Guangxi Xing ; Zhaoliang Zhu
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2016
• 出版时间：April 20, 2016
• 年：2016
• 卷：64
• 期：15
• 页码：3017-3024
• 全文大小：432K
• 年卷期：0
• ISSN：1520-5118

文摘

The nitrogen (N) isotope method reveals that application of fertilizer N can increase crop uptake or denitrification and leaching losses of native soil N via the “added N interaction”. However, there is currently little evidence of the impact of added N on soil N losses through NH₃ volatilization using ¹⁵N methodologies. In the present study, a three-year rice/wheat rotated experiment with 30% ¹⁵N-labeled urea applied in the first rice season and unlabeled urea added in the following five crop seasons was performed to investigate volatilization of NH₃ from fertilizer and soil N. We found 9.28% of NH₃ loss from ¹⁵N urea and 2.88–7.70% declines in ¹⁵N-NH₃ abundance occurred during the first rice season, whereas 0.11% of NH₃ loss from ¹⁵N urea and 0.02–0.21% enrichments in ¹⁵N-NH₃ abundance happened in the subsequent seasons. The contributions of fertilizer- and soil-derived N to NH₃ volatilization from a rice/wheat rotation were 75.8–88.4 and 11.6–24.2%, respectively. These distinct variations in ¹⁵N-NH₃ and substantial soil-derived NH₃ suggest that added N clearly interacts with the soil source contributing to NH₃ volatilization.