Large losses of ammonium-nitrogen from a rice ecosystem under elevated CO2

Lei Cheng, Chenchao Xu, Kaihang Zhang, Wanying Zhu, Jing Xiao, Chen Zhu, Naifang Zhang, Fangjian Yu, Shuyao Li, Chunwu Zhu, Qichao Tu, Xin Chen, Jianguo Zhu, Shuijin Hu, Roger T Koide & Mary K Firestone
Inputs of nitrogen into terrestrial ecosystems, mainly via the use of ammonium-based fertilizers in agroecosystems, are enormous, but its fate under elevated atmospheric carbon dioxide (CO2) is not well understood. We have taken advantage of a 15-year free air CO2 enrichment study to investigate the influence of elevated CO2 on the transformation of ammonium-nitrogen in a rice ecosystem in which ammonium is usually assumed to be stable under anaerobic conditions. We demonstrate that elevated CO2...
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