caa a22 4500 60621805X CHVBK 20210128101110.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s11104-014-2343-y doi (NATIONALLICENCE)springer-10.1007/s11104-014-2343-y Mechanistic insights into the effects of N fertilizer application on N2O-emission pathways in acidic soil of a tea plantation [Elektronische Daten] [Yi Cheng, Jing Wang, Jin-Bo Zhang, Christoph Müller, Shen-Qiang Wang] Background and aims: Long-term nitrogen (N) fertilization has been shown to stimulate N2O emissions from acidic soil in tea plantations. However, the potential mechanism behind this stimulation remains unclear. We aimed to investigate the effects of 6years of fertilizer application on N2O emission pathways and the N2O emission ratio from heterotrophic and autotrophic nitrification in tea plantation. Methods: We performed a 15N-tracing experiment under 40 and 60% water-holding capacity (WHC) to investigate the effects of 6years of fertilizer application on N2O-emission pathways and emission ratios from heterotrophic and autotrophic nitrification in soil from tea plantations. Results: Six years of fertilizer application stimulated both heterotrophic and autotrophic nitrification, particularly under conditions of higher soil moisture. Autotrophic nitrification was the predominant pathway for N2O emission in tea soils, being responsible for 66.7-75.9% and 50.4-56.9% of N2O emission in unfertilized and fertilized soils, respectively. Fertilizer application significantly increased the contribution of denitrification to N2O emission (10.5-35.7%), independent of soil moisture conditions, which could be due to a fertilizer-induced reduction in soil pH Fertilizer application and a subsequent reduction in pH resulted in a 3-4 and 8-9 fold increase in the ratio of N2O emissions from heterotrophic nitrification and autotrophic nitrification, respectively. Conclusions: The increase in N2O emission following N fertilizer application was attributed to increased heterotrophic and autotrophic nitrification rates and an increased ratio of N2O emission from heterotrophic and autotrophic nitrification. Our results suggest that pH was a critical factor regulating the ratio of N2O emission from heterotrophic and autotrophic nitrification and thus controlling N2O emission from the tea soils studied. Springer International Publishing Switzerland, 2014 pH nationallicence Nitrification nationallicence Denitrification nationallicence 15N tracing model nationallicence Cheng Yi State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008, Nanjing, China aut Wang Jing School of Geography Science, Nanjing Normal University, 210023, Nanjing, China aut Zhang Jin-Bo School of Geography Science, Nanjing Normal University, 210023, Nanjing, China aut Müller Christoph Department of Plant Ecology, Justus-Liebig University Giessen, Heinrich-Buff-Ring 26, 35392, Giessen, Germany aut Wang Shen-Qiang State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008, Nanjing, China aut Plant and Soil Springer International Publishing 389/1-2(2015-04-01), 45-57 0032-079X 389:1-2<45 2015 389 11104 https://doi.org/10.1007/s11104-014-2343-y text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-014-2343-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cheng Yi State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008, Nanjing, China aut NATIONALLICENCE 700 1- Wang Jing School of Geography Science, Nanjing Normal University, 210023, Nanjing, China aut NATIONALLICENCE 700 1- Zhang Jin-Bo School of Geography Science, Nanjing Normal University, 210023, Nanjing, China aut NATIONALLICENCE 700 1- Müller Christoph Department of Plant Ecology, Justus-Liebig University Giessen, Heinrich-Buff-Ring 26, 35392, Giessen, Germany aut NATIONALLICENCE 700 1- Wang Shen-Qiang State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 210008, Nanjing, China aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 389/1-2(2015-04-01), 45-57 0032-079X 389:1-2<45 2015 389 11104