Interpreting the temperature-induced response of ammonia oxidizing microorganisms in soil using nitrogen isotope fractionation |
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| Authors: | Seok-In Yun Hee-Myong Ro Woo-Jung Choi Gwang-Hyun Han |
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| Affiliation: | (1) Department of Agricultural Biotechnology, Seoul National University, Seoul, 151–921, South Korea;(2) Department of Agricultural Biotechnology and Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul, 151–921, South Korea;(3) Department of Rural and Biosystems Engineering, Chonnam National University, Gwangju, 500–757, South Korea;(4) Department of Environmental and Biological Chemistry, Chungbuk National University, Cheongju, 361–763, South Korea; |
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| Abstract: | Purpose Although nitrification plays a key role in the fate of soil nitrogen (N) under global warming, little information is available for the nitrifiers’ response to changing temperatures. Nitrogen isotope fractionation associated with nitrification can be a proxy of nitrifiers’ sensitivity to changing temperature. We hypothesized that the temperature-induced balance between the transport of substrate NH4+ into the microbial cell (supply) and the intracellular NH4+ oxidation (consumption) governs the intracellular NH4+ concentration and then affects nitrification rates and associated isotope fractionations. This study was conducted to understand the microbial response of NH4+ oxidation to changing temperatures by examining the effect of changing temperature on nitrification rate and apparent isotope fractionation. |
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