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Position: Home > Articles > Nitrogen Isotopic Fractionation Related to Nitrification Capacity in Agricultural Soils Pedosphere 2014,24 (2)

Nitrogen Isotopic Fractionation Related to Nitrification Capacity in Agricultural Soils

作  者：
Guangtao Song;Xu Zhao;Shenqiang Wang;Guangxi Xin
单  位：
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China);State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China;State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China);Changshu National Agro-Ecosystem Observation and Research Station, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China); University of Chinese Academy of Sciences, Beijing 100049 (China)
关键词：
nh;nitrification;rqu;fau;agricultural soils;yq
摘  要：
A laboratory-based aerobic incubation was conducted to investigate nitrogen (N) isotopic fractionation related to nitrification in five agricultural soils after application of ammonium sulfate ((NH4)SO4). The soil samples were collected from a subtropical barren land soil derived from granite (ROB), three subtropical upland soils derived from granite (RQU), Quaternary red earth (RGU), Quaternary Xiashu loess (YQU) and a temperate upland soil generated from alluvial deposit (FAU). The five soils varied in nitrification potential, being in the order of FAU > YQU > RGU > RQU > ROB. Significant N isotopic fractionation accompanied nitrification of Nut. delta N-15 values of NH4+ increased with enhanced nitrification over time in the four upland soils with NH4+ addition, while those of NO3- decreased consistently to the minimum and thereafter increased. delta N-15 values of NH4+ showed a significantly negative linear relationship with NH4+-N concentration, but a positive linear relationship with NO3--N concentration. The apparent isotopic fractionation factor calculated based on the loss of NH4+ was 1.036 for RQU, 1.022 for RGU, 1.016 for YQU, and 1.020 for FAU, respectively. Zero- and first-order reaction kinetics seemed to have their limitations in describing the nitrification process affected by NH4+ input in the studied soils. In contrast, N kinetic isotope fractionation was closely related to the nitrifying activity, and might serve as an alternative tool for estimating the nitrification capacity of agricultural soils.

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