Characteristics of N<sub>2</sub> and N<sub>2</sub>O Fluxes from a Cultivated Black Soil: A Case Study through In Situ Measurement Using the <sup>15</sup>N Gas Flux Method
Zhanlei Pan,
Rui Wang,
Yan Liu,
Lin Wang,
Xunhua Zheng,
Zhisheng Yao,
Hongbo He,
Xiaochen Zhang
Affiliations
Zhanlei Pan
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Rui Wang
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Yan Liu
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Lin Wang
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Xunhua Zheng
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Zhisheng Yao
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Hongbo He
Key Laboratory of Pollution Ecology and Environment Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
Xiaochen Zhang
Key Laboratory of Pollution Ecology and Environment Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China
The magnitudes and source partitioning of soil dinitrogen (N2) and nitrous oxide (N2O) emissions are not well documented, yet. To address both issues for black soil subject to a typical cool temperate climate, soil N2O and N2 fluxes following the basal application event of an ammonium-based fertilizer (labeled by 15N) for maize were simultaneously measured in situ by using the 15N gas flux (15NFG) method. During the two-month field experiment, the measured N2 and N2O fluxes cumulated to 1.61 ± 0.47 and 0.12 ± 0.01 kg N ha−1, respectively, showing N2O to N2O plus N2 ratios (RN2O) of 0.02–0.31 (0.15 on average). Temperature was identified as a key factor regulating the total soil N2 fluxes (r2 = 0.27, p 2 fluxes originated from nitrate denitrification related to dissolved organic carbon concentrations (r2 = 0.39, p 2O fluxes and the RN2O values, respectively (p 2O emissions. Our findings emphasized the importance of temperature in regulating N2 emissions from black soil and the possible site- and/or time specificity of a soil factors-based parametrization of RN2O. In addition, this study implicates that labeling a nitrogen substrate of nitrification while using the 15N enrichment of N2O is necessary to more accurately quantify total soil N2 fluxes in situ by using the 15NFG approach even though further confirmation in future studies is still needed.
