Microbial nitrification, denitrification and respiration in the leached cinnamon soil of the upper basin of Miyun Reservoir.
Leached cinnamon soil is the main agricultural soil distributed in the North China Plain. In this research, leached cinnamon soil samples were collected in the upper basin of Miyun Reservoir (northeast of Beijing, China). The BaPS method (Barometric Process Separation) was applied to measure nitrification, denitrification and respiration rates. The rates of nitrification, denitrification and respiration were 0-120.35 μg N/kg SDW h, 0-246.86 μg N/kg SDW h and 0.17-225.85 μg C/kg SDW h (Soil Dry Weight, SDW), respectively. The emission rates of CO2and NxOythrough nitrification, denitrification and respiration were 1.00-547.80 and 6.00-4850.65 μmol/h, respectively. The analysis of relationships between nitrification, denitrification and respiration rates indicated that these three microbial processes were interacted, which posed impacts on soil nitrogen availability. As indicated by the results, C:N ratio coupled with content could be taken as the indicators of content, which is usually the predominant form of N available to plants growing in soil. Results showed that content was the highest (i.e., >62.4 mg/kg) when C:N ratio was 5.30-8.40, meanwhile content was 3.71-4.39 mg/kg. Nevertheless, content was the lowest (i.e., <6.40 mg/kg) when C:N ratio was 9.2-12.10, meanwhile content was 3.41-4.35 mg/kg.
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China.
Wen
W
Xu
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China.|Beijing Engineering Research Center for Watershed Environmental Restoration &Integrated Ecological Regulation, School of Environment, Beijing Normal University, Beijing, 100875, China.|Institute for Energy, Environment, and Sustainable Communities, University of Regina, Research Drive, Beijing 100083, China.
Yan-Peng
YP
Cai
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China.|Beijing Engineering Research Center for Watershed Environmental Restoration &Integrated Ecological Regulation, School of Environment, Beijing Normal University, Beijing, 100875, China.
Zhi-Feng
ZF
Yang
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China.|Beijing Engineering Research Center for Watershed Environmental Restoration &Integrated Ecological Regulation, School of Environment, Beijing Normal University, Beijing, 100875, China.
Xin-An
XA
Yin
Institute for Energy, Environment, and Sustainable Communities, University of Regina, Research Drive, Beijing 100083, China.|School of Water Resources &Civil Engineering, China Agriculture University, Beijing 100083, China.
Qian
Q
Tan