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| Regularity of net nitrogen transformation rates and greenhouse gas emissions in black soil of different textures |
| Received:September 20, 2019 |
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| KeyWord:loamy sand soil;silt loam soil;mineralization;nitrification;N2O;CO2 |
| Author Name | Affiliation | E-mail | | LANG Man | Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China
School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | | | LI Ping | Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China
School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | pli@nuist.edu.cn | | WEI Wei | School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China | |
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| Abstract: |
| To better understand the net nitrogen transformation rates and greenhouse gas emissions in black soils, a short-term(7 day)laboratory incubation experiment was conducted on two soils of different textures(loamy sand and silt loam)from the semi-arid region in Heilongjiang Province, China. The rates of net nitrification and net mineralization, N2O and CO2 emission rates, and cumulative emissions were determined. Our results showed that the average net mineralization rate and CO2 emission rate of loamy sand soil during the 7-day incubation period was 0.49 mg N·kg-1·d-1 and 0.30 mg CO2-C·kg-1·h-1, respectively, which was significantly lower than the rates for the silt loam soil(1.37 mg N·kg-1·d-1 and 0.47 mg CO2-C·kg-1·h-1, respectively). The average net nirification rate and N2O emission rate of loamy sand soil was 1.65 mg N·kg-1·d-1 and 212.6 ng N2O-N·kg-1·h-1, respectively, which was significantly lower than the rates for the silt loam soil (5.02 mg N·kg-1·d-1 and 521.3 ng N2O-N·kg-1·h-1, respectively). The N2O emission ratio from loamy sand soil and silt loam soil ranged from 0.081% to 0.301% and 0.210% to 0.254%, respectively. Soil texture significantly affected net nitrogen transformation rates and greenhouse gas emissions. The lower soil pH and the lower organic carbon and water-soluble organic carbon concentrations in the loamy sand soil were the main reasons for the significantly lower net nitrification rate, net mineralization rate, and emission rates of N2O and CO2, as compared with the silt loam soil. |
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