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| Short-term effects of different soil moisture contents on greenhouse gas emissions from sandy loam soil in semi-arid regions |
| Received:November 27, 2020 |
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| KeyWord:soil moisture;sandy loam;N2O;CO2;CH4 |
| Author Name | Affiliation | E-mail | | 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 | | | WEI Wei | 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 | | | 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 | mlang@nuist.edu.cn |
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| Abstract: |
| To explore the short-term effects of different soil moisture conditions on greenhouse gas emissions from the soil, an incubation experiment under 60% water holding capacity(WHC), 100% WHC, and flooding conditions was conducted at the laboratory to study the regularity of N2O, CO2, and CH4 emissions from sandy loam soil in the semi-arid region of Heilongjiang Province, China. The results showed that increasing the soil moisture content to 100% WHC had no significant effect on net nitrification rate but significantly promoted N2O emission, as compared to the 60% WHC treatment. The average N2O emission rate in the 100% WHC treatment(0.109 mg N2O-N·kg-1·d-1) was 7.8 times that of 60% WHC treatment(0.014 mg N2O-N·kg-1·d-1). Flooding significantly inhibited nitrification, whereas the emission of N2O was increased to a dramatically high level with an average N2O emission rate of 0.419 mg N2O-N·kg-1·d-1, which was 29.9 and 3.8 times that of the 60% WHC and 100% WHC treatments, respectively. The average emission rates of CO2 and CH4 in the 60% WHC treatment were 9.92 mg CO2-C·kg-1·d-1 and 2.99 μg CH4-C·kg-1·d-1, respectively. Increasing soil moisture content to 100% WHC had no significant effect on emission rates of CO2, and CH4 in sandy loam soil. The average emission rates of CO2 and CH4 in the flooding treatment were 12.7 mg CO2-C·kg-1·d-1 and 5.14 μg CH4-C·kg-1·d-1, respectively, which were significantly higher than the 60% WHC and 100% WHC treatments. The results indicate that attention should be paid to field water management for sandy loam soil in semi-arid regions, and short-term flooding should be avoided to reduce greenhouse gas emissions. |
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