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| Impact of Soil Temperature and Moisture on Soil N2O Emission from Mollisols Under Different Land-use Types |
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| KeyWord:water-filled pore space（WFPS）; emission flux; nitrous oxide; inorganic nitrogen |
| Author Name | Affiliation | | SHI Hong-ai | Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China
College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | LI Lu-jun | Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China | | YOU Meng-yang | Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China | | DING Jiao | Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China
College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China | | WANG Shuai | State Farm 852 of Heilongjiang, Shuangyashan 155620, China | | HAN Xiao-zeng | Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Harbin 150081, China |
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| Abstract: |
| Using static closed chamber and gas chromatography techniques, we examined the patterns of soil nitrous oxide（N2O） emission from Mollisols in Northeast China as affected by changes of land use（grassland, bare land, and cropland）, and related soil N2O fluxes to soil temperature and moisture. The results showed that, during the monitoring period（from May 27 to September 30, 2011）, the cumulative N2O emission was higher in cropland（70.16 mg N·m-2） than those in grassland（52.08 mg N·m-2） and bare land（64.43 mg N·m-2） by 35% and 9%, respectively. The mean N2O emission fluxes in grassland, bare land, and cropland were 16.56 μg N·m-2·h-1, 20.36 μg N·m-2·h-1, and 21.44 μg N·m-2·h-1, respectively. In grassland and bare land, there were no significant correlations between soil N2O flux and soil temperature and soil moisture（water-filled pore space）, whereas in cropland, soil N2O flux was significantly correlated with soil temperature（5 cm, 10 cm） and soil moisture（5 cm）（all P<0.05）. In addition, soil cumulative N2O emissions were positively correlated with soil nitrate nitrogen and inorganic nitrogen content. Our results suggest that conversion of grassland to cropland in Mollisols can promote soil N2O emission, and the main driving factors for soil N2O emission vary under different land uses. |
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