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| Effects of drying-wetting and additional nitrogen on CO2 and N2O emissions from farmland soils |
| Received:November 23, 2017 |
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| KeyWord:drying-rewetting cycles;nitrogen addition;CO2 production;N2O release;dissolved organic carbon;inorganic nitrogen |
| Author Name | Affiliation | E-mail | | ZHANG Chuan-geng | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453003, China | | | GAO Yang | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453003, China | gaoyang@caas.cn | | WANG Guang-shuai | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453003, China | | | LI Shuang | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453003, China | |
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| Abstract: |
| Under laboratory controlled conditions, the effects of drying-wetting cycles (dry-wet frequency:0, 2, 6 and 12 cycles) and nitrogen addition on soil CO2 and N2O release patterns were investigated with soils of fluvo-aquic sandy loam and fluvo-aquic clay loam, which were typical soils in the Huang-Huai-Hai Plain. The results showed that the drying-wetting cycles and nitrogen addition significantly increased the release rate of CO2 and N2O in the sandy and clay loam soil. The longer the drying period, the stronger the excitation effect of nitrogen addition on the soil CO2 release rate, whereas the shorter the drying period, the stronger the excitation effect of nitrogen addition on the soil N2O release rate. There were similar response patterns of soil greenhouse gas (CO2 and N2O) release rates to the drying-wetting cycle between the two cropland soils. Compared with the clay loam soil, the sandy loam soil presented a more intense response of carbon and nitrogen mineralization to the drying-wetting cycle. The dissolved organic carbon and inorganic nitrogen content, and the greenhouse gas release rate in the sandy loam soil were significantly greater than that of the clay loam soil. Under the condition of nitrogen addition, the drying-wetting cycle significantly increased the dissolved organic carbon and inorganic nitrogen content in the sandy loam and clay loam soil, which increased the probability of inorganic nitrogen (NO3- and NH4+) leaching loss and the green house gases (CO2 and N2O) emission in agricultural production. |
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