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| Effect of Biochar on Nitrous Oxide Emissions from Dryland Spring Corn Field on the Loess Plateau |
| Received:March 20, 2014 |
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| KeyWord:biochar;nitrous oxide;dryland corn;nitrogen fertilizer |
| Author Name | Affiliation | E-mail | | HUANG Hai-zhou | State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling 712100, China
College of Forestry, Northwest A&F University, Yangling 712100, China | | | XIAO Qian | State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling 712100, China
College of Forestry, Northwest A&F University, Yangling 712100, China | | | SHEN Yu-fang | State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Northwest A&F University, Yangling 712100, China | shenyufang@nwsuaf.edu.cn | | LI Shi-qing | College of Resources and Environment, Northwest A&F University, Yangling 712100, China | |
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| Abstract: |
| A field experiment was conducted to measure N2O emissions using static chamber-gas chromatography method. Six treatments were used:C0N0(no biochar, no N), C2N0(20 t·hm-2 biochar, no N), C0N1(no biochar, 225 kg N·hm-2), C1N1(10 t·hm-2 biochar, 225 kg N·hm-2), C2N1(20 t·hm-2 biochar, 225 kg N· hm-2) and C3N1(30 t·hm-2 biochar, 225 kg N·hm-2). Compared to C0N1 treatment, biochar amendments decreased cumulative N2O emissions by 3.40%, 9.89% and 19.24% for the C1N1, C2N1 and C3N1, respectively. Additions of biochar increased soil temperature at 0 cm and 10 cm soil layers, but decreased mineral N content in 0~20 cm soil. Soil moisture in 0~20 cm was not affected by biochar. A significant positive correlation was found between N2O emissions and soil NO3--N, NH4+-N content and soil moisture in 0~20 cm soil, while a negative correction were observed between N2O emissions and soil temperature at 0 cm and 10 cm. The reduction in mineral N concentrations by biochar was the main factor that reduced the N2O emissions in dryland spring corn field. |
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