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| Effects of Corn-Stalk Biochar on Inorganic Nitrogen Leaching from Soil |
| Received:August 25, 2014 |
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| KeyWord:biochar;NH4+-N;NH3--N;nitrogen leaching;soil column |
| Author Name | Affiliation | E-mail | | GAI Xia-pu | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | | | LIU Hong-bin | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | | | ZHAI Li-mei | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | | | WANG Hong-yuan | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Key Laboratory of Nonpoint Source Pollution Control, Ministry of Agriculture, Beijing 100081, China | wanghongyuan@caas.cn |
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| Abstract: |
| Biochars have showed to decrease nutrient leaching losses from soils. In this study, a laboratory column study was conducted to examine the effects of biochar applications on leachate volume and leaching of ammonium nitrogen(NH4+-N) and nitrate nitrogen(NH3--N)at different depths of soil. Corn-stalk biochar, obtained at 500 ℃, was applied to a Haplic Luvisol soil at rates of 0(T1), 1%(T2), 2%(T3)and 4%(T4) of soil mass. The results showed that biochar influenced NH4+-N and NH3--N mainly at the initial leaching stage. The retention of NH4+-N largely occurred at 0~10 cm soil depth, whereas most of NH3--N retained at 10~40 cm. Biochar effectively increased water holding capacity of the soil. As a result, addition of biochar reduced the leachate volume by 10% in T2, 20% in T3 and 26% in T4 compared with the control(T1). Inorganic N leaching was reduced by 27%, 48%, and 61% in T2, T3, and T4 treatments, respectively. NH3--N was the major form of leached inorganic N, amounting to 62.4 mg(T2), 44.4 mg(T3), and 34.5 mg(T4), with a reduction of 28%, 49% and 58% in comparison with the control, respectively. Overall, these results demonstrate that applications of biochar could effectively reduce NH4+-N and NH3--N leaching from Haplic Luvisol soil. |
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