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| Effects of biochar on water holding capacity and nitrogen leaching of sandy soil column from a Beijing suburb |
| Received:January 24, 2017 |
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| KeyWord:biochar;land desertification;sandy soil;nitrogen leaching;water holding capacity |
| Author Name | Affiliation | E-mail | | WANG Yan | Beijing Research & Development Center for Grasses and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China
College of Resources and Environment Science, Hebei Agricultural University, Baoding 071001, China | | | PANG Zhuo | Beijing Research & Development Center for Grasses and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | JIA Yue | Beijing Research & Development Center for Grasses and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | WANG Qing-hai | Beijing Research & Development Center for Grasses and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | | | LIU Wen-ju | College of Resources and Environment Science, Hebei Agricultural University, Baoding 071001, China | | | XIE Zu-bin | Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHENG Rui-lun | Beijing Research & Development Center for Grasses and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China | zhengruilun@grass-env.com |
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| Abstract: |
| A soil column experiment was conducted to examine the effects of biochar application on leachate volume and leaching of N. Sandy soil(0~90 cm in depth) was collected in a Beijing suburb via stratified sampling. And then, the sandy soil was filled in Plexiglas pipes based on the in situ soil bulk density and moisture content of each soil layer. Biochar was homogenized into the topsoil(0~20 cm) at rates(W/W) of 0%, 0.5%, 1%, 2%, and 4%. A conventional dose of N fertilizer(0.56 t N·hm-2) was also added into the topsoil of each soil column. Deionized water was dropped into the soil columns, and the irrigation amount was based on the average annual rainfall of Beijing(616.6 mm). The results showed that, with increasing biochar concentration, the cumulative leachate volume and leaching of total N decreased by up to 41.3% and 22.7%, respectively, compared with the nil biochar addition treatment, after nine leaching events. The total N concentration of the topsoil increased significantly(P<0.05), by up to 158%, after biochar addition. The amount of inorganic N retained in the soil column after the total leaching was 19.5%~91.9% more for the biochar addition treatment than for the control. In addition, biochar addition decreased cumulative leaching of dissolved organic carbon, by up to 22.8%. The pH value and electrical conductivity of the leachates increased with increasing biochar concentration, and the topsoil retained higher moisture content following addition of greater biochar amount during the 9 times leaching. Correlation analysis indicated that cumulative leaching of total N positively correlated to leachate volume(r=0.978, P<0.01), but not to total N concentration of the leachate. Biochar addition could improve the water holding capacity of the sandy soil Beijing suburb and retard the down migration of water and nitrogen, thereby reducing leaching loss of water and nitrogen, improving their use efficiency, and mitigating the risk of nitrogen contamination of groundwater. |
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