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| DOI： |
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| Impact of Biochar on Nitrogen Leaching and Nitrous Oxide Emission in Paddy Soils |
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GAO Junlian, WANG Yongsheng, ZHANG Aiping, ZHU Donghai, LIU Ruliang
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College of Geoscience and Surveying Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China; Institute of Geographic Science and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; Institute of Environment and Sustainable Development in Agriculture, CAAS, Beijing 100081, China; Farmland Irrigation Research Institute, Chinese Academy of Aricultural Sciences, Xinxiang 453002, China;.Ningxia Academy of Agriculture and Forestry Sciences, Yinchuan 750000, China
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| Abstract: |
| Nitrogen leaching and emission as greenhouse gases are an important environmental issue in agricultural production. This paper investigated how optimizing fertilization and amending soil with biochar could reduce nitrate leaching and N2O emission from a paddy field in Yellow River Irrigation Region inNinxia. Biochar was applied to soil at three rates (4.5, 9 and 13.5 t/hm2 per years), and no biochar amendment was taken as the control. The results showed that biochar amendment reduced leaching of nitrate and ammonium by 18.23%～26.03% and 28.86%～52.05% respectively. The C1 treatment (4.5 t/hm2) did not significantly reduce N2O emissions, but C2 (9 t/hm2) and C3 (13.5 t/hm2) did and reduced accumulative N2O emission by 25.13% and 28.88%, respectively. Amending soil with biochar increased the uptake of nitrogen by plant roots, thereby reducing nitrate and ammonium in soil as well as soil density, which is the main reason behind the reduction in nitrogen leaching and emissions from soil. Our results revealed that amending the paddy soil with biochar at 9 t/hm2 can effectively increase nitrogen uptake and reducenitrogen loss as a result. |
| Key words: biochar; Ningxia Yellow River irrigation region; nitrogen leaching; nitrous oxide emission |
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