|
| Effect of Biochar Amendment on Nitrogen Leaching in Saline Soil |
| |
| View Full Text View/Add Comment Download reader |
| KeyWord:biochar; corn straw; salinity; nitrate nitrogen; total nitrogen |
| Author Name | Affiliation | | YANG Fang | State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002
University of Chinese Academy of Sciences, Beijing 100049 | | LI Xin-qing | State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002 | | XING Ying | Guizhou Normal University, Guiyang 550001 | | CHENG Hong-guang | State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002 | | ZHANG Li-ke | State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002
University of Chinese Academy of Sciences, Beijing 100049 | | HE Yun-yong | State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002
University of Chinese Academy of Sciences, Beijing 100049 | | WANG Bing | State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002 |
|
| Hits: 2531 |
| Download times: 3204 |
| Abstract: |
| Biochar has been showed to improve soil structure and reduce nutrient leaching in highly weathered tropical soils and acidic temperate soils. However, there is little information available about the effect of biochar on temperate alkaline and/or saline soils in arid areas. In a laboratory study, ammonium and nitrate in soil leachate were monitored at different simulated precipitation after treatment with biochar. An alkaline soil was collected from Kashgar oasis, Xinjiang autonomous region. Biochar was produced from corn stover at 550 ℃, and mixed thoroughly with the soil at 0%, 1.0%, 5.0% and 10.0%（W/W） ratio. Compared with the control, applications of biochar at 5% and 10% reduced ammonium leaching by 31.14% and 52.43%, respectively, while biochar addition at 1% increased ammonium leaching by 85.95%. Accumulated leaching of ammonium-nitrogen increased with accumulated precipitation. The leaching losses of nitrate-nitrogen and total nitrogen were reduced by 24.79% and 38.19%, 50.01% and 16.13%, and 29.98% and 33.83% for 1.0%, 5.0% and 10.0% biochar additions, respectively, as compared with the control. The leaching of nitrate-nitrogen and total nitrogen occurred most during the first three precipitation events or about the first 140 mm of precipitation, and phased out at about 190 mm precipitation in 0%, 1.0%, and 5.0% biochar treatments. However, this phaseout was postponed at about 290 mm precipitationin in 10% biochar treatment. The application of biochar also increased soil water-holding capacity by an average of 20.95%. These results indicate that biochar application in saline and/or alkaline soils in arid areas could significantly reduce the leaching losses of nitrogen and enhance soil water holding capacity. |
|
|
|
