|
| Effects of Biochar on Soil Physichemical Properties and N2O, CO2 Emissions from Vegetable-planting Red Soil |
| |
| View Full Text View/Add Comment Download reader |
| KeyWord:biochar；N2O；CO2；soil physichemical properties |
| Author Name | Affiliation | | HE Fei-fei | College of Bioscience and Biotechnology, Hunan Agricultural University
School of Agriculture, Yunnan Univesity | | RONG Xiang-min | College of Resources and Environment, Hunan Agricultural University | | LIANG Yun-shan | College of Bioscience and Biotechnology, Hunan Agricultural University | | WU Ai-ping | College of Bioscience and Biotechnology, Hunan Agricultural University | | LIU Qiang | College of Resources and Environment, Hunan Agricultural University |
|
| Hits: 3764 |
| Download times: 4065 |
| Abstract: |
| Biochar from crop residues is one of the most recent environmental management approaches proposed for both carbon sequestration and global warming mitigation. Large greenhouse gas fluxes emitted from vegetable-planting soil induced by application of excessive amounts of chemical fertilizer and/or manure, and frequent irrigation are drawing more and more attention in China. However, few data of effect of biochar on soil physichemical properties and greenhouse gas fluxes from vegetable-planting soil are available. In a pot experiment with vegetable-planting acidic red soil, biochar was added to the soil（0, 2%, 5%, 10% dry soil weight） in a-60 day growing season so to measure the effect of biochar treatments on soil properties at final harvest. N2O and CO2 emmissions were monitered every 1~4 day after fertilization or irrigation events during experiment period. The results showed that, aboveground dry weight and underground dry weight with treatment NB0.1（10% dry soil weight） was significant higher than that of other treatments. Biochar incorporation into the soil increased soil pH, soil CEC and water holding capacity（WHC） at the end of experiment. Compared with treatment NB0（N fertilization, no biochar）, biochar treatments decreased soil NH+4-N, NO-2-N content and N2O emissions, while increased soil NO-3-N content and CO2 emissions at experiment end. With stepwise regression anlysis, decreasing soil NH+4-N resulting from biochar addition, was independent factor for N2O mitigation, while soil pH value was the most important reason for CO2 emissions in the experiment. Further studies are now required to assess the temporal dynamics of the carbon and nitrogen pools involved, and effect of soil physichemical properties change on soil C and N turnover dynamics. |
|
|
|
