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| Pollutant Releases from Crop Residue Burning and Carbon Emission Mitigation Potential by Biochar in Xinjiang Oasis |
| Received:December 17, 2014 |
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| KeyWord:crop residue;burning;atmospheric emission inventory;biochar;carbon emission mitigation potential |
| Author Name | Affiliation | E-mail | | YANG Le | College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China
College of Agriculture, Shihezi University, Shihezi 832003, China | | | DENG Hui | School of Chemistry and Chemical Engineering, Shihezi University, Shihezi 832003, China | | | LI Guo-xue | College of Resource and Environmental Science, China Agricultural University, Beijing 100193, China | ligx@cau.edu.cn | | WANG Qi | College of Agriculture, Shihezi University, Shihezi 832003, China | |
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| Abstract: |
| Air pollutant releases from crop residue burning were estimated based on the 2004 to 2013 yield data of major crops using emission factor method, and carbon emission mitigation potential of turning crop straw into biochar was also calculated, in Xinjiang Oasis. Results showed that amount of crop residue burned in 2013 in Xinjiang area were about 6.0×106 t, yielding the following atmospheric pollutants:9.0×106 t of CO2, 5.5×105 t of CO, 1.6×104 t of CH4, 9.4×104 t of NMVOC, 1.9×104 t of OC, 3.9×103 t of BC, 2.4×103 t of SO2, 1.8×104 t of NOx, 7.8×103 t of NH3 and 1.2×105 t of PM2.5. The total carbon emission from crop residue burning was 2.7×106 t. Carbon dioxide and CO were the major pollutants in emission inventory, accounting for 91.6% and 5.6% of the total, respectively. Cotton stalk was the largest contributor with 43.3% of total atmospheric emission, followed by wheat straw and corn stalk with contributions of 28.3% and 21.9%, respectively. Calculation showed that turning the burned crop resides(cotton, wheat and corn) into biochar could reduce carbon emission by 54.9% annually, while might sequester 3.6×106 t of carbon and 1.3×107 t CO2e(carbon dioxide equivalent) over 100 years, even if biochar applications did not increase soil organic carbon content. Therefore, biochar would be an good approach to sustainable carbon sequestration. |
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