|
| Effects of mixed application of biochar and desulfurized gypsum on carbon emissions from a paddy field |
| Received:April 25, 2023 |
| View Full Text View/Add Comment Download reader |
| KeyWord:biochar;desulfurized gypsum;rice field;carbon dioxide;methane;carbon budget |
| Author Name | Affiliation | E-mail | | XU Ying | College of Resource & Environment, Southwest University, Chongqing 400716, China | | | LUO Manlin | College of Resource & Environment, Southwest University, Chongqing 400716, China | | | MU Zhijian | College of Resource & Environment, Southwest University, Chongqing 400716, China
Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400716, China
Key Laboratory of Arable Land Conservation for Southwest China, Ministry of Agriculture and Rural Affairs, Chongqing 400716, China | muzj@swu.edu.cn | | LEI Yong | Soil and Fertilizer Station of Qujing, Yunnan Province, Qujing 655000, China | | | SHAN Qingrao | Soil and Fertilizer Station of Qujing, Yunnan Province, Qujing 655000, China | | | LIU Shuaipeng | College of Resource & Environment, Southwest University, Chongqing 400716, China | | | ZHAO Xiulan | College of Resource & Environment, Southwest University, Chongqing 400716, China
Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400716, China | |
|
| Hits: 646 |
| Download times: 614 |
| Abstract: |
| To investigate the effectiveness of the combined application of biochar and desulfurized gypsum in reducing CO2 and CH4 emissions and the carbon budget in rice fields, six treatments were established in a paddy field and the soil CO2 and CH4 fluxes were measured for one year using the static chamber-GC method. The treatments were as follows:bare plot(B), rice planting plot(R), R amended with biochar at a rate of 4 t·hm-2(RC4), RC4 plus desulfurized gypsum(G) applied at a rate of 4 t·hm-2(RC4G4), RC4 plus G applied at a rate of 8 t·hm-2(RC4G8), and RC4 plus G applied at a rate of 16 t·hm-2(RC4G16). During the rice growing season, the R plot released CH4 at a rate of 86 kg·hm-2. Compared with the amount emitted by R, CH4 emission was enhanced by 52% with the exclusive application of biochar(RC4), but this was suppressed by 69%-91% with the application of desulfurized gypsum. CH4 emissions during the fallow period were relatively low for the different treatments(6.24-13.4 kg·hm-2). By contrast, the impacts of biochar and desulfurized gypsum on the soil CO2 flux were much more significant during the fallow period than during the rice growing season. The annual soil CO2 emissions from the differently treated plots ranged from 4 525 to 6 634 kg·hm-2, 68%-76% of which were emitted during the fallow period. According to the annual carbon budget, the RC4G16 treatment was carbon neutral, whereas the other treatments acted as a net atmospheric carbon source with emission intensity values ranging from 573 to 4 065 kg·hm-2. In conclusion, in this study, the application of biochar alone promoted greenhouse gas emissions, whereas the additional application of desulfurized gypsum offset the negative effect of biochar and reduced greenhouse gas emissions, with the effect increasing with increase in the dosage. |
|
|
|
