|
| Carbon Dioxide Emissions and Organic Carbon Contents of Fluvo-aquic Soil as Influenced by Straw and Lignin and Their Biochars |
| Received:September 26, 2014 |
| View Full Text View/Add Comment Download reader |
| KeyWord:fluvo-aquic soil;straw;lignin;biochar;CO2 emission;organic carbon |
| Author Name | Affiliation | E-mail | | ZHANG Jie | The Graduate School Chinese Academy of Agricultural Science, Beijing 100081, China | | | HUANG Jin-sheng | Agricultural Resources and Environment Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China | | | LIU Jia | Soil and Fertilizer & Resources and Environment Institute, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, China | | | LIU Rong-le | The Graduate School Chinese Academy of Agricultural Science, Beijing 100081, China | rlliu@caas.net.cn |
|
| Hits: 4227 |
| Download times: 2816 |
| Abstract: |
| Additions of organic materials could enhance soil organic carbon and may also promote carbon dioxide(CO2) emissions. In an incubation experiment, we examined the CO2 emissions and organic carbon contents of fluvo-aquic soil after applying straw and lignin and their biochars. The rate and cumulative amount of CO2 emissions and the dynamic changes of total organic carbon, dissolved organic carbon(DOC), readily oxidation carbon(ROC) and microbial biomass carbon(MBC) were measured. Compared with the control, the rate and accumulative amount of CO2 emissions, and organic carbon mineralization intensity were all significantly increased by straw or lignin additions, but not by their biochars. During the first 30 d incubation, all materials significantly increased soil organic carbon. After one year, however, higher soil organic carbon was found only in the biochar treatments. Straw or lignin additions significantly promoted DOC, ROC and MBC, but their biochars did not. The accumulative emissions of soil CO2 were influenced directly by soil DOC, ROC(176 mmol·L-1 KMnO4), ROC(33 mmol·L-1 KMnO4), and indirectly by ROC(333 mmol·L-1 KMnO4). These results suggest that agricultural applications of biochars have positive roles in promoting carbon sequestration and reducing CO2 emissions. |
|
|
|
