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| Effects of biochar application on soil organic carbon mineralization at different depths in paddy soil |
| Received:March 24, 2020 |
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| KeyWord:biochar;deep soil;paddy soil;organic carbon mineralization |
| Author Name | Affiliation | E-mail | | WANG Jia-meng | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | | LIU Wei | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | | LIU Zhi-wei | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | | LIU Xiu-xia | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | | WU Xiu-lan | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | | BIAN Rong-jun | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | | ZHENG Ju-feng | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | zhengjufeng@njau.edu.cn | | LI Lian-qing | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | | | PAN Gen-xing | Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, China
Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing 210095, China | |
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| Abstract: |
| This study aimed to clarify the effect of biochar on soil organic carbon mineralization characteristics of paddy soil at different depths and to provide a scientific basis for assessing the carbon sequestration effects of biochar in paddy soil. Soil samples were collected at seven different depths in a rice-cropping field located in Taihu Lake Region, which had received one dose of biochar two years ago. A laboratory experiment was conducted to analyze the organic carbon distribution and mineralization characteristics of the soil. The results showed that biochar application significantly increased the total organic carbon content in the surface layer(0~10 cm); however, it had no significant effect on the total organic carbon content in the layers below 10 cm. Compared with the control treatment, the biochar application significantly decreased the soil organic carbon mineralization intensity within the upper 40 cm layer. The decrease rate was 23.74%, 37.57%, 37.62%, and 15.95% for the 0~10 cm, 10~20 cm, 20~30 cm, and 30~40 cm layers, respectively. Biochar application significantly decreased the microbial biomass carbon in the 10~40 cm soil layer and the microbial metabolic quotient in the 0~40 cm soil layer, whereas the soil microbial biomass carbon in the surface layer(0~10 cm)was significantly increased by 11.3% in the biochar treatment. Below 40 cm layer, there was no significant change in any of the above indicators for biochar treatment. The results suggest that biochar application can improve the soil organic carbon stability within the 0~40 cm layer in paddy soil on a two-year scale, which is beneficial for the carbon sequestration potential in deep layers of the soil profile. |
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