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| Effects of different biochars on N2O and CO2 emission from acidified tea field soil |
| Received:June 13, 2017 |
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| KeyWord:biochar;N2O emission;CO2 emission;pH;dissolved organic carbon |
| Author Name | Affiliation | E-mail | | SUN Yun | College of Recourses and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070, China | | | HE Zhi-long | College of Recourses and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070, China | | | LIN Shan | College of Recourses and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070, China | linshan@mail.hzau.edu.cn | | ZHANG Shui-qing | College of Recourses and Environment, Huazhong Agricultural University/Key Laboratory of Arable Land Conservation in Middle and Lower Reaches of Yangtze River, Ministry of Agriculture, Wuhan 430070, China
Institute of Plant Nutrition and Environmental Resources Science, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China | zsq510@163.com | | LIU Wei-yang | College of Plant Science and Technology, Tarim University, Alar 843300, China | |
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| Abstract: |
| An incubation experiment was conducted to determine the effects of the addition of three kinds of biochars (wheat straw, willow branches, and coconut shell) on acidified tea field soil properties and greenhouse gas emissions. In this experiment, the amount of biochar was 20 g·kg-1, whereas urea was used as an additional nitrogen source for nitrogen fertilizer treatment at the rate of 100 mg·kg-1. The results showed that biochar addition was beneficial to improve the pH value of acidified tea field soil, and the soil pH of the willow biochar addition treatment was 6.71, which was significantly higher than that of the other treatments. Significant differences were noted between the biochar treatments for soil dissolved organic carbon (DOC) content. Compared with that of the control treatment, the soil DOC content increased by 95.6% in the willow biochar treatment and decreased by 36.1% in the coconut shell biochar treatment, whereas no significant difference in DOC was noted in wheat straw biochar (P>0.05). The reduction of soil nitrification and denitrification rate caused by biochar application might have reduced soil N2O emissions, and the application of coconut shell biochar reduced N2O emissions to 91.7%, which was the most significant reduction. When combined with nitrogen application, willow biochar treatment caused significantly higher N2O emissions than those from the other biochar treatments. Compared with N2O emissions in wheat straw and coconut shell biochar treatments, the N2O emissions in willow biochar treatment were considerably more sensitive to nitrogen addition. Biochar addition promoted CO2 emission from the soil, with the highest CO2 emissions from the willow biochar treatment and soil CO2 fluxes having significant positive correlation with pH value and DOC contents. Moreover, nitrogen addition reduced the soil pH value and increased N2O emission, but had no significant effect on soil DOC content. |
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