| Diurnal variations of N2O gases emission in loessial soil under biochar application |
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| DOI：10.7606/j.issn.1000-7601.2017.04.21 |
| Key Words: loessial soil biochar N2O emission |
| Author Name | Affiliation | | SONG Min | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Lab of Aridland Crop Science, Lanzhou, Gansu 730070, China
Gansu Province Research Center of Water-saving Agricultural Engineering Technology, Lanzhou, Gansu 730070, China
Guangdong Medical University, Dongguan, Guangdong 523808, China | | QI Peng | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Lab of Aridland Crop Science, Lanzhou, Gansu 730070, China
Gansu Province Research Center of Water-saving Agricultural Engineering Technology, Lanzhou, Gansu 730070, China | | CAI Li-qun | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Lab of Aridland Crop Science, Lanzhou, Gansu 730070, China
Gansu Province Research Center of Water-saving Agricultural Engineering Technology, Lanzhou, Gansu 730070, China | | ZHANG Ren-zhi | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Lab of Aridland Crop Science, Lanzhou, Gansu 730070, China
Gansu Province Research Center of Water-saving Agricultural Engineering Technology, Lanzhou, Gansu 730070, China | | Stephen Yeboah | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Lab of Aridland Crop Science, Lanzhou, Gansu 730070, China
Gansu Province Research Center of Water-saving Agricultural Engineering Technology, Lanzhou, Gansu 730070, China
CSIR-Crops Research Institute, Kumasi, 999064, Ghana | | WU Jun | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Lab of Aridland Crop Science, Lanzhou, Gansu 730070, China
Gansu Province Research Center of Water-saving Agricultural Engineering Technology, Lanzhou, Gansu 730070, China | | WANG Xu-yan | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Lab of Aridland Crop Science, Lanzhou, Gansu 730070, China
Gansu Province Research Center of Water-saving Agricultural Engineering Technology, Lanzhou, Gansu 730070, China | | PAN Zhan-dong | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Gansu Provincial Key Lab of Aridland Crop Science, Lanzhou, Gansu 730070, China
Gansu Province Research Center of Water-saving Agricultural Engineering Technology, Lanzhou, Gansu 730070, China |
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| Abstract: |
| Biochar is a carbon-rich solid product by heating of biomass in an oxygen-limited environment. Biochar application is supposed to have the potential for greenhouse gas mitigation. The aim of this study was to determine the effects of biochar on nitrous oxide (N2O) emissions. The treatments consisted of six different biochar levels, including TT (0 t·hm-2), BT1 (10 t·hm-2), BT2 (20 t·hm-2), BT3 (30 t·hm-2), BT4 (40 t·hm-2), and BT5 (50 t·hm-2), with a randomized complete block design with three replications. Soil moisture and temperature were measured as well as N2O. The results showed that the N2O fluxes had significant difference in diurnal variations among biochar treatments. The loessial soil is a source of N2O emission, and similarly the the loessial soil of the other biochar treatments. The N2O flux emission of soil without biochar input was significantly higher than other treatments. With the increase in the application rate, the accumulate flux emission of N2O showed a “U” type change pattern, and the rate of 30 t·hm-2 showed the better depression effect on N2O gas emission. The total daily emission fluxes of N2O in each treatment were the highest in the daytime. The combination of water and heat caused by the biochar might be the main cause of the different of the whole day N2O gas emission. Temperature is the main influence factor of N2O gas emission under the condition of relatively stable environment. The soil temperature in 10 cm depth increased with increasing the application rate of biochar. The optimal observation duration of the N2O gas is 8 a.m. to 9 a.m. |
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