不同生物质炭输入水平下黄绵土N<sub>2</sub>O日排放特性

宋敏; 齐鹏; 蔡立群; 张仁陟; Stephen Yeboah; 武均; 王旭燕; 潘占东

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.