| Effects of biochar application on soil hydrothermal environment and soil respiration in winter wheat field |
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| DOI：10.7606/j.issn.1000-7601.2022.03.24 |
| Key Words: biochar soil respiration soil hydrothermal winter wheat |
| Author Name | Affiliation | | L Mengfan | College of Agriculture, Northwest Agriculture and Forestry University, Yangling, Shaanxi 712100, China | | MA Xiangcheng | College of Agriculture, Northwest Agriculture and Forestry University, Yangling, Shaanxi 712100, China | | CAI Tie | College of Agriculture, Northwest Agriculture and Forestry University, Yangling, Shaanxi 712100, China | | JIA Zhikuan | College of Agriculture, Northwest Agriculture and Forestry University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| It is important to explore the impacts of biochar application on soil hydrothermal factors and soil respiration in winter wheat fields. Furthermore, it is practical for applying biochar in wheat fields tosequester carbon and reduce emission in farmland. A winter wheat field experiment with biochar application was conducted during 2018-2021 in Guanzhong Irrigation District, China. The biochar application levels were: 0 (C0), 10 (C10), and 20 t·hm-2·a-1 (C20). The soil temperature, moisture, respiration rate, and yield were measured during the wheat growing season to determine the effects of different amounts of biochar on soil hydrothermal factors and soil respiration in winter wheat fields. There were significant differences in the soil respiration rate and the cumulative CO2 emission during the growth period of each treatment (P<0.05), and both showed the same trend as C0>C20>C10. The biochar application increased the average soil temperature during the growth period. It significantly increased the 0~20 cm soil moisture content (P<0.05) and reduced the variation of soil moisture content during the growth period. The average soil moisture content of C10 and C20 treatments increased by 17.0% and 29.0% compared with C0 in three years.The 5cm and 10 cm soil temperatures explained 54.7%~61.1% and 57.1%~64.5% of soil respiration, respectively. However, the correlation between soil respiration and 0~20 cm soil moisture content was not significant. In this study, Q10 varied between 3.25~3.71, and it increased with the increase of the amount of biochar applied. The average yield of C10 and C20 wheat was significantly higher than that of C0 by 7.1% and 5.3%. The application of biochar increased winter wheat yield in Guanzhong Plain, reduced soil respiration and regulated hydrothermal factors. However, it increased the temperature sensitivity of soil respiration. |
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