| Effects of different fertilizer application rates on soil respiration of dryland winter wheat fields in semi\|arid area |
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| DOI：10.7606/j.issn.1000-7601.2021.06.25 |
| Key Words: soil temperature soil moisture soil respiration fertilization amount winter wheat semi\|arid area |
| Author Name | Affiliation | | HU Zhilin | College of Agriculture, Northwest Agriculture and Forestry University, Yangling, Shaanxi 712100, China | | ZHANG Chun | 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: |
| In order to investigate the effects of different fertilizer application rates on soil respiration in dryland winter wheat fields in semi\|arid area, field experiments with no fertilizer (FN), low fertilizer (FL), medium fertilizer (FM) and high fertilizer (FH) were conducted in Pengyang County, Ningxia Hui Autonomous Region. By monitoring the soil temperature, soil moisture and soil respiration rate of winter wheat field under different fertilizer rates, the characteristics of soil respiration rate change and the correlation with soil hydrothermal factors under different fertilizer rates were analyzed. The results showed that:(1) Fertilization increased the soil temperature of 0~5 cm and 5~10 cm soil depth, and the average soil temperature increase of 0~5 cm and 5~10 cm soil depth was 1.7%~15.0% and 2.0%~21.4%, respectively. (2) Fertilization reduced the soil water content of 0~100 cm soil depth, and with the increase of fertilization rates, FH, FM, and FL decreased by 6.5%~7.0%, 5.0%~5.8%, and 3.5%~4.0%, respectively. (3) Fertilization significantly increased the soil respiration rate of winter wheat in the jointing stage, heading stage, flowering stage, filling stage and maturity stage. In 2018-2019 and 2019-2020, the average soil respiration rates of FL, FM, and FH were increased by 40.0%, 25.5%, and 14.5%, respectively. (4) Fertilization increased CO2 emissions during the whole growth period. With the increase of fertilization rates, CO2 emissions during the whole growth period showed a downward trend, which was represented by FL>FM> FH>FN, and the cumulative emission of CO2 in the soil at each growth stage had significant differences. (5) The correlation analysis between soil respiration rate and soil hydrothermal factors showed that the correlation coefficients between soil respiration and soil temperature of 0~5 cm and 5~10 cm soil depth reached a significant level, and the correlation between soil respiration and soil temperature of 5~10 cm soil depth was significantly higher than that of 0~5 cm soil depth. In addition, there was a significant correlation between soil respiration rate and soil moisture content of 0~10 cm soil depth. (6) Soil moisture and heat factors and soil respiration analysis showed that soil moisture and heat factors explained 81%~89% of soil respiration, which was higher than soil temperature (63%~74%) and soil moisture (46%~75%).The results indicated that soil respiration was regulated by soil temperature and water content. From the perspective of improving farmland ecology and reducing soil respiration, appropriate increase of fertilizer application can effectively reduce soil respiration emissions. |
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