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| The impact of elevated atmospheric CO2 concentrations and temperatures on the organic nitrogen composition in the rhizosphere soil of cereals in Mollisol |
| Received:March 19, 2024 |
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| KeyWord:climate change;organic nitrogen fractions;nitrogen mineralization;gramineous crops |
| Author Name | Affiliation | E-mail | | MAO Mengfan | Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Key Laboratory of Black Soil Agroecology, Harbin 150081
University of Chinese Academy of Science, Beijing 100049 | | | GAO Lizheng | Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Key Laboratory of Black Soil Agroecology, Harbin 150081
University of Chinese Academy of Science, Beijing 100049 | | | LONG Yong | Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Key Laboratory of Black Soil Agroecology, Harbin 150081
University of Chinese Academy of Science, Beijing 100049 | | | XU Ying | Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Key Laboratory of Black Soil Agroecology, Harbin 150081
University of Chinese Academy of Science, Beijing 100049 | | | LI Yansheng | Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Key Laboratory of Black Soil Agroecology, Harbin 150081 | | | JIN Jian | Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Key Laboratory of Black Soil Agroecology, Harbin 150081 | | | YU Zhenhua | Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Key Laboratory of Black Soil Agroecology, Harbin 150081 | yuzhenhua@iga.ac.cn |
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| Abstract: |
| To elucidate the potential impacts of increased atmospheric CO2 concentration and temperature rise on the changes in soil organic nitrogen components of major cereal crops in Mollisol, this study employed open-top chambers（OTCs）to simulate elevated atmospheric CO2 concentration（550 μmol·mol-1）and temperature（+2 ℃）. Normal atmospheric CO2 concentration and temperature were used as controls. Soil samples from the rhizosphere of different crops were analyzed for acid hydrolyzable organic nitrogen components, and their correlation with soil physicochemical properties was investigated. The results revealed that the influence of elevated atmospheric CO2 concentration and temperature on acid hydrolyzable total nitrogen and its components in wheat rhizosphere was greater than that in maize and rice. Specifically, in wheat rhizosphere soil, both total nitrogen and its components were affected to varying degrees by elevated atmospheric CO2 concentration and temperature, as well as their interaction. In rice rhizosphere, total nitrogen and unidentified nitrogen was affected by the interaction between the two factors, while in maize rhizosphere, neither total nitrogen nor its components were affected by either the increase in CO2 concentration or temperature alone, or their interaction. Furthermore, compared to the control, under the interactive effect of CO2 concentration and temperature increase, the proportions of different organic nitrogen components to total nitrogen varied among different crops. In the soils of three types of crops, amino acid nitrogen and ammonium nitrogen remain the primary contributors to acid hydrolysable nitrogen components, followed by unknown nitrogen, with amino sugar nitrogen content being the lowest. Correlation analyses showed that acid hydrolysable nitrogen compontents are significantly affected by total nitrogen and available phosphorus. The results of the study indicated that under future conditions of elevated atmospheric CO2 concentration and temperature, the application of N fertiliser for wheat should be moderately reduced, the use of N fertiliser for rice and maize should be increased, and the soil physicochemical properties should be adjusted to improve the soil nitrogen effectiveness. |
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