Elevated atmospheric CO2 and warming enhance the acquisition of soil-derived nitrogen rather than urea fertilizer by rice cultivars.
| 第一作者： |
Zhang, Jinyuan |
| 英文第一作者： |
Zhang, Jinyuan |
| 联系作者： |
Yu, Zhenhua; Jin, Jian |
| 英文联系作者： |
Yu, Zhenhua; Jin, Jian |
| 发表年度： |
2022 |
| 卷： |
324 |
| 摘要： |
Plant nitrogen (N) acquisition is essential to both crop growth and yield. A rational N management strategy for agricultural systems under climate change is required but a knowledge gap still exists regarding plant N uptake and N origin (soil-derived N or fertilizer-derived N) in response to elevated atmospheric CO2 and warming. Our study investigated the responses of soil- or fertilizer-derived N uptake and yield of different cultivars of rice (Oryza sativa L.) to climate change. Five cultivars in the pedigree of a widely-grown rice cultivar Wuyoudao1 were supplied with and without urea, a commonly used N fertilizer in paddy soils and grown in open-top chambers under elevated CO2 (700 ppm) and warming (2 degrees C higher than the air temperature). Plant N origins were traced using N-15-labeling technique (urea of 5% N-15 atom). Compared to the control, elevated CO2 and warming increased N uptake by 17%, irrespective of N supply. Soil-N rather than fertilizer-N was the source of the increased N uptake. The increased soil-N uptake resulted in the enhancement of rice yield under climate change. Urea application did not alter the yield response to elevated CO2 and warming compared to the non-N supply, but did stimulate plant uptake of the soil-derived N. Although genetic improvement of rice germplasm resulted in an increase in plant N acquisition and yield, the history of crop breeding since 1935 did not alter the climate-change-induced response in terms of plant N acquisition. Our results suggest that climate change may lead to the depletion of the recalcitrant soil N pool in paddy soils, and that fertilizer-N-use efficiency may need to be factored into future breeding for rice genotypes adapting well to climate change. |
| 刊物名称： |
Agricultural and Forest Meteorology |
| 参与作者： |
Zhang, J. Y. Li, Y. S. Yu, Z. H. Adams, J. Tang, C. X. Wang, G. H. Liu, X. B. Liu, J. J. Franks, A. Liu, J. D. Zhang, S. Q. Jin, J. |
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