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.