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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第46卷

期数:

2024年第03期

页码:

298-306

栏目:

环境与可持续发展

出版日期:

2024-05-15

文章信息/Info

Title:

Effect of Carbon Dioxide Enrichment on ¹⁵NNatural Abundance of Leaves

文章编号:

1672-6561(2024)03-0298-09

作者:

李蕾^*; 吴明君; 林冰艳; 孙嫣然; 徐艺宁; 汪旭明; 巩晓颖

(福建师范大学 地理科学学院/碳中和未来技术学院,福建 福州 350007)

Author(s):

LI Lei^*;  WU Ming-jun;  LIN Bing-yan;  SUN Yan-ran;  XU Yi-ning;  WANG Xu-ming;  GONG Xiao-ying

(School of Geographical Sciences/School ofCarbon Neutrality Future Technology, Fujian Normal University, Fuzhou 350007, Fujian, China)

关键词:

植物氮代谢;  氮同化;  ¹⁵N自然丰度;  CO₂浓度;  叶龄;  氮利用效率;  氮含量;  稀释效应

Keywords:

plant N metabolism;  N assimilation;  ¹⁵N natural abundance;  CO₂ concentration;  leaf age;  N-use efficiency;  N content;  dilution effect

分类号:

Q945

DOI:

10.19814/j.jese.2023.12003

文献标志码:

A

摘要:

大气CO₂浓度上升通常会提高植物生产力并伴随叶片氮含量的下降。然而大气CO₂如何影响叶片¹⁵N丰度及其相关机理还不清楚。以小麦和向日葵为实验材料,测定了两个CO₂浓度(410与820 μmol?mol^-1)处理下叶片的氮同位比值(δ¹⁵N)和氮含量。结果表明:小麦和向日葵叶片氮含量随CO₂浓度升高呈下降趋势,然而δ¹⁵N对CO₂浓度倍增的响应存在差异。在高CO₂浓度处理下小麦叶片δ¹⁵N显著下降6.5‰,而向日葵叶片δ¹⁵N小幅上升2.1‰,且叶片和地上部生物量显著增加。基于此,小麦的氮营养特征符合氮同化受限假说,而向日葵符合稀释效应假说。小麦叶片δ¹⁵N随叶龄或者细胞年龄的增加而显著下降,因此在利用¹⁵N来研究植物氮代谢时需要区分叶龄的影响。整合分析结果表明,CO₂浓度升高导致非豆科C₃植物的δ¹⁵N显著下降达0.3‰,与小麦的研究结果相符。综上所述,限制硝态氮同化是CO₂影响植物氮代谢和¹⁵N丰度的重要机制。

Abstract:

Plant productivity is enhanced by elevated atmospheric CO₂ concentration, butNcontentof leafis reduced. How atmospheric CO₂ affects leaf ¹⁵N compositionand the related mechanisms remain unclear. δ¹⁵N and N content of wheat and sunflower leaves were determined under two CO₂concentration(410 and 820 μmol?mol^-1)treatments. The results show that the N content of both species decreases withelevatedCO₂ concentration, but the response of δ¹⁵N to CO₂ enrichment is different between wheat and sunflower. Under high CO₂concentration treatment,δ¹⁵N of wheat leaves decreases significantly by 6.5‰, while δ¹⁵N of sunflower leaves increases slightly by 2.1‰, accompanied by a significant increase in leaf mass and aboveground biomass. Therefore, Nnutrition characteristics of wheat are consistent withNassimilation limitation hypothesis, while the response of sunflower is consistent with dilution effect hypothesis. δ¹⁵N in wheat leaves decreases significantly with leaf aging and cell aging. Therefore, when using δ¹⁵N to infer environmental impacts on plant N metabolism, it is necessary to account for the leaf age effect. The results of meta-analysis show that δ¹⁵N of non-legume C₃ plants decreases significantly by 0.3‰ under elevated CO₂concentration,in line with our results on wheat plants. Thestudy shows that the inhibited N assimilation is an important mechanism related to the CO₂ effect onNmetabolism and ¹⁵N content of plants.

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2023-12-04; 修回日期:2024-03-20
基金项目:国家自然科学基金项目(31870377,32120103005,32201277)
*通信作者:李 蕾(1986-),女,江西东乡人,实验师,E-mail:LL0710@fjnu.edu.cn。

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更新日期/Last Update: 2024-05-30