Optimizing nitrogen fertilization to enhance wheat productivity by regulating canopy-root traits and photosynthesis under elevated atmospheric ammonia concentration

文献类型： 外文期刊

第一作者： Liu, Pengzhao

作者： Liu, Pengzhao;Cheng, Mengwei;Li, Zhipeng;Fan, Zhen;Lin, Yanrong;Yan, Zinan;Cai, Tie;Ren, Xiaolong;Chen, Xiaoli;Liu, Pengzhao;Cheng, Mengwei;Li, Zhipeng;Fan, Zhen;Lin, Yanrong;Cai, Tie;Ren, Xiaolong;Chen, Xiaoli;Zhao, Xining;Liu, Enke

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关键词： Root-canopy ratio; Photosynthetic; Grain yield; Source-sink balance; Elevated atmospheric NH3

期刊名称：EUROPEAN JOURNAL OF AGRONOMY （ 影响因子：5.5； 五年影响因子：5.9 ）

ISSN： 1161-0301

年卷期： 2025 年 169 卷

页码：

收录情况： SCI

摘要： The response of crop growth and yield formation to nitrogen (N) application under elevated atmospheric ammonia (NH3) concentrations remains unclear. We hypothesize that elevated NH3 concentrations combined with different N application rates would affect wheat productivity through regulating canopy-root traits and photosynthetic capacity. Therefore, a three-year field experiment was conducted to clarify the effects of different NH3 concentrations (atmospheric NH3: 0.03 +/- 0.01 mg m-3, ANH3; elevated NH3: 0.30 +/- 0.05 mg m-3, ENH3) and nitrogen application rates (0, 150 and 225 kg N ha-1, denoted as N0, N1 and N2, respectively) on canopy and root growth, photosynthetic capacity, and winter wheat productivity. The results indicated that compared to the ANH3 treatment: (1) ENH3 treatment (EN1, 150 kg N ha-1) effectively regulated both above-and below-ground growth of winter wheat. This resulted in a lower root-canopy (R/C) ratio, stimulating aboveground biomass and nitrogen accumulation, which ultimately increasing grain yield by 4.2-6.5 % and partial productivity of nitrogen fertilizer (NPFP) by 3.3-7.5 %; (2) ENH3 treatment increased leaf area index (LAI) by 3.2-5.3 %, net photosynthetic rate (Pn) by 3.1-5.8 % and relative chlorophyll content (SPAD) by 3.6-8.1 %, which helped maintain higher source activity in winter wheat. ENH3 treatment increased source capacity by 5.4-8.4 % and source-sink ratio by 3.2-4.7 %. Compared to the EN1 treatment, EN2 treatment increased the R/C ratio by 2.8-4.5 %, and both kernel number/leaf ratio (KNL) and kernel weight/leaf ratio (KWL) decreased by 8.1-10.7 % and 4.7-7.2 %, ultimately decreasing grain yield by 11.8-14.4 %. Overall, N rate of 150 kg N ha-1 under elevated NH3 environment improved wheat yield by regulating canopy-root trait and establishing new source-sink balance. This study provides valuable scientific insights into the potential reduction of chemical N use for wheat production in future elevated NH3 environment.

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