数字农科院2.0

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

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

作者机构：

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

期刊名称： European Journal of Agronomy

ISSN： 1161-0301

年卷期： 2025 年 169 卷

页码：

收录情况： SCIE（2025版）

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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