Does higher crop N utilization lead to lower NH3 volatilization in paddies?

文献类型： 外文期刊

第一作者： Chen, Mengxia

作者： Chen, Mengxia;Ke, Jian;Zhang, Fangqi;Wu, Liquan;Hou, Pengfu;Chen, Mengxia;Yang, Bei;Zhang, Fangqi;Hou, Pengfu;Yang, Linzhang;Xue, Lihong

作者机构：

关键词： Paddy field; N use efficiency; Ammonia volatilization; Root bleeding sap; Leaf area index

期刊名称：FIELD CROPS RESEARCH （ 影响因子：6.4； 五年影响因子：6.6 ）

ISSN： 0378-4290

年卷期： 2025 年 331 卷

页码：

收录情况： SCI

摘要： Context: Enhancing nitrogen use efficiency (NUE) is a promising strategy to mitigate nitrogen losses, including those from NH3 volatilization. Research question: Both NH3 volatilization and NUE are influenced by variables such as soil properties, fertilization practices, and rice varieties. However, the interplay of these factors may complicate the trade-off between NUE and paddy NH3 volatilization. Methods: To bridge this knowledge gap, we quantified the correlation between NUE and NH3 volatilization in paddies, along with the key factors influencing both, by integrating the results from a meta-analysis and a 2-year field experiment. Results: The meta-analysis revealed that the fertilization effect on NH3 volatilization was remarkably correlated with NUE and N application rate. NH3 volatilization exhibited a significant negative linear relationship with NUE (y =- 0.0238x + 2.6804, P < 0.001) and a positive linear relationship with N application rate (y = 0.006x + 2.6028, P < 0.001). Interestingly, subset analysis showed that the fertilization effect was unaffected by all predictors at low N application rate (<= 150 kg/ha), but was influenced by both soil pH and the type of N fertilizer at high rate (>= 250 kg/ha). The field experiments confirmed a trade-off between NH3 volatilization and NUE. Importantly, NH3 volatilization was significantly negatively correlated with N absorption only during the tillering stage (y =-0.68x + 0.779, P < 0.001), with no such correlation at other stages. Moreover, NH3 volatilization during the tillering stage showed a significant negative correlation with amount of root bleeding sap (y =-0.71x + 0.814, P < 0.01) and leaf area index (y =-0.61x + 0.672, P < 0.05). The leaf angle of functional leaves was significantly positively correlated with N absorption, amount of root bleeding sap, and leaf area index, which are closely related to NH3 volatilization. Conclusions: NUE exhibited a clear trade-off with paddy NH3 volatilization, predominantly driven by N absorption capacity during the tillering stage. The leaf angle of functional leaves emerged as a key factor influencing indicators related to NH3 volatilization, including N absorption capacity, amount of root bleeding sap, and leaf area index. Implications or significance: These findings provide new insights into the relationship between NUE and NH3 volatilization, offering theoretical support for reducing NH3 volatilization in paddies by enhancing NUE in rice production.

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