Nitrogen-salt interaction in Pennisetum giganteum: Effects on soil, rhizosphere, and ion transport processes

文献类型： 外文期刊

第一作者： Wang, Peng

作者： Wang, Peng;Zhang, Chen;Li, Wenyu;Guo, Junkang;Li, Yongtao;Pei, Xu;Li, Wenyan;Zhang, Zhen;Li, Yongtao;Woon, Kok Sin;Liu, Mengxue;Zhang, Zhen;Liu, Mengxue;Zhang, Zhen;Zhang, Kun;Woon, Kok Sin

作者机构：

关键词： Nitrogen-salt interaction; Pennisetum giganteum; Nitrogen transformation; Rhizosphere microbial community; Ion transport

期刊名称：APPLIED SOIL ECOLOGY （ 影响因子：5.0； 五年影响因子：5.4 ）

ISSN： 0929-1393

年卷期： 2025 年 214 卷

页码：

收录情况： SCI

摘要： The continuous expansion of soil salinization poses challenges to agricultural development. Nitrogen (N), the most commonly used fertilizer, helps alleviate salt stress either at appropriate concentrations or through N assimilation. Fertilization management is crucial for plant survival and saline soil quality. Although the individual effects of N and salt have been widely studied, their combined impact on Pennisetum giganteum (P. giganteum) remains insufficiently explored. In this study, laboratory and field experiments were combined to investigate changes in soil N transformation, salt ion transport in P. giganteum, and the effects of N-salt interaction on the rhizosphere microbial community (RMC). The results indicated that N-salt interaction increased P. giganteum height and yield by 50.80 % and 67.23 %, respectively. The structural equation model indicated that N uptake had the most significant effect on yield (path coefficient = 0.963), with NO3--N positively affecting N uptake. NO3--N was more strongly correlated with height and yield than NH4+-N. 16S sequencing, principal coordinate analysis, and redundancy analysis revealed that denitrifying genera (e.g., Dechloromonas) decreased significantly under high-level N-salt interaction, while nitrification-related genera (e.g., Nitrospira) increased, thereby generating more NO3--N to promote P. giganteum growth. Soil electrical conductivity was the key factor affecting the RMC at the tillering stage. Additionally, P. giganteum may adapt to different salinity levels through distinct salt tolerance mechanisms. This study confirmed that N alleviates salt stress, and revealed the mechanisms of N transformation in the rhizosphere microenvironment and the transport of salt ions in P. giganteum under N-salt interaction.

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