Soil phosphorus availability modulates root exudation under long-term nitrogen fertilization

IF 6.1 1区农林科学 Q1 SOIL SCIENCE

Soil & Tillage Research Pub Date : 2025-06-12 DOI:10.1016/j.still.2025.106699

Zheng Jiang , Cong Wang , Huifeng Sun , Xianxian Zhang , Jining Zhang , Liuming Hai , Sheng Zhou

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引用次数: 0

Abstract

Root carbon (C) investment in exchange for phosphorus (P) is a pivotal nutrient acquisition strategy that profoundly impacts soil biogeochemical processes and maintains the functional stability of rice paddy ecosystems. However, the response patterns of C cost-P benefit strategies to external nitrogen (N) input in rice paddies remain unclear. Therefore, root C exudation rates were repeatedly measured using an in situ collection method under control, low N (100 kg ha⁻¹), and high N (200 kg ha⁻¹) treatments. Additionally, soil properties and root morphology were analyzed to identify the main factors influencing variations in root exudation. The results showed that root C exudation rates under high N application increased by 55.1 % compared to the control. These differences were primarily linked to N-induced changes in soil P availability, root biomass, root length, root surface area, and root volume. Consequently, understanding the interplay between soil nutrient availability and root exudation is crucial for optimizing fertilization strategies and improving nutrient use efficiency in rice cultivation systems.

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长期施氮条件下土壤磷有效性调节根系渗出

根系碳(C)交换磷(P)是影响土壤生物地球化学过程和维持水稻生态系统功能稳定的关键养分获取策略。然而，稻田碳-磷效益策略对外部氮输入的响应模式尚不清楚。因此，在控制低氮（100 kg ha⁻¹）和高氮（200 kg ha⁻¹）处理下，使用原位收集法反复测量根C渗出率。此外，还分析了土壤性质和根系形态，以确定影响根系分泌物变化的主要因素。结果表明，与对照相比，高施氮处理下根系C渗出速率提高了55.1% %。这些差异主要与n诱导的土壤磷有效性、根系生物量、根长、根表面积和根体积的变化有关。因此，了解土壤养分有效性与根系分泌物之间的相互作用对于优化施肥策略和提高水稻栽培系统的养分利用效率至关重要。

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来源期刊

Soil & Tillage Research 农林科学-土壤科学

CiteScore

13.00

自引率

6.20%

发文量

266

审稿时长

5 months

期刊介绍： Soil & Tillage Research examines the physical, chemical and biological changes in the soil caused by tillage and field traffic. Manuscripts will be considered on aspects of soil science, physics, technology, mechanization and applied engineering for a sustainable balance among productivity, environmental quality and profitability. The following are examples of suitable topics within the scope of the journal of Soil and Tillage Research: The agricultural and biosystems engineering associated with tillage (including no-tillage, reduced-tillage and direct drilling), irrigation and drainage, crops and crop rotations, fertilization, rehabilitation of mine spoils and processes used to modify soils. Soil change effects on establishment and yield of crops, growth of plants and roots, structure and erosion of soil, cycling of carbon and nutrients, greenhouse gas emissions, leaching, runoff and other processes that affect environmental quality. Characterization or modeling of tillage and field traffic responses, soil, climate, or topographic effects, soil deformation processes, tillage tools, traction devices, energy requirements, economics, surface and subsurface water quality effects, tillage effects on weed, pest and disease control, and their interactions.