Rhizosphere microbial carbon utilization stimulates soil phosphorus fraction transformation in response to maize (Zea mays L.) and soybean (Glycine max.) interspecific interactions

IF 4.1 2区农林科学 Q1 AGRONOMY Plant and Soil Pub Date : 2024-10-11 DOI:10.1007/s11104-024-06990-3

Ruixue Wang, Lizhen Su, Dingjin Li, Zikun Yang, Rui Feng, Yi Zheng, Li Tang

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Abstract

Aims

This study aimed to investigate the mechanism of rhizosphere soil microbial carbon (C) source utilization affects phosphorus (P) fraction transformation under root interactions.

Methods

Intercropping pot experiments with maize and soybean were performed. Three root separation methods combined with 50 P mg kg⁻¹ and 150 P mg kg⁻¹ supply levels were used. The effects of root interactions on crop P uptake, rhizosphere soil available P content, the Hedley-P fraction and rhizosphere microbial C source utilization intensity were studied, and the relationships between soil P fractions and microbial C source utilization were explored.

Results

Compared with separation barrier (SB) treatment, no barrier (NB) treatment increased P uptake of maize and soybean, increased the available P content in maize rhizosphere soil, while reduced the proportion of the moderate P fraction in soybean rhizosphere, increased the utilization ratio of microbial active C sources in soybean rhizosphere, but the effect of P levels on these changes differed between plots. Root interactions also increased the positive symbiosis ratio between microbial C metabolism and P fractions in maize rhizosphere. Structural equation modeling (SEM) analysis revealed that microbial C source utilization has the negative influence on non-labile organic P (Po) or moderate Po, ultimately promoted soil P availability.

Conclusions

Maize and soybean root interactions can change microbial C source utilization, thereby promoting the transformation of non-labile Po or moderate Po fraction to available P and subsequently increasing shoot biomass and P uptake. Moreover, the effect mentioned above is closely related to the P supply level.

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根圈微生物碳利用促进土壤磷组分随玉米（Zea mays L.）和大豆（Glycine max.）种间相互作用的转化

目的本研究旨在探讨根际相互作用下根圈土壤微生物碳（C）源利用对磷（P）组分转化的影响机制。方法采用玉米和大豆进行盆栽试验。采用三种根系分离方法，结合 50 P mg kg-1 和 150 P mg kg-1 的供应水平。研究了根系相互作用对作物P吸收、根瘤土壤可利用P含量、Hedley-P组分和根瘤微生物C源利用强度的影响，并探讨了土壤P组分和微生物C源利用之间的关系。结果与分离屏障（SB）处理相比，无屏障（NB）处理增加了玉米和大豆对P的吸收，提高了玉米根圈土壤中可利用P的含量，同时降低了大豆根圈土壤中中等P组分的比例，提高了大豆根圈微生物活性碳源的利用率，但P水平对这些变化的影响在不同地块之间存在差异。根系相互作用也增加了玉米根圈微生物 C 代谢与 P 部分之间的正共生比率。结构方程建模（SEM）分析表明，微生物碳源利用率对非可溶性有机磷（Po）或中等Po有负面影响，最终促进了土壤P的可用性。此外，上述效应与钾供应水平密切相关。

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来源期刊

Plant and Soil 农林科学-农艺学

CiteScore

8.20

自引率

8.20%

发文量

543

审稿时长

2.5 months

期刊介绍： Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.