Aims

Phosphorus (P) in soil comprises both organic P (OP) and inorganic P (IP), but efficiency of plant P-acquisition strategies for accessing various IP or OP from soil is unclear.

Methods

We examined the response of P-acquisition root traits in eight plant species in the presence of IP or OP sorbed onto various soil minerals.

Results

We highlighted contrasting trait plasticity for three distinct P-acquisition strategies: mining, foraging, and intermediate. Species with mining and foraging P strategies showed significant plasticity in root traits across P-forms. Species with P-mining strategy had greater physiological root traits and P-acquisition from OP, while species with a P-foraging strategy had greater morphological and architectural root traits and P uptake from IP. In contrast, species with intermediate P strategy showed lower trait plasticity among P forms and similar P acquisition from all P forms. Results show that each strategy presented a specific trait combination, with greater degree of P acquisition for the intermediate strategy that combined morphological and physiological traits. Mineral-P interactions also influenced plant strategies, with OP desorbing more from clays (kaolinite) than from Fe/Al oxides.

Conclusions

The present findings highlight the importance of both plasticity and combinations of root traits for each P-acquisition strategy and allow to improve our understanding of P dynamic in the soil-plant system while presenting new knowledges for modelling P acquisition.

中文翻译：

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根系性状组合和可塑性对磷形态的响应对农业生态系统磷吸收的关键作用

 目标

土壤中的磷（P）包括有机磷（OP）和无机磷（IP），但植物从土壤中获取各种IP或OP的磷获取策略的效率尚不清楚。

 方法

我们研究了八种植物在 IP 或 OP 吸附到各种土壤矿物质上时根部吸收磷性状的反应。

 结果

我们强调了三种不同的磷获取策略的对比性状可塑性：采矿、觅食和中间。具有采矿和觅食 P 策略的物种在 P 形式的根性状中表现出显着的可塑性。采用磷开采策略的物种具有更大的生理根特征和从 OP 中获取磷的能力，而采用磷觅食策略的物种则具有更大的形态和结构根特征以及从 IP 中吸收磷的能力。相比之下，采用中间磷策略的物种在磷形式之间表现出较低的性状可塑性，并且从所有磷形式中获得相似的磷。结果表明，每种策略都呈现出特定的性状组合，结合形态和生理性状的中间策略具有更大程度的磷获取程度。矿物-磷相互作用也影响了植物策略，有机磷从粘土（高岭石）中解吸的量多于从铁/铝氧化物中解吸的量。

 结论

目前的研究结果强调了可塑性和根性状组合对于每种磷获取策略的重要性，并有助于提高我们对土壤-植物系统中磷动态的理解，同时为磷获取建模提供新知识。