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Purpose <p>The phosphorus saturation degree (DPS) of soil is a critical indicator of P release risk, its role in regulating colloidal phosphorus (P<sub>coll</sub>) dynamics under saturated conditions remains unclear. This study investigates how progressive DPS elevation influences P<sub>coll</sub> concentration, water-dispersible colloids (WDCs) release, and colloidal microstructure in Ultisol, aiming to elucidate the P mobility mechanisms and inform sustainable P management in paddy systems.</p> Methods <p>The release kinetics, colloidal P content, mineral composition, surface morphology, and stability-mobility of soil WDCs in Ultisol were systematically characterized across DPS gradients (26–47%).</p> Results <p>WDCs in Ultisol transitioned from lamellar to granular structures with increasing DPS, accompanied by mineralogical shifts. WDCs release was positively correlated with pH and soil P storage capacity (SPSC), but negatively with total P (TP), water-soluble P (CaCl<sub>2</sub>-P), amorphous aluminum oxides (Al<sub>o</sub>), DPS and P<sub>coll</sub>.</p> Conclusions <p>This study suggests that higher levels of DPS lead to an increase in P<sub>coll</sub>, but concurrently result in a decreased WDCs release due to ionic strength and pH-induced flocculation. Notably, P loss under saturated conditions shifts from colloid-facilitated transport to dissolved phosphorus leaching. These findings provide insights into the relationship between DPS and P<sub>coll</sub> behavior in Ultisol, but further studies using diverse soils are necessary to validate broader applicability.</p>

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Unraveling the link between soil phosphorus saturation and colloid behavior in ultisol: a case study

  • 期刊论文

  • 发表日期：

    2025年5月30日

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  • Jiamin Zhang,
  • Yanling Wang,
  • Lei Gao,
  • Zhuoling Liu,
  • Evgenios Agathokleous

摘要

Purpose

The phosphorus saturation degree (DPS) of soil is a critical indicator of P release risk, its role in regulating colloidal phosphorus (Pcoll) dynamics under saturated conditions remains unclear. This study investigates how progressive DPS elevation influences Pcoll concentration, water-dispersible colloids (WDCs) release, and colloidal microstructure in Ultisol, aiming to elucidate the P mobility mechanisms and inform sustainable P management in paddy systems.

Methods

The release kinetics, colloidal P content, mineral composition, surface morphology, and stability-mobility of soil WDCs in Ultisol were systematically characterized across DPS gradients (26–47%).

Results

WDCs in Ultisol transitioned from lamellar to granular structures with increasing DPS, accompanied by mineralogical shifts. WDCs release was positively correlated with pH and soil P storage capacity (SPSC), but negatively with total P (TP), water-soluble P (CaCl2-P), amorphous aluminum oxides (Alo), DPS and Pcoll.

Conclusions

This study suggests that higher levels of DPS lead to an increase in Pcoll, but concurrently result in a decreased WDCs release due to ionic strength and pH-induced flocculation. Notably, P loss under saturated conditions shifts from colloid-facilitated transport to dissolved phosphorus leaching. These findings provide insights into the relationship between DPS and Pcoll behavior in Ultisol, but further studies using diverse soils are necessary to validate broader applicability.