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<p>Phosphorus (P) is a critical yet often limited macronutrient in plant nutrition due to its complex chemistry and restricted bioavailability in soils. This study investigated the P status and (de)sorption kinetics in arid salt-affected soils along a 40&#xa0;km transect in the Al-Batinah region of Oman, extending from the coast to the mountains (altitude range: 5–334&#xa0;m above mean sea level (mamsl)). Soil samples were characterized, and P lability and desorption kinetics were assessed using a combination of diffusive gradients in thin films (DGT), diffusive equilibrium in thin films (DET), and the DIFS model. Coastal soils exhibited the highest P levels, with Olsen-P and water-soluble P averaging 53 and 2.4&#xa0;mg kg<sup>− 1</sup>, respectively, compared to 29 and 0.97&#xa0;mg kg<sup>− 1</sup> at altitudes above 100 mamsl. Soil solution P (DET) and DGT-labile P concentrations were also highest at the coastal sites. Desorption kinetic parameters and the relative contribution of desorption to soil solution P replenishment after DGT-induced depletion were strongly correlated with calcium carbonate (CaCO<sub>3</sub>) concentrations, highlighting CaCO<sub>3</sub> as the main driver of P bioavailability in these soils. This study extends the application of DGT/DET-DIFS methodology and indicates that P bioavailability in the surveyed soils is largely governed by adsorption on CaCO<sub>3</sub> precipitates, rather than by organic colloids or aluminosilicates. Despite the elevated coastal soil salinity, its impact on P desorption kinetics or bioavailability appeared negligible. These findings offer insights into P dynamics in arid salt-affected soils.</p> Graphical Abstract <p></p>

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Phosphorus Lability and Desorption Kinetics Across a Traditional Date Palm Soil Catena in Oman

  • 期刊论文

  • 发表日期：

    2025年1月20日

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  • Mansour Al-Haddabi,
  • Daniel Blackburn,
  • Kamel M. Eltohamy,
  • Dong-Xing Guan,
  • Gang Li,
  • Buthaina Al-Siyabi,
  • Ayman Al-Syiabi,
  • Malik Al-Wahaibi,
  • Said Al-Ismaily

摘要

Phosphorus (P) is a critical yet often limited macronutrient in plant nutrition due to its complex chemistry and restricted bioavailability in soils. This study investigated the P status and (de)sorption kinetics in arid salt-affected soils along a 40 km transect in the Al-Batinah region of Oman, extending from the coast to the mountains (altitude range: 5–334 m above mean sea level (mamsl)). Soil samples were characterized, and P lability and desorption kinetics were assessed using a combination of diffusive gradients in thin films (DGT), diffusive equilibrium in thin films (DET), and the DIFS model. Coastal soils exhibited the highest P levels, with Olsen-P and water-soluble P averaging 53 and 2.4 mg kg− 1, respectively, compared to 29 and 0.97 mg kg− 1 at altitudes above 100 mamsl. Soil solution P (DET) and DGT-labile P concentrations were also highest at the coastal sites. Desorption kinetic parameters and the relative contribution of desorption to soil solution P replenishment after DGT-induced depletion were strongly correlated with calcium carbonate (CaCO3) concentrations, highlighting CaCO3 as the main driver of P bioavailability in these soils. This study extends the application of DGT/DET-DIFS methodology and indicates that P bioavailability in the surveyed soils is largely governed by adsorption on CaCO3 precipitates, rather than by organic colloids or aluminosilicates. Despite the elevated coastal soil salinity, its impact on P desorption kinetics or bioavailability appeared negligible. These findings offer insights into P dynamics in arid salt-affected soils.

Graphical Abstract