A dual isotopic (32P and 18O) incubation study to disentangle mechanisms controlling phosphorus cycling in soils from a climatic gradient (Kohala, Hawaii)

Summary

This incubation study employed dual stable isotope labelling (32P and 18O) to elucidate the mechanisms controlling phosphorus cycling in soils developed under contrasting climatic conditions along the Kohala volcanic gradient in Hawaii. By tracking phosphorus transformations and mobilisation pathways, the research as suggested by the title aimed to disentangle how climate-driven differences in soil development and weathering stage influence the biogeochemical processes governing phosphorus availability. The findings contribute to understanding how soil age and climate shape phosphorus cycling efficiency and plant-available phosphorus supply.

UK applicability

The mechanisms elucidated in Hawaiian volcanic soils may have limited direct applicability to UK temperate soils, which differ substantially in parent material, weathering regime, and climate. However, the isotopic methodology and conceptual framework for understanding phosphorus cycling mechanisms could inform research on phosphorus availability and cycling efficiency in UK agricultural and natural soils.

Key measures

Isotopic tracer uptake and transformation; phosphorus cycling rates; phosphorus pool sizes and fluxes; soil biochemical properties along the Kohala climate gradient

Outcomes reported

The study used dual stable isotope labelling (32P and 18O) in an incubation experiment to quantify phosphorus cycling pathways and mechanisms in soils along a climatic gradient. The research measured rates and mechanisms of phosphorus mobilisation, transformation, and cycling as influenced by soil development stage and climate conditions.

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