Summary
In this study, we conduct a spatial analysis of soil total phosphorus (TP), acid extractable phosphate (PO<sub>4</sub>) and the stable oxygen (O) isotope ratio within the PO<sub>4</sub> molecule (δ<sup>18</sup>O<sub>PO<sub>4</sub></sub> ) from an intensively managed agricultural grassland site. Total P in the soil was found to range from 736 to 1952 mg P kg<sup>- 1</sup>, of which between 12 and 48% was extractable using a 1 M HCl (HCl<sub>PO<sub>4</sub></sub> ) solution with the two variables exhibiting a strong positive correlation. The δ<sup>18</sup>O<sub>PO<sub>4</sub></sub> of the extracted PO<sub>4</sub> ranged from 17.0 to 21.6‰ with a mean of 18.8‰ (± 0.8). While the spatial variability of Total P has been researched at various scales, this is the first study to assess the variabil
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