Land reclamation increased labile and moderately labile P fractions and strengthened co‐occurrence network of <i>gcd</i> community in calcareous soils

Abstract Land reclamation significantly impacts the transformation and availability of phosphorus (P) in soils. P‐solubilizing microorganisms (PSMs) play key roles activating soil P. However, responses PSMs to buildup P under land relationship between different fractions have not been clearly clarified. Here, an investigation was carried out containing three treatments: (i) vegetable field (VF), (ii) cropland (CF), (iii) uncultivated (UL). Different were measured; abundance stable oxygen isotope phosphate D.HCl‐Pi determined. The diversity, composition, co‐occurrence network glucose dehydrogenase community ( gcd ) analyzed. Compared with UL treatment, total treatments VF CF increased by 1.5 1.2 times, respectively. proportions labile moderately 151% 58% higher than treatment. α‐diversity (i.e., Shannon Chao1 indices) greater change structure closely associated resin‐Pi, NaHCO 3 ‐Pi, NaOH‐Pi. nodes edges networks Overall, a substantial amount accumulated after reclamation, which more pronounced non‐labile P; complexity robustness community's notably strengthened reclamation.