Phosphorus composition of upland soils polluted by long-term atmospheric nitrogen deposition

摘要: Atmospheric N deposition can enhance biological P limitation in terrestrial ecosystems and increase the importance of organic to plants microorganisms. We used NaOH–EDTA extraction solution 31P NMR spectroscopy determine composition soils Upper Teesdale National Nature Reserve, northern England, an upland region influenced by such for at least 150 years. Three characteristic soil types were sampled on three occasions during annual cycle: blanket peat (318 mg g−1 total C, 607 μg P, pH 3.9); acid under grassland (354 1190 3.7); calcareous (140 649 7.3). Between 58 99% litter layers was extracted 0.25 M NaOH + 0.05 EDTA. Extracts all dominated mainly form orthophosphate monoesters (43–69% P). The two acidic also contained large proportions diesters (6–19% P) phosphonates (7–16% P), suggesting that these compounds become stabilised low pH. However, a seasonal trend increasing monoester-to-diester ratios, most evident soil, indicated preferential degradation growing season. Orthophosphate major inorganic compound (17–34% pyrophosphate (1–5% determined extracts substantially greater than molybdate colourimetry, occurred complexes with humic not detected conventional procedures. Our results suggest organisms able use recalcitrant may have competitive advantage environments enhanced atmospheric deposition.