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Table 2 Total P (TP E ) and organic P (OP E ) in soil extracts (mg kg −1 ) and relative distribution of P

From: Optimized procedure for the determination of P species in soil by liquid-state 31P-NMR spectroscopy

P species Phos-P Orth-P Monoesters PL DNA Diesters a Pyro-P Poly-P OP E TP E
ppm intervals 18 to 24 5.6 5.3 to 3.3 1.6 to −0.3 0.8 −1.1 to −1.6 −4.6 −19 to −21   
Farmland soil
Freeze-drying 0.5 116.7 14.7 0.6 1.0 1.6 0.2 0.1 16.8 133.8
Air-drying ND 106.1 7.8 0.5 0.3 0.9 0.2 0.1 8.8 115.1
Fresh 1.4 98.7 8.4 0.9 0.3 1.1 0.2 0.1 11.0 109.9
Farmland soil added with compost
Freeze-drying 0.5 160.3 16.0 1.7 1.4 3.2 0.4 0.2 19.9 180.7
Air-drying 0.5 153.7 8.6 0.3 0.2 0.4 0.1 0.7 10.3 164.1
Fresh 0.3 153.8 12.8 1.6 0.6 2.2 0.8 0.7 16.0 170.5
Forest soil
Freeze-drying 4.1 172.0 74.8 3.0 2.5 5.5 0.9 0.4 84.9 257.9
Air-drying 4.5 159.1 70.7 2.0 2.1 4.1 1.0 0.2 79.5 239.7
Fresh 5.2 127.8 52.7 1.2 ND 1.2 ND 2.0 61.1 188.9
Forest litter
Freeze-drying 8.1 38.6 80.3 2.6 6.7 9.4 2.5 1.4 97.1 140.2
Air-drying 7.8 31.0 83.4 1.9 6.0 7.9 2.5 ND 99.1 132.7
Fresh 3.3 46.2 80.6 2.1 4.9 7.0 1.2 1.0 91.9 139.4
  1. Species in 31P-NMR spectra acquired for 15 h, as referred to TPE and expressed in milligrams per kilograms. Phos-P, phosphonates; Ortho-P, orthophosphate; Mono-esters, orthophosphate monoesters; PL, phospholipids; Diesters, orthophosphate diesters; Pyro-P, pyrophosphate; Poly-P, polyphosphate; OPE, organic phosphorus in extracts; TPE, total phosphorus in extracts; ND, not detected. aExtracted orthophosphate diesters were calculated by the sum of phospholipids and DNA.