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[Phosphorus and sulphur bio-cycling in alpine tundra ecosystem of Changbai Mountains].

The study with compartment model on the phosphorus (P) and sulphur (S) bio-cycling in alpine tundra ecosystem of Changbai Mountains showed that the total storage of P and S was 16 088.6 t and 26 079.4 t, of which, 46.14 t and 64.82 t was in vegetation pool, 89.63 t and 53.16 t in litterfall pool, and 15952.8 t and 26014.6 t in soil pool, respectively. The above- and below-ground vegetation pool stored 21.88 t and 44.21 t, and 24.28 t and 20.61 t of P and S, respectively, and the above-ground vegetation pool had 47.4% of P and 68.2% of S in the vegetation subsystem. The transferable P amount was 24.25 t x yr(-1) through plant absorption and 31.59 t x yr(-1) through litterfall return, while the transferable S amount was 31.18 t x yr(-1), 10.12 t x yr(-1) and 21.06 t x yr(-1) in the aboveground plant, belowground root system, and litterfall return, respectively. The natural return ratio of S was 67.5%.