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Spatial-temporal pattern and source of soil available phosphorus in Minjiang River estuarine wetland.

ZHANG Wen-long1,2,3, ZENG Cong-sheng1,2,3**, CHEN Xiao-yan1, LIN Wei1   

  1. (1School of Geographical Sciences, Fujian Normal Universities, Fuzhou 350007, China; 2Key Laboratory of Humid Subtropical Ecogeographical Process of Ministry of Education, Fuzhou 350007, China; 3 Research Centre of Wetlands in Subtropical Region, Fuzhou 350007, China)
  • Online:2015-01-10 Published:2015-01-10

Abstract: To reveal the spatialtemporal pattern and source of soil available phosphorus (AP) across a subtropical tidal marsh, soil AP, total phosphorus (TP), organic phosphorus (Org-P) and inorganic phosphorus (IP) speciation along a hydrological gradient were examined in Minjiang River estuary of eastern China in May, August and November, 2013. The mean concentrations of soil AP in May (3.53±1.15 mg·kg-1) and August (3.23±1.15 mg·kg-1) were significantly higher than that in November (1.96±1.07 mg·kg-1) (P<0.05). The distribution patterns of soil AP in the three periods were similar, which showed a fluctuant decrease from high tidal marsh to middle tidal marsh and the higher value was observed in Phragmites australis soil compared with that in Cyperus malaccensis soil (P<0.05). Additionally, we observed that soil AP decreased with soil depth in high tidal marsh, while it slightly changed with soil depth in middle tidal marsh. Org-P, iron bound phosphorus (Fe-P) and occluded phosphorus (O-P) were considered as main sources of soil AP in the different vegetation growth periods.

Key words: phenotypic plasticity, dryland wheat, physiological plasticity, artificial selection, evolution