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ISSN : 2287-8327

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Vol.28 No.2
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Change in forms of Nitrogen and Phosphorus in Sediment by Growth of Zizania latifolia

Journal of Ecology and Environment / Journal of Ecology and Environment, (P)2287-8327; (E)2288-1220
2005, v.28 no.2, pp.93-98



& (2005). Change in forms of Nitrogen and Phosphorus in Sediment by Growth of Zizania latifolia. Journal of Ecology and Environment, 28(2), 93-98.
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Abstract

The effects of the presence of a submerged plant, Zizania latifolia, on physico-chemical characteristics,including Eh, pH, and concentrations of nitrogen and phosphorus in the sediments were studied under pot culture condition. It was shown that Eh value at reduced layer of the sediments was higher in the planted pots than in the non-planted. It was also revealed that NH4 +-N concentration of the sediments in the planted pots was lower than that of the non-planted, which might be due to the uptake by the plants. In contrast, NO3 —-N concentration in the sediment increased in the presence of the plants compared to the non-planted, which might be attributed to oxygen released from the roots to the reduced layer. The concentration of organic phosphorus in the sediments was much higher than that of NAIP at the beginning of the planting experiment. However, at the end of the experiment, it was reversed; NAIP concentration was much higher than that of organic phosphorus, possibly indicating the transformation of organic phosphorus to NAIP during the experimental period. Both concentrations of NH4 +-N and PO4 3—-P in the overlying and percolated water were lower in the planted pots than in the non-planted. The concentration of NO3 --N in the percolated water, however, was higher in the planted pots than in the non-planted. The data was discussed with regard to the potential effects of a submerged plant on dynamics of phosphorus and nitrogen in the rhizosphere of the sediment.

keywords
Nitrogen, Oxidation, Phosphorus rhizosphere, Sediment, Zizania latifolia

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