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[1]ZHOU Xiao-hong,WANG Guo-xiang,YANG Fei,et al.Uptake Kinetic Characteristics of Different Ammonium and Nitrate by Ipomoea aquatica Forsk[J].Research of Soil and Water Conservation,2008,15(05):84-87.

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Uptake Kinetic Characteristics of Different Ammonium and Nitrate by Ipomoea aquatica Forsk

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 15 Number of periods: 2008 05 Page number: 84-87 Column: Public date: 2008-10-20

Title:: Uptake Kinetic Characteristics of Different Ammonium and Nitrate by Ipomoea aquatica Forsk

Author(s):: ZHOU Xiao-hong, WANG Guo-xiang, YANG Fei, HE Wei, YANG Zhou; Jiangsu Key Laboratory of Environmental Change and Ecological Construction, College of Geographical Science, Nanjing Normal University, Nanjing 210046, China

Keywords:: uptake kinetics; Nitrogen; form; Ipomoea aquatica Forsk

CLC:: S601;S636.9

DOI:: -

Abstract:: The uptake Kinetic characteristics of different ammonium and nitrate by Iponoea aquatica Forsk was researched. The results showed that ①The Km value of ammonium uptake was less than that of nitrate uptake by Ipomoea aquatica Forsk (K_{m ammonium}_{m nitrate), Which indicated that the Ipomoea aquatica Forsk preferential uptake and clean up ammonium and reflected the cleaning degree would be higher in the enough retention time. ②The maximum rate of ammonium uptake by Ipomoea aquatica Forsk was larger than that of nitrate uptake and the maximum rate of ammonium was 0.001 85 mmol/ (g·FW·h) and the maximum rate of nitrate was 0.000 279 mmol/ (g·FW·h), which indicated that the purification rate of the ammonium was bigger than nitrate. ③The Km of nitrate uptake increased 2.5% and the maximum rate of nitrate decreases 34% with the existence of NH₄⁺ and the uptake ability decreased, which indicated that the Km between the carrier of cell membrane and the nitrate of Ipomoea aquatica Forsk would not been affected, but the operation speed would been influenced with the existence of NH₄⁺.}

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