Interactions between ammonium uptake and nitrate uptake by natural phytoplankton assemblages

Jiao Nianzhi

doi:10.1007/BF02850815

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Interactions between ammonium uptake and nitrate uptake by natural phytoplankton assemblages

OriginalPaper | Updated：2023-05-16

- Interactions between ammonium uptake and nitrate uptake by natural phytoplankton assemblages
- Interactions between ammonium uptake and nitrate uptake by natural phytoplankton assemblages
- 海洋湖沼学报（英文） 1993年11卷第2期页码：97-107
- Affiliations：
  
  Institute of Oceanology
- Author bio：
- Funds：
  
  Contribution No. 2174 from the Institute of Oceanology, Academia Sinica.;This study is supported by the National Natural Science Foundation of China (No. 39200022).
- DOI：10.1007/BF02850815
  中图分类号：
- 纸质出版：1993
- Accepted：
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Interactions between ammonium uptake and nitrate uptake by natural phytoplankton assemblages[J]. 海洋湖沼学报（英文）, 1993,11(2):97-107.

Nianzhi, J. Interactions between ammonium uptake and nitrate uptake by natural phytoplankton assemblages., Chin. J. Ocean. Limnol. 11, 97–107 (1993). https://doi.org/10.1007/BF02850815
Interactions between ammonium uptake and nitrate uptake by natural phytoplankton assemblages[J]. 海洋湖沼学报（英文）, 1993,11(2):97-107. DOI： 10.1007/BF02850815.

Nianzhi, J. Interactions between ammonium uptake and nitrate uptake by natural phytoplankton assemblages., Chin. J. Ocean. Limnol. 11, 97–107 (1993). https://doi.org/10.1007/BF02850815 DOI：

摘要

Abstract

Measurements of ammonium and nitrate uptakes by natural phytoplankton assemblages from Jiaozhou Bay at various combinations of ammonium and nitrate concentrations with15N trace techniques showed that uptake rate of either nitrogen was influenced by the presence of the other but that the influence of ammonium on nitrate uptake was much greater than that of nitrate on ammonium uptake. The influence mechanism of ammonium on nitrate uptake manifested as competition at lower concentrations and as inhibition at higher concentrations (ammonium concentration >0.6 μmol/L)

but no total inhibition appeared within the concentration range of the experiments (0–10 μmol/L). The influence of nitrate on ammonium uptake seems to be a result of competition for uptake sites on the cell surface. In view of the in situ nutrient concentration in the given marine environment

it is believed that both nitrogen sources are utilized by phytoplankton. Nitrate uptake in the presence of ammonium and ammonium uptake in the presence of nitrate are expressed by a non-linearly and a linearly calibrated Michaelis-Menten equation respectively. In addition

a non-linearf-ratio model is given which may be useful in practical studies on new production in Jiaozhou Bay.

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references

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