Density and de-nitrifying potential of indigenous bacterial assemblage in mangrove and seagrass in the north of Vietnam

Authors

  • Le Thanh Huyen Graduate University of Science and Technology, VAST, Vietnam
  • Dao Thi Anh Tuyet Institute of Marine Environment and Resources, VAST, Vietnam
  • Le Minh Hiep Institute of Marine Environment and Resources, VAST, Vietnam
  • Nguyen Tien Dat Institute of Marine Environment and Resources, VAST, Vietnam
  • Ha Thi Binh Institute of Marine Environment and Resources, VAST, Vietnam
  • Do Trung Sy Institute of Chemistry, VAST, Vietnam
  • Do Manh Hao Graduate University of Science and Technology, VAST, Vietnam; Institute of Marine Environment and Resources, VAST, Vietnam

DOI:

https://doi.org/10.15625/1859-3097/16406

Keywords:

De-nitrifying bacteria, de-nitrification rate, mangrove, seagrass bed, environmental factor, north of Vietnam.

Abstract

This study assessed the density and de-nitrification potential of indigenous microorganisms in mangroves and seagrass beds in northern Vietnam through two mangrove ecosystems in Tien Yen - Quang Ninh and Bang La - Hai Phong and three seagrass beds in Ha Coi and Dam Ha - Quang Ninh and Tam Giang - Thua Thien Hue. The analysis results of 4 sampling times in rainy and dry seasons during 2017–2019 showed that the density of de-nitrifying bacteria ranged from (1.0 × 102)–(4.6 × 103) MPN/ml, averaging 1.1 ± 0.3 × 103 MPN/ml. The density in mangroves was higher than that in seagrass (a = 0.05). De-nitrification rates ranged from 0.0 µgN/wet to 69.0 µgN/wet soil g/hour, averaging 18.4 ± 7.4 µgN/wet soil g/hour. The rate at the experiments added 0.5 mgN/l in seagrass was higher than that in the mangrove. The density and rate of de-nitrification were significantly correlated with many environmental factors, especially density of sulfur-oxidizing bacteria, the density of nitrifying bacteria, pH, Eh, Nts, N-NH4, P- PO4 and BOD5.

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Published

2021-06-30

How to Cite

Le Thanh, H., Dao Thi , A. T., Le Minh, H., Nguyen Tien, D., Ha Thi , B., Do Trung , S., & Do Manh, H. (2021). Density and de-nitrifying potential of indigenous bacterial assemblage in mangrove and seagrass in the north of Vietnam. Vietnam Journal of Marine Science and Technology, 21(2). https://doi.org/10.15625/1859-3097/16406

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Articles