Density and nitrifying potential of indigenous bacterial community in mangrove and seagrass in the north of Vietnam

Le Thanh Huyen; Dao Thi Anh Tuyet; Le Minh Hiep; Nguyen Tien Dat; Ha Thi Binh; Do Trung Sy; Do Manh Hao

doi:10.15625/1859-3097/15787

Author affiliations

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/10.15625/1859-3097/15787

Keywords:

Nitrifying bacteria, density, speed, mangrove forest, seagrass beds, north of Vietnam.

Abstract

Density and nitrification potential of indigenous microorganism in mangroves (Tien Yen - Quang Ninh and Bang La - Hai Phong) and seagrass (Ha Coi, Dam Ha - Quang Ninh and Tam Giang - Thua Thien Hue) in the north of Vietnam were evaluated through 4 sampling times in the dry and rainy seasons in the years of 2017-2019. The analytical results showed that the average density of nitrifying bacteria was 4.6 ± 1.8 × 10² MPN/ml, in which the density in mangroves tended to be higher than that in the seagrass beds (P < 0.05) in both the rainy and dry seasons. The average nitrifying rate was 2.7 ± 0.6 µgN/g wet soil/hour, in which the rate in mangroves tended to be higher than that in seagrass beds in the rainy season (P < 0.05). Nitrifying density and rate are not only correlated with substrate concentration but also with other environmental factors such as P-PO₄, BOD₅, total phosphate in sediment and total bacterial density.

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