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

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

doi:10.15625/1859-3097/16406

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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

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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