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


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.


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

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