Mật độ và tiềm năng phản nitrat hóa của hệ vi sinh vật bản địa trong rừng ngập mặn (RNM) và thảm cỏ biển (TCB) ven biển phía bắc Việt Nam được đánh giá thông qua 02 hệ sinh thái RNM ở khu vực Tiên Yên - Quảng Ninh và Bàng La - Hải Phòng và 03 hệ sinh thái TCB ở khu vực Hà Cối và Đầm Hà - Quảng Ninh và Tam Giang - Thừa Thiên Huế. | Vietnam Journal of Marine Science and Technology Vol. 21 No. 2 2021 223 232 DOI https 1859-3097 16406 https jmst Density and de-nitrifying potential of indigenous bacterial assemblage in mangrove and seagrass in the North of Vietnam Le Thanh Huyen1 Dao Thi Anh Tuyet2 Le Minh Hiep2 Nguyen Tien Dat2 Ha Thi Binh2 Do Trung Sy3 Do Manh Hao1 2 1 Graduate University of Science and Technology VAST Vietnam 2 Institute of Marine Environment and Resources VAST Vietnam 3 Institute of Chemistry VAST Vietnam E-mail haodm@ Received 28 October 2020 Accepted 9 January 2021 2021 Vietnam Academy of Science and Technology VAST 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 102 103 MPN mL averaging 103 MPN mL. The density in mangroves was higher than that in seagrass . De-nitrification rates ranged from µgN wet to µgN wet soil g hour averaging µgN wet soil g hour. The rate at the experiments added 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. Keywords De-nitrifying bacteria de-nitrification rate mangrove seagrass bed environmental factor north of Vietnam. Citation Le Thanh Huyen Dao Thi Anh Tuyet Le Minh Hiep Nguyen Tien Dat Ha Thi Binh Do Trung Sy Do Manh Hao 2021. Density and de-nitrifying potential of indigenous bacterial assemblage in mangrove and .
