MINISTRY OF EDUCATION AND TRAINING MINISTRY OF AGRICULTURE AND RURAL DEVELOPMENT THUY LOI UNIVERSITY HA THI HIEN QUANTITATIVE STUDY ON CARBON STOCK AND FLUX IN PLANTED MANGROVES AT XUAN THUY NATIONAL PARK Specialization: Soil and water environment Code number: 44 03 03 SUMMARY OF DOCTORAL DISSERTATION HANOI, 2018 This scientific work has been accomplished at Thuyloi University Supervisor: Assoc Prof Dr Nguyen Thi Kim Cuc Reviewer No 1: Assoc Prof Dr Le Xuan Tuan Reviewer No 2: Assoc Prof Dr Pham Minh Toai Reviewer No 3: Assoc Prof Dr Duong Thi Thuy This Doctoral dissertation will be defended at ………………… ……… on date ….………………………………………………………………………… This dissertation is available at: - The National Library - The Library of Thuyloi University INTRODUCTION Rationale of the research Mangroves are vegetation that exist along estuaries and coastlines of (sub)tropical area [1] The mangrove ecosystems protect the coastal zone from natural disasters such as rainstorms, cyclones, waves, floods and tsunami [4], [5] Beside the coastal protection role, mangrove ecosystems provide numerous ecosystem services and other commercial values [6]-[8] In the last few decades, mangrove forests have been recognized as important ecosystems in the carbon cycle The mangrove ecosystem act as a sink for atmospheric CO2, and contribute as source of organic and inorganic carbons in the coastal areas Researches on carbon accumulation in planted mangroves in Northern Vietnam were conducted by Nguyen Thanh Ha, Nguyen Thi Kim Cuc and Nguyen Thi Hong Hanh [10] - [13] The authors calculated carbon stocks in soils and carbon accumulation in biomass of the planted mangroves (Kandelia obovata Sheue, Liu & Yong;