tailieunhanh - Summary of Biology doctoral thesis: Study on structural dynamics of the evergreen broadleaf forest in Hang Kia - Pa Co Nature Reserve and Xuan Son National Park

General objective: To contribute to understanding the rules and structural dynamics of evergreen broadleaf natural forests as a basis for proposing some solutions for sustainable forest management. | MINISTRY OF EDUCATION VIETNAM ACADEMY AND TRAINING OF SCIENCE AND TECHNOLOGY GRADUATE UNIVERSITY SCIENCE AND TECHNOLOGY ----------------------------- Nguyen Tien Dung STUDY ON STRUCTURAL DYNAMICS OF THE EVERGREEN BROADLEAF FOREST IN HANG KIA - PA CO NATURE RESERVE AND XUAN SON NATIONAL PARK Major Ecology Code 9 42 01 20 SUMMARY OF BIOLOGY DOCTORAL THESIS HA NOI - 2020 The thesis was completed at Graduate University of Science and Technology - Vietnam Academy of Science and Technology. Supervisors 1. Assoc. Prof. Dr. Tran Van Con 2. Assoc. Prof. Dr. Nguyen Van Sinh Reviewer 1 Reviewer 2 Reviewer 3 The thesis will be presented in front of the doctoral thesis council at Graduate University of Science and Technology - Vietnam Academy of Science and Technology- 18 Hoang Quoc Viet Road Cau Giay Hanoi. At time . The thesis can be found at - Library of Academy of Science and Technology - National Library of Vietnam INTRODUCTION 1. The urgency of the thesis Forests play an important role to regulate the climate maintain the ecological environment preserve and regulate water sources protect soil against erosion and prevent and minimize natural disasters. In Vietnam forest area has changed dramatically over time. In 1943 the forest area in Vietnam was million ha coverage reached 43 however by 1990 the forest area was severely reduced to million ha coverage reached in the years 1980 - 1990 on average our country lost 100 000 ha of forest each year. Since 1995 thanks to the great efforts of the State and Government of Vietnam the forest area has increased to million ha with the national coverage reaching . However the quality of the natural forest is currently low and continues to decline in timber volume and biodiversity. Deterioration of forest quality leads to a decline in the role of forests in people s lives. Natural disasters continuously occur and severely affect lives of people. The forestry basis for sustainable forest management includes .