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.
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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 MINISTRY OF EDUCATION VIETNAM ACADEMY AND TRAINING OF SCIENCE AND TECHNOLOGY GRADUATE UNIVERSITY SCIENCE AND TECHNOLOGY ----------------------------- Nguyen Tien DungSTUDY 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 - 2020The thesis was completed at:Graduate University of Science and Technology - Vietnam Academyof Science and Technology.Supervisors: 1. Assoc. Prof. Dr. Tran Van Con 2. Assoc. Prof. Dr. Nguyen Van SinhReviewer 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 Academyof 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 INTRODUCTION1. The urgency of the thesis Forests play an important role to regulate the climate; maintainthe ecological environment; preserve and regulate water sources;protect soil against erosion; and prevent and minimize naturaldisasters. In Vietnam, forest area has changed dramatically overtime. In 1943, the forest area in Vietnam was 14.1 million ha(coverage reached 43%); however, by 1990 the forest area wasseverely reduced to 9.18 million ha (coverage reached 27.2%); in theyears 1980 - 1990, on average, our country lost 100,000 ha of foresteach year. Since 1995, thanks to the great efforts of the State andGovernment of Vietnam, the forest area has increased to 14.6 millionha with the national coverage reaching 41.89%. However, the qualityof the natural forest is currently low and continues to decline intimber volume and biodiversity. Deterioration of forest quality leadsto a decline in the role of forests in peoples lives. Natural disasterscontinuously occur and severely affect lives of people.The forestry basis for sustainable forest management includesclassification of natural forests, structural features of natural forests,rules of growth and yield of natural forests, rules of forest successionand regeneration. The dynamics taking place in the forest can bedivided into three groups of processes: (i) tree growth; (ii) additionalregeneration process; and (iii) natural death process in diameterclasses. Information on the growth and regeneration rules of foresttrees should be obtained from long-term observations by positioningplots, by monitoring those rules over the long term. This requiresspecialized knowledge, great time and finance. Up to now, in XuanSon National Park and Hang Kia - Pa Co Nature Reserve, there arevery few studies on the PL of the location of forest dynamics, and nostudies on structural dynamics of forests. For the above reasons, thetopic: Study on structural dynamics of the evergreen broadleaf forestin Hang Kia - Pa Co Nature Reserve and Xuan Son National Parkhas been conducted.2. The study objectives of the thesis - General objective: To contribute to understanding the rulesand structural dynamics of evergreen broadleaf natural forests as abasis for proposing some solutions for sustainable forestmanagement. - Specific objective: To identify some structural characteristicsand forest structural dynamics characteristics in Hang Kia - Pa CoNature Reserve and Xuan Son National Park; and propose somesolutions for sustainable forest management.3. The main study contents of the thesis - Study on forest structure characteristics and species diversity - Study on canopy layer structure dynamics - Study additional regeneration dynamics; and level transitionand death process - Proposed application of study results - Proposal of some solutions for forest management4. Layout of the thesis Introduction: Explaination of the necessity, objectives, andscientific and practical significance of the thesis (3 pages). Chapter 1. Study overview (30 pages). Chapter 2. Subject, scope, content limitation and study method(14 pages). Chapter 3. Characteristics of the study area (10 pages) Chapter 4. Study results and discussion (65) Conclusions and recommendations: presenting conclusionsdrawn from study results, stating existing shortcomings andrecommendations (3 pages). The thesis includes 27 tables and 39 pictures. Refer to 92d ...