Gap Regeneration Patterns Of Woody Tree Species In Tropical Evergreen Moist Forest At The Ba Vi National Park

MINISTRY OF AGRICULTURE AND RURAL DEVELOPMENT

VIETNAM FORESTRY UNIVERSITY

STUDENT THESIS

GAP REGENERATION PATTERNS OF WOODY TREE SPECIES IN

TROPICAL EVERGREEN MOIST FOREST AT THE BA VI

NATIONAL PARK

Major: Natural Resources Management (Advanced Curriculum)

Code: D850101

Faculty: Forest Resources And Environmental Management

Student: Nguyen Thi Nham Student ID: 1053090440

Class: K55 Natural Resource Management Course: 2010 - 2014

Advanced Education Program

Developed in collaboration with Colorado State University, USA

Supervisor: Dr. Pham Minh Toai

i

Hanoi, November 2014

ACKNOWLEDGEMENTS

To complete this report, my research has received a lot of support from

organizations and individuals involved. Firstly, I would like to send my most sincere

thanks to Dr. Pham Minh Toai - Lecturer of Silviculture Faculty - Vietnam Forest

University who has dedicated guides and helps me throughout the implementation process

of research.

I also sincerely thank the cooperation and help of the leadership and staffs in Ba Vi

National Park. Thanks for help of friends in the days of data collection in the field.

Although I was tried by my best to implement this study, but my knowledge,

duration of the study and references are limited, so that the research inevitably flawed. I

look forward to receiving comments from teachers, friends and all readers for completing

this research.

I sincerely thank you all!

Author

Nguyen Thi Nham

TABLE OF CONTENT

I. INTRODUCTION..............................................................................................................1

II. OVERVIEW OF THE RESEARCH AREA.....................................................................4

III. STUDY OBJECTIVES....................................................................................................6

IV. STUDY METHODS........................................................................................................7

4.1. Data collection methods..............................................................................................7

4.1.1. Selection of the study areas..................................................................................7

4.1.2. Gap sampling........................................................................................................7

4.2. Data analysis methods...............................................................................................10

V. RESULTS AND DISCUSSIONS...................................................................................12

5.1. Gap characteristics and size class distributions ........................................................12

5.2. Characteristics of regeneration in the gaps ...............................................................14

5.2.1. Growth characteristics of canopy tree surrounding studied gaps.......................14

5.2.2. Density and tree species composition in the gaps ..............................................15

5.2.3. Height distribution of regenerated trees .............................................................17

5.2.4. Density and quality of regenerated trees ............................................................20

5.3. Effect of factors to gap regeneration.........................................................................23

5.3.1. Effect of under the forest canopy in around gap to gap regeneration................23

5.3.2. Effect of shrubs and vegetation to gap regeneration ..........................................24

5.4. Recommend some silvicultural solutions to promote restoration process of forest

gaps at the study area .......................................................................................................26

VI. CONCLUSIONS AND RECOMMENDATIONS........................................................28

6.1. Conclusions...............................................................................................................28

6.2. Recommendations.....................................................................................................29

LIST OF FIGURE

Figure 2.1: Map of Forest Statuses in Ba Vi National Park ..................................................5

Figure 4.1: Gap area measurement and sample plot design ..................................................8

Figure 5.1: The size class distributions of canopy gap ........................................................13

Figure 5.2: Distribution of regenerated trees in poor forest ................................................18

Figure 5.3: Distribution of regenerated trees in medium forest...........................................18

Figure 5.4: Distribution of regenerated trees in rich forest..................................................19

Figure 5.5: Quality of regeneration tree in poor forest ........................................................21

Figure 5.6: Quality of regeneration tree in medium forest ..................................................22

Figure 5.7: Quality of regeneration tree in rich forest .........................................................22

LIST OF TABLE

Table 5.1: Gap characteristics of the three forest categories...............................................12

Table 5.2: Characteristics of surrounding canopy trees in the gaps ....................................14

Table 5.3: Species compositions of regeneration tree in the gaps......................................15

Table 5.4: Distribution of regenerated trees according their height ....................................17

Table 5.5: Density of seedlings and saplings in studied areas.............................................20

Table 5.6: Distribution of regenerated tree according the quality .......................................21

Table 5.7: Relations between the high tree composition and regeneration tree ..................23

Table 5.8: Effect of shrubs and vegetation to regeneration ................................................25