Soil Erosion And Overland Flow Response To Clear Cutting Of Acacia Hybrid Plantation In Headwater Catchment Of Hoa Binh Province

MINISTRY OF AGRICULTURE AND RURAL DEVELOPMENT

VIETNAM NATIONAL UNIVERSITY OF FORESTRY

STUDENT THESIS

SOIL EROSION AND OVERLAND FLOW RESPONSE TO CLEAR

CUTTING OF ACACIA HYBRID PLANTATION IN HEADWATER

CATCHMENT OF HOA BINH PROVINCE

Major: Natural Resources Management

Faculty: Forest Resource and Environmental Management

Student: Nguyen Van Cong Student ID: 1553090035

Class: K60 – Natural Resources Management Course: 2015 – 2019

Advanced Education Program

Developed in collaboration with Colorado State University, USA

Supervisor: Assoc. Prof. Bui Xuan Dung

Ha Noi, 2019

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ACKNOWLEDGEMENT

First and foremost, to be able to conduct this research, we would like to

express our sincere respect to our supervisor - Assoc. Prof. Dr. Bui Xuan Dung for his

enthusiastic and patient support with invaluable comments. In addition, we appreciated

the support of other lectures during the time we analyzed the data.

Not only that, many thanks are due to our friends when we started to collect

and analyze data. They always give our team the support whenever we needed. In

terms of difficulties, the transport to study sites was hard without our companions.

Lastly, I express my gratitude to local people who own the Acacia

plantation model for allowing us to conduct this research in this site. They also

informed us about the weather which extremely support us to get the data.

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CONTENTS

ACKNOWLEDGEMENT ............................................................................................i

LIST OF FIGURES ....................................................................................................iv

LIST OF TABLES.......................................................................................................v

ABBREVIATIONS ....................................................................................................vi

ABSTRACT..............................................................................................................vii

CHAPTER I ................................................................................................................1

INTRODUCTION .......................................................................................................1

CHAPTER II...............................................................................................................4

GOAL AND OBJECTIVES ........................................................................................4

2.1. Goal...................................................................................................................4

2.2. Objectives..........................................................................................................4

CHAPTER III..............................................................................................................5

STUDY SITE AND METHODS .................................................................................5

3.1. Study Site ..........................................................................................................5

3.2. Methods.............................................................................................................6

3.2.1. Legacy data .................................................................................................6

3.2.2. Installing monitoring plot ............................................................................7

3.2.3. Survey time .................................................................................................8

3.2.4. Rainfall and soil physical characteristics measurement. .............................10

3.2.5. Runoff and Soil erosion measurement .......................................................12

3.2.6. Vegetation observation measurement ........................................................14

3.2.7. Topographic survey: Slope, coordinate system and altitude of four plots are

measured by using GPS and compass..................................................................14

3.2.8. Data Analysis: Data was processed by using Microsoft excel and SPSS. ...15

CHAPTER IV............................................................................................................16

RESULTS AND DICUSSION...................................................................................16

4.1. Soil physical factors and vegetation on study sites. ..........................................16

4.2. Precipitation characteristics ..........................................................................16

4.3. Response of surface runoff to clear cutting Acacia plantation. .........................18

4.4. Response of soil erosion to clear cutting Acacia plantation ..............................22

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V. CONCLUSIONS, LIMITATION AND RECOMMENDATION ..........................26

5.1. Conclusions.....................................................................................................26

5.2. Limitation........................................................................................................26

5.3. Recommendation.............................................................................................26

REFERENCES