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Using tree- ring analysis to study the growth performance from saplings to trees for five savanna species in West Africa

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par Cocou A. F. Sinsin
Université d'Abomey- Calavi (Bénin ) - Master of science  2009
  

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UNIVERSITY OF ABOMEY-CALAVI (BENIN)

****************

FACULTY OF AGRONOMIC SCIENCES

(FSA)

************

Department of Natural Resource Management
(AGRN)

TOPIC

Submitted by
Franck Cocou A. SINSIN

Promoters

Prof. Dr. Ir Brice A. SINSIN
(University of Abomey-Calavi, Benin)

Prof. Dr. Stefan POREMBSKI
(University of Rostock, Germany)

Dr Bettina ORTHMANN
(University of Rostock, Germany)

Defended 6th January 2009

TABLE OF CONTENTS

TABLE OF CONTENTS i

LIST OF FIGURES iii

LIST OF PICTURES iv

LISTE OF TABLE iv

DEDICATION v

ACKNOWLEDGEMENTS vi

TECHNICAL EXPRESSIONS vii

Abstract ..viii

Résumé ix

1. Introduction 1

1.1. Background on tree dating methods 1

1.2. The interest of the study 2

1.3. The aims 3

1.4. Research questions 3

2. Study area 3

3. Materials and methods ..5

3.1. Studied plant species and samples collection 5

3.2. Sample processing ..9

3.3. Method used to study the wood anatomy .10

3.4. Method used to study the growth performances 10

3.5. Cross-dating 11

3.6. Method used to study the fire regime 12

3.7. Nature of data 12

4. Results 13

4.1. Wood anatomy of different species studied 13

4.1.1. Anogeissus leiocarpa 15

4.1.2. Detarium microcarpum .16

4.1.3. Diospyros abyssinica 17

4.1.4. Isoberlinia doka 17

4.1.5. Pterocarpus erinaceus .18

4.1.6. Conclusion on wood anatomy 19

4.2. Age and growth performances for investigated species 19

4.2.1. Age, ring increment and cross-dating 19

4.2.2. Growing in height .23

4.2.3 Conclusion on tree species growth 24

4.3. Fire regime analysis from tree-rings of investigated species... 24

4.3.1. Fire master chronology in CNP and UAC 24

4.3.2. Fire interval 25

4.3.3. Fire frequency and intensity in Comoé national Park and Upper Aguima Catchment 27

4.3.4. Conclusion on events of fire in savanna areas . 27

5. Discussion 28

Conclusion 29

6. Literature cited 30

Appendix

LIST OF FIGURES

Figure 1 Mean monthly rainfall for studied sites (CNP & UAC)

Figure 2 Macroscopically polished stem discs observation of investigated species Figure 3 The different parts of wood. Stem disc of D. microcarpum

Figure 4 The common wood anatomical legend

Figure 5 Wood anatomy of A. leiocarpa (Combretaceae)

Figure 6 Wood anatomy of D. microcarpum (Caesalpiniaceae)

Figure 7 Wood anatomy of D. abyssinica (Ebenaceae)

Figure 8 Wood anatomy of I. doka (Caesalpinaceae)

Figure 9 Wood anatomy of P. erinaceus (Fabaceae)

Figure 10 Cross-dating ring width of Diospyros abyssinica oldest sampled tree cut at two different heights

Figure 11 Cross-dating ring width of Detarium microcarpum oldest sampled tree cut at two different heights

Figure 12 Cross-dating ring width of one of sampled tree of Anogeissus leiocapus cut at two different heights

Figure 13 Initial height growth for some of investigated species

Figure 14 Fire history in Comoé National Park

Figure 15 Fire history in Upper Aguima Catchment

Figure 16 Example of fire scars on stem discs

Figure 17 Illustration of compartmentalisation concept on D. microcarpum stem disc

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