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BIOPHYSICAL CHARACTERISTICS AND LANDUSE/LANDCOVER CHANGES IN THE UPPER KUBANNI RIVER BASIN, KADUNA STATE, NIGERIA

By

Author

Presented To

Department of Surveying and Geoinformatics

82 Pages 6,376 Words 1,603 Views PDF Format No. of Chapters: 1 to 5 Chapters

ABSTRACT

The study is on Biophysical Characteristics and Landuse/landcover Changes in

the Upper Kubanni River Basin, Kaduna State, Nigeria. The objectives are

mainly to assess the local vegetation cover; evidence of firewood gathering and

grazing activities. Soil erosion and the spatial variation were also assessed as

well as the intensity of landuse/landcover changes and the significance of these

baseline data to water resource development in the Upper Kubanni Reservoir.

The data for local vegetation cover and soil characteristics were obtained

through field survey. Data on the vegetation cover was obtained using the

modified technique of Whittaker (1970). Two N-S transects were also

developed across the study area within which three quadrangles of 100m x100m

(10000sq meters) were sampled. Soil samples were collected from profile pits at

0 cm – 120cm depth. The soil samples taken from the pedogenic horizons of the

profiles were weighed and subjected to laboratory analysis particularly that of

the physical soil properties. Landuse/landcover changes over the years were

obtained from three sets of Land Sat imageries for the years 1987, 1994 and

2005. The results of the study showed evidence of vegetation degradation

characterized by few trees and are short statured. Beside the absence of

periodical grasses, the degradation was aided by the excessive wood harvesting,

cultivation and overgrazing activities on the basin. The soils of the study area as

shown from the results were mainly loamy in texture with preponderance of sand

fraction. And the aggregate stability index was relatively stable. But the soil bulk

density result of 1.53 mgm3 for a sandy loam soil is tending towards the

threshold. The landsat imagery showed that cultivation and grazing rank highest

in the landuse/landcover on the basin, while built up areas continued to rise.

Important to note also is the disappearance of natural open savanna vegetation

which was being replaced by shrub regrowth. Gully growth has been on the

increase. But a decrease in growth of gullies was observed in the year 2009,

which may not be unconnected to the tree planting exercise carried out by

Ahmadu Bello University. These results have implications on increasing

sediment yield into the Basin.

TABLE OF CONTENT

TITLE PAGE .. .. .. .. .. .. .. .. .. ..

DECLARATION .. .. .. .. .. .. .. .. ..

CERTIFICATION .. .. .. .. .. .. .. .. ..

iii

DEDICATION .. .. .. .. .. .. .. .. ..

ACKNOWLEDGEMENT .. .. .. .. .. .. .. ..

TABLE OF CONTENTS .. .. .. .. .. .. .. ..

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

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

LIST OF PLATES .. .. .. .. .. .. .. .. ..

xii

ABSTRACT .. .. .. .. .. .. .. .. .. ..

xiii

CHAPTER ONE

INTRODUCTION

1.1 BACKGROUND TO THE STUDY .. .. .. .. ..

1.2 STATEMENT OF THE RESEARCH PROBLEM .. .. ..

1.3 AIM AND OBJECTIVES OF THE STUDY .. .. .. ..

1.4 SCOPE OF THE STUDY .. .. .. .. .. .. ..

1.5 THEORETICAL FRAMEWORK .. .. .. .. ..

CHAPTER TWO

DESCRIPTION OF THE STUDY AREA

2.1 LOCATION, POSITION AND SIZE .. .. .. .. ..

2.2 GEOLOGY .. .. .. .. .. .. .. .. ..

2.3 RELIEF AND DRAINAGE .. .. .. .. .. ..

2.4 CLIMATE .. .. .. .. .. .. .. .. ..

2.5 SOIL .. .. .. .. .. .. .. .. .. ..

2.6 VEGETATION .. .. .. .. .. .. .. ..

2.7 LANDUSE .. .. .. .. .. .. .. .. ..

CHAPTER THREE

LITERATURE REVIEW

3.1 INTRODUCTION .. .. .. .. .. .. .. ..

3.2 HISTORICAL DEVELOPMENT OF ENVIRONMENTAL

IMPACT ASSESSMENT (EIA) .. .. .. .. .. ..

3.2.1 THE BIRTH OF EIA IN THE USA .. .. .. .. ..

3.2.2 THE SPREAD OF EIA WORLDWIDE .. .. .. .. ..

3.2.3 HISTORICAL DEVELOPMENT OF EIA IN NIGERIA .. ..

3.3 EIA OPERATIONS IN NIGERIA .. .. .. .. ..

3.4 RESERVOIR DEVELOPMENT AND THE

PHYSICAL ENVIRONMENT .. .. .. .. .. ..

3.5 STUDIES ON LANDUSE/LANDCOVER ON THE

UPPER KUBANNI BASIN .. .. .. .. .. ..

CHAPTER FOUR

METHODOLOGY

4.1 SOURCES OF DATA FOR THE STUDY .. .. .. ..

4.2 METHODS AND PROCEDURE OF DATA COLLECTION

FOR THE STUDY .. .. .. .. .. .. .. ..

4.2.1 VEGETATION SURVEY .. .. .. .. .. .. ..

4.2.2 SOIL SURVEY .. .. .. .. .. .. .. ..

4.2.3 SATELLITE IMAGERY WORK .. .. .. .. .. ..

4.2.4 SURVEY OF SPATIAL DISTRIBUTION OF GULLIES .. ..

4.3 METHODS AND PROCEDURE OF DATA ANALYSIS .. ..

4.3.1 VEGETATION DIVERSITY .. .. .. .. .. ..

4.3.2 SOIL ANALYSIS .. .. .. .. .. .. .. ..

4.3.3 DATA ANALYSIS ON DISTRIBUTION OF GULLIES

IN THE UPPER KUBANNI BASIN .. .. .. .. ..

CHAPTER FIVE

RESULTS AND DISCUSSION

5.1 VEGETATION INVENTORY .. .. .. .. .. ..

5.1.1 WOODY PLANTS SPECIES .. .. .. .. .. ..

5.1.2 HERBACEOUS PLANT SPECIES .. .. .. .. ..

5.1.3 HERBAGE YIELD .. .. .. .. .. .. .. ..

5.2 RESULTS OF SOIL SAMPLE LABORATORY ANALYSIS .. ..

5.2.1 PARTICLE SIZE DISTRIBUTION .. .. .. .. ..

5.2.2 AGGREGATE STABILITY .. .. .. .. .. ..

5.2.3 OTHER SOIL PHYSICAL PROPERTIES .. .. .. ..

5.3 LAND USE/LAND COVER CHANGES.. .. .. .. ..

5.4 EROSION TYPES AND SPATIAL DISTRIBUTION .. .. ..

CHAPTER SIX

SUMMARY AND CONCLUSION

6.1 OVERVIEW OF THE STUDY .. .. .. .. .. ..

6.2 FINDINGS OF THE STUDY .. .. .. .. .. ..

6.3 RECOMMENDATIONS/SUGGESTIONS FOR FURTHER STUDIES

6.4 CONCLUSION .. .. .. .. .. .. .. ..86

REFERENCES .. .. .. .. .. .. .. .. ..

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