1.1
Introduction:
Global land use has significantly changed in the
past decades. “Historically, the driving force for most land use changes is
population growth although there are several interacting factors involved” (Lambin
et al., 2001, 2003). A
populated area consists of good variety
of independent activities and the choice of location of these activities are
normally made after an assessment of the relative advantages of various
locations for the performance of the activities in question, given the general
framework and knowledge prevailing. This phenomenon is unfolding in different
forms and intensities in different cities such as Lagos, Nigeria; Francistown,
Botswana; and Manila, Philippines (UNCHS, 2006). This is a result of variations
in population growth, land tenure systems, levels of technology and planning
regulations. Developments in Ghana is experiencing similar growth pressures
with development characterized by multi-purpose land uses for residential, commercial,
agricultural, civic and culture. The objective of this piece is to look at the
relationship between population changes and land use.
1.2 An Overview of Population and Land Use Relationship:
From 1990 to the year 2020, a total of approximately 14 million hectares
of land (approx. 475,000 ha/yr.) in developing countries will be converted for
urban purposes (Queen et al, 2003). The environmental implications of
population processes have been most carefully examined within the context of
developing countries. This focus can be
partially justified by the fact that much of the population within some of
these regions continue to rely upon local environmental resources for
subsistence. Fulfilling the resource requirements of a growing population
ultimately requires some form of land-use change, be it to provide for the
expansion of food production through forest clearing, to intensify production
on already cultivated land, or to develop the infrastructure necessary to
support increasing human numbers. As such,
it is clear that population is associated with changes in land use, although
political forces, cultural values, institutional histories, and other mediating
factors ultimately shape the association within any particular geographic
context.
In Rwanda, high population densities have been linked to the conversion
of marginal lands, such as steep hillsides, to agricultural use (May,
1995). Similar conclusions have been
reached in Zaire, DR Congo (Shapiro, 1995).
The influence of mediating factors on the association between population
and land use change is evident in Honduras, where research suggests that
environmental destruction is due more to inequality of resource distribution
and patterns of economic development than to population pressures per se (DeWalt
et al. 1993). Demonstrating the influence of political forces, government
sponsored transmigration projects have resulted in the deforestation of at
least 750,000 hectares per year in Indonesia (Fearnside, 1997). Finally, in South America, a mixture of
policy, poverty, and demographic pressures has been found responsible for much
of the deforestation of the Brazilian Amazon (Moran, 1992).
A study by United States’ Department of Commerce, in the California
portion of the Mojave Desert encompassing approximately 7,400,000 hectares with
over 450,000 people, on human dimensions of land-use change in 2001 reviews
that human population (increasing from nearly 70,000 in 1970 to over 300,000 in
1990) represents a key driver of environmental change within the area. The
study demonstrates that the increased habitat pressures brought to bear upon
the natural landscape as a result of population growth, densities, and related
development patterns. In particular,
higher density development implies significantly more habitat conflict.
The European Union Population and Land Use Journal, indicates that
“recent decades have seen the closure of many farms and the loss of 2 million
jobs in rural areas. This has significantly altered the pattern of population
distribution. It has been calculated that the combined effect of urbanization
and mobility in Europe’s most densely populated countries causes built-up areas
to increase by 2% every 10 years”. With continuing proliferation of human
influences on landscapes, there is mounting incentive to undertake quantification
of relationships between spatial patterns of human populations and vegetation.
Annually, population growth adds 78,000,000 more people to the planet while
27,000,000 tons of topsoil is lost (Cascade
Mountain Institute, 2013).
An evidence from both Thailand and China indicates that the number of
household units may be a more important determinant of land use than the number
of people per se (Entwisle 2001). This result seems plausible because the
number of household units may drive the actual micro-level patterns of
consumption more closely than the number of people. To the extent households
are the main consumers of vegetative resources, particularly in the form of
fuel wood and fodder, greater numbers of households should result in decreased
land devoted to vegetation. Thus at the local community level, change in the
number of households may have a stronger influence on changes in land use than
change in the number of people.
1.3 A Case Study of Ghana:
As with many African
countries, Ghana’s population is growing fast. The results of the 2010
Population and Housing Census (PHC) showed that the total population of Ghana
is 24,658,823. The results indicated that Ghana’s population increased by 30.4
percent over the 2000 population figure of 18,912,079. The recorded annual
intercensal growth rate in 2010 was 2.5 percent as against 2.7 percent recorded
in 2000. This is lower than the rate for West Africa (2.9%), but higher than
the global rate (1.5%). It also showed an increase in population density from
79 people per square km in 2000 to 103 per square km in 2010.
Interestingly, migration
has caused some communities to grow at double the rate of other towns and
cities. Such growth is mostly due to the communities’ favourable location
within the transport network and its economic importance. Other considerations
in the growth rate of Ghana relates to the internal growth of cities resulting
from high birth rates. Population is not evenly distributed spatially anywhere.
While there are pockets of heavy concentrations, there are equally vast lands
which are sparsely populated or largely uninhabited. A number of factors
account for this and they include climatic, vegetational cover and
topographical factors which primarily determine the availability of habitable
land, water and fertile soils. These factors are affected by human decisions
and actions which sometimes apportion land for different uses, such as natural
reserves, industrial use, parks and gardens etc. While the natural environment
presents challenges and opportunities for human habitation, it is the human
population that ultimately determines which place they would finally settle,
based on their level of technology and the decisions they make.
In Ghana, the natural
environment has, to an appreciable extent, affected the spatial location of
people. For example, the Akwapim and Kwahu topographical landscape has posed
challenges and physical barriers to the creation of settlements. Road network,
especially feeder roads, becomes unmotorable during rainy seasons on the
Akwapim and Kwahu ridges. This condition tends to prohibit frequent migration
of people to these ridges for permanent habitation. At the same time, the
construction of the Akosombo dam and the subsequent creation of the Volta Lake,
for example, displaced and relocated a sizeable population that originally was
living along the Volta River. Similarly, natural disasters affect the pattern
of population distribution. The outbreak of diseases could affect population
distribution, as in the case of the onchocerciasis zone in the middle belt
along the Black Volta basin and the prevalence of river blindness, sleeping
sickness brought about by the black fly. Although efforts have been done to
help curb these environmentally related diseases (Taylor et al, 2009), however the areas noted for
onchocerciasis have not attracted large populations to take advantage of the
vast lands for agricultural activities.
Historically, population
distribution has followed the spatial pattern of ethnic groupings which dates
back to the period before colonisation, especially during the slave trade era,
when the location of particular ethnic groups, to some extent, determined their
source of protection. Following colonisation and subsequent development of the
coastal ports and harbours as well as the forest belt, the northern
territories, now made up of Northern, Upper East and Upper West, became a major
source of labour for the forest agricultural belt and key mining centres down
south. A major feature of the population distribution trends in Ghana is the
active conversion of subsistence agricultural holdings into housing estates,
industrial estates, infrastructure, schools, offices, shops, recreational
grounds and related urban uses. Clearly, the spatial population distribution
has over the years had relevant implications for spatial development (land use)
and vice-versa.
1.3.1 Key Causes and Implication:
The continuous change in
land use of areas is an utmost concern of planners and decision-makers. These
changes come about as a result of rapid increase in population and the ever
increasing demand on land which poses a great deal of challenge to existing
land use. The unplanned expansion of areas and encroachment by people for
various purposes also contribute to land use changes. Most developers do not
acquire permits to change the use of a property in a designated zone. In Ghana,
authorities recognize these changes when adverse effects have been created and
much cannot be done to mitigate them. It is undeniable that the transformation
is initiated by the market forces of demand and supply and evidence point to
the fact that if authorities do not take into consideration this obvious
development of rural and urban areas, then the invasion of commercial land uses
rate will rapidly reduce the residential land use in areas and eventually lead
to the creation of an unprecedented commercial centre. The effects of land use
change culminate in high cost of a plot of land and multiple selling of a piece
of land and development of unauthorised structures, slums and squatter
settlements.
1.4 The
Way Forward:
Based on the above
literature, the following recommendations have been put forth to help make population
and land use contribute to the development of Ghana.
- Coordination
and Collaboration of Land Use Planning Stakeholders
Institutions such as Town
and Country Planning Department (TCPD), Building Inspectorate Division and
Finance Department play key roles in the management of physical development and
hence the need for an enhanced coordination. TCPD, even though is responsible
for physical planning, should as well take special interest in the
implementation of the plans. There is the need for these institutions to be
brought to function together under one platform to ensure that the
implementations of plans are enforced as expected. It can be inferred that
physical development is not an institution’s business but a whole array of
actors with each having its own interests. Thus, any effort to make it better
requires an active involvement of these institutions collaborating with each
other. More so, the capacity of the institutions needs to be given the
necessary boost to make them function effectively.
- Revision
of Existing Planning Scheme
It is quite evident that,
the changing pattern of land use will always occur at a point of population
growth. There is therefore the need to review existing planning schemes and
make appropriate allocations for emerging land uses. The revision must allocate
alternative sites for the provision of community facilities like market, roads,
schools, open space to enhance the modus
vivendi of the people. A designated commercial corridors and parking areas
will help solve congestion problem especially in the urban areas. Again, designated funeral grounds as
well as public recreational grounds and play grounds need to be rectified for
balance physical development. This can help solve frequent blocking of roads
for funeral ceremonies.
- Effective
Monitoring and Evaluation Mechanisms
As development proceeds, an
effective monitoring and evaluation ‘follow up mechanisms’ must be done by the
Building Inspectorate Division together with the Town and Country Planning
Department to ensure early detection of unauthorised developments. Also,
community development watchdog units must be established with authorization to
direct orderly development in various communities.
- Continuous
Public Education on Physical Development
The TCPD should engage in a
continuous and intensive public education on the processes involved in carrying
out physical development. Stakeholders especially the traditional authorities
and developers should be sensitized on how to play their roles effectively to
ensure orderly physical development. It is believed that a continuous and
intensive public education can go a long way to preclude unauthorised
development.
- Intensify
Education on Family Planning
Education about family planning must be made
common. This is one of the most key measures to check the rapid population
growth. The Family Planning Campaign should be a community movement instead of
national campaign. People must be made aware of the different methods of birth
control. Thus, the awareness and education of family planning among the people
can help to increase the mean age of marriage, increase the knowledge about
family planning methods and family welfare measures to control births, reduce
the rapidity of child birth and thereby reduce the birth rate.
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