Tropical rainforest deforestation, biodiversity benefits and sustainable landuse: analysis of economic and ecological aspects related to the Nguru mountains, Tanzania.
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Date
1995
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Publisher
Agricultural University of Norway
Abstract
The purpose of this report is to identify the main landuse and landuse problems with reference
to agriculture and forestry in the Nguru mountains, and the main factors causing these problems,
and analyze ways to reduce them in order to prevent forest degradation and deforestation. Based
on data collected in villages in the Nguru mountains using interviews, field observations, and
secondary sources it seems that ecological and socio-economic factors have played an important
role in shaping the existing landuse practices, landuse problems and factors causing landuse
problems in the Nguru mountains. The major landuses are agriculture and forestry. The
agriculture is dependent on rainfall, growing mainly subsistence food crops using traditional
farming practices. Forestry is for water conservation but also supplies local communities with
both timber and nontimber forest products. Relative to other landuses such as settlements and
grazing, agriculture and forestry have contributed most to the prevailing landuse conflicts in the
Nguru mountains. The main landuse problems in the Nguru mountains are: deforestation pressure
through encroachment for agriculture and settlements, forest degradation through excessive forest
product exploitation, frequent and uncontrolled bush fires, land degradation and soil erosion,
declining crop harvests, squatters inside the Forest Reserve, farming in the buffer zone around
the rainforest and non-adherence to forest control measures. The impact of these landuse
problems on the rainforest have been more severe on lowland rainforests where high rates of
rainforest conversion to agriculture and other landuses were observed. These landuse problems
are a consequence of many interrelated factors acting as local agents or beyond local boundaries.
These factors are caused by complex processes resulting from human social dynamics. From
survey results in the area these factors range from social, economic, cultural and political forces
which are related to each other in multilineal causal chains. The main ones are: growing
population, land scarcity, search for market goods, increased domestic demand for food and forest
products, poverty, lack of knowledge, lack of an effective extension service, market failures such
as breakdown of traditional management systems due to commercialization of demand for
resources, government failures such as inefficient government policies, risks and uncertainty in
farming (pests, diseases and vagaries of climate) insecure land rights under customary land tenure
system, traditional or cultural barriers, conflicting objectives between land users, failure to control
protected areas such as Forest Reserves and decline in forest product supply and lack of income
from outside agriculture and forestry. It seems the government has not been able to control
landuse problems through policy measures or coercion. Also the market has not been able to do
so, due to its failure to provide negative feedback loops to check landuse problems. Widespread
market and government failures largely account for this situation since, they provide incentive
for poor landuse practices. Rural poverty and efforts to adapt to economic hardships at the local
level have a significant influence on landuse problems. Vaguely defined, unequitable and
uncertain land tenure conditions, lack of knowledge and traditional barriers have added a
complicating dimension to landuse problems. The poor local people, the direct agents of
degradation and deforestation pressure, have been made to rely on unreliable access to credit
markets due to the absence of guarantees (collateral), caused by lack or uncertainty of tenure. The
effect has been to increase landuse problems. Since the welfare and survival of the local people
in the Nguru mountains, are inextricably linked with agriculture and the environment, they must
improve current landuse practices, in order to come to terms with the reality of resource limitation and carrying capacity of their ecosystem. Wise management of land and forest
resources requires appropriate landuse practices, to alleviate landuse problems in order to improve
the standard of living and preserve the biological systems, especially the tropical rainforest upon
which they depend. The strategy recommended requires landuse planning for efficient use of
resources and integrated planning to harmonize conflict between land uses. Other measures
include family planning to control population growth, education to enhance change of attitude
on resource use, by overcoming communication breakdown between resources users and
protectors through direct dialogue and community involvement, giving some specific rights to
property in reserved forests, and benefits to villagers to meet their needs while protecting the
resources, improving traditional landuse systems and traditional knowledge, incorporating
agroforestry in farming systems, removal of institutional barriers to wise landuse by government
through appropriate policy changes, and improvement of rainforest management methods to
enhance forest protection.
Description
Keywords
Tropical rainforest, Deforestation, Sustainable landuse, Analysis of economic and ecological, Nguru mountains, Tanzania., Biodiversity, Buffer zone,, Landuse planning, Agriculture, Socio-economic analysis, Compromise programming.