Abstract of a presentation conducted by
Sohani Vithanage
Department of Forestry and Environmental Science
University of Sri Jayewardenepura, Sri Lanka
Decisions
about the use of land have always been a part of human society. Forestry
planning has always taken account of the influence of conditions of land in
taking management decisions. The approach and methods of land evaluation were
developed in order to provide a systematic framework for assessing the effects
of land on potential benefits of each land use. Land evaluation is based upon a
comparison between land use and land type. Land use related to forestry can be
broadly categorized as production forestry, conservation forestry, recreational
forestry and community forestry. These major land uses can be further described
in detail according to tree species, silvicultural methods, harvesting
practices etc. The focus of land evaluation is to access the requirements and
limitation of each of this land use and to compare this with the properties of
land.
In
the process of land evaluation land use requirements for each identified land utilization
type is defined. Simultaneously, land qualities and characteristics of each
land unit is described using literature surveys and ground surveys. These data
is then coupled with economic and social data to develop a comprehensive
comparison of land use with land. The outputs of land evaluation can be
presented in terms of land suitability classifications or land suitability maps.
At present, this procedure can be carried out with the help of computerized land evaluation systems and geographic information
systems. In determining the species site suitability for
forest plantation establishment, three aspects have to be considered. They are
purpose of plantation, species availability and environmental conditions. For
this process, depending on the species and sites, information survey can extend
from local level to international level.
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