Home gardens in Sri Lanka
offer a highly diversified and economically viable form of land use. They
produce a variety of products such as food, fruits, medicine, spices, fuelwood
and timber.
There are more than 300
different woody species in home gardens and 120 of these species are common. Traditionally,
coconut, jak and mango were common species. In the recent past, species
composition has changed with the inclusion of commercially valuable exotic
timber species such as teak, mahogany, alstonia, albizzia and eucalyptus. These
five species are among the top 10 species in the order of frequency of
occurrence and account for 15 percent of the total number of trees recorded in
the assessment. They produce over 40 percent of the total timber volume.
The most important tree
species found in home gardens in terms of producing food and timber are well
distributed across the climatic zones. Twenty-two such species are distributed in
excess of 50 percent of the land area. The majority of tree species,
especially the ones that are grown traditionally, has more trees in lower
diameter classes showing the sustainable nature of home gardens.
A conservative estimate
shows that home gardens are capable of producing over 1.3 million m3
of industrial timber and fuelwood, which represents 41 percent of the national
demand for industrial timber and 26 percent of the biofuel demand.
The findings of this
assessment provide the basis for reviewing the current restrictions on the transport
of certain timber species. The data on availability and distribution of
different species in geographical areas could be used to devise an effective
system to facilitate timber transport.
The assessment shows trends
rather than accurate figures due to the nature and intensity of data
collection. The findings, however, provide the basis for more accurate
assessments especially with the use of current technology such as satellite
image interpretation.