Ho Duc Soa, Tran Ke Lam, Nguyen Thanh Xuan
FSIV
Natural forests play a very important role in human life. Apart from timber, firewood and other forest products supply they do play a role in providing shelter belt, soil erosion and leaching control, regulating the climate and protecting the environment. Natural forests have been and are being seriously devastated, especially from 1975 now. According to 1999 statistics the area of natural forests in our country is about 9.44 million hectares with a growing stock of about 720 million m3 representing 96% of total timber growing stock in the whole country. As compared with 1992, the natural forests area increases 0.8 million hectares (0.95%) due to the implementation of the programme for sedentarization and fixed cultivation, allocating on contract the forest natural regrowth tending, protecting and forest development by project 327 or 661 and the priority given to home forest and forest farm development. There existed previously in the Central Highland rich and diversified natural forest with utterly complex species composition and structure but due to many causes, the natural forests there are now much diminished in area, growing stock and as well as in quality. Of the main causes, there is a cause concerning techniques such as: exploitation without ensured regeneration, repeated cutting of trees of economic value, low efficiency in forest rehabilitation and maintenance in addition to mass immigration of people, land reclamation for agricultural and industrial crops. For natural forest rehabilitation, a system of techniques, procedures, forest regrowth tending, forest regeneration promotion and new forest planting is being implemented in practice and bringing about higher efficiency. The above mentioned technical measures, however, are of a principle and guidance nature and difficult to be applied in each concrete ecological zone. As regards the northern Central Highland with rich and diversified natural broad-leaved forest having very complex species composition and structure, much effort and resources must be invested for more complete and concrete research especially on the forest rehabilitation and maintenance aimed at high forest productivity and quality, bringing into full play all-sided beneficiary effects of the existing forest.
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