Nguyen Anh Tiep
INTRODUCTION
Within poor, depleted, secondary forest types to be rehabilitated and improved, there is a forest type which has been affected by burning many times for agriculture cultivation, so that the soil is degraded, the surface soil layer is thin and dry and vegetation contains Neohouzeaua dullosa, bamboos, climbing plants and shrubs. In many production organizations, such areas were left because of the difficulty of vegetation treatment.
The problem is that in order to improve this forest type, research must be carried out to select suitable tree species and to apply suitable silviculture measures in vegetation treatment so that planted trees have good conditions for growth and development in the first few years in order to avoid competition of bamboos and shrubs. The solution is to use light-preferring, fast -growing soil-improving tree species which can limit the development of bamboos and climbing plants, then under these trees, the other, shade – tolerant, valuable tree species will be planted.
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