Information on Forest Science and Technology Number 3 2000

Summaries of papers in the bulletin; for more information contact

Results of natural forest rehabilitation at Cau Hai Silvicultural Experimentation Centre, Phu Tho province

The area surrounding the Cau Hai Silvicultural Experimentation Centre was originally covered by natural evergreen broad-leaved forests but for a number of reasons these forests have been seriously devastated. By 1990, only about 30 ha of 111A1 forest remained, the rest were mainly 1C and 11A forests. Therefore, the Centre’s focus has been on rehabilitation of natural forest. From 1991 until the present, silvicultural measures have been successfully implemented with forest improvement methods such as clear felling and replanting with native species, improvement by bands, tree planting under the forest canopy, forest enrichment by tree planting in rows and promotion of natural forest regrowth with or without replanting in patches. Tree species for forest planting or forest enrichment were mainly Erythrophloeum fordii, Manglietia glauca, Styrax tonkinensis, Ormosia balansae, Pygeum arboreum, Talauma gioi, Cinnamomum albiflorum and Peltophorum ferrugineum.

Flora of Ca Mau mangrove forest

(Dang Trung Tan)

Due to its significance, researchers have paid much attention to the ecosystem, particularly the flora, of the Ca Mau mangrove forest.The Minh Hai Centre for mangrove forest research recently carried out a survey of the Ca Mau mangrove forests which resulted in the detection of new plant species, bringing the total number of known species to 228, compared to the 217 identified previously.

Results of research on forest planting with Canarium album Raeusch to provide plywood raw material

(Pham Dinh Tam)

Research on the establishment of Canarium album Raeusch plantation for plywood raw material supply was carried out by the Forest Science Institute of Vietnam from 1995 to 1999 with four main objectives: survey demand and standard of wood as raw material; review and evaluate existing C. album forest planting models; supplementary research on some biological characteristics of C. album and research on silviculture techniques. Research results show that C. album wood from plantations meets the normal criteria for wood as a raw material. C. album is widely distributed across the country from 10—1000 m above sea level. C. album is tolerant to acidic soil where there is humus and a deep soil layer. C. album can be grown with other species at a young age but requires more light later.

Results of a survey on species composition of insect pests and damage levels in acacia and eucalypt trials at Ba Vi, Ha Tay province

(Nguyen Van Do)

A survey of insect pests was conducted from 1997 to 1999 at acacia and eucalypt provenance trials at the Centre for Forest Tree Improvement, Forest Science Institute of Vietnam at Da Chong and Cam Quy communes, Ba Vi district, Ha Tay province. A number of pest insect species on acacia and eucalypt have been recorded, of which, Hypomeces squamosus and Homoeocerus walkeri (on acacia) and Strepsicrates rothia and Trabala vishnou (on eucalypt) are common pest insect species in these areas. As well, the type of damage and the grouping of the pests have been determined. Composition of the pests has also been analysed at species and provenance levels of acacia and eucalypt for forest protection and management.

Socio-economic effectiveness of integrated processing of some types of forest plantation wood

(Tran Tuan Nghia and Bui Chi Kien)

The research deals with the socio-economic effects of an integrated wood processing technology for sawing and chipping some types of plantation wood. The problems identified were: to define the ratio of wood of a suitable dimension for sawing, the appropriate processing technology and the best sawing method to obtain the highest ratio of sawn wood and to identify the economic effectiveness of the processing technology applied for forest plantation wood.

Some experiences in sustainable forest management in a Vietnam—Germany reforestation project

Sustainable forest management is a highly significant partof forest establishment and development in terms of its contribution to environmental protection, meeting society’s ever-increasing demand for forest products, creating employment, raising incomes and contributing to stabilizing and improving the living standards of people engaged in forest occupations. The Vietnam-Germany reforestation project has achieved some preliminary principles of sustainable management of forest plantations in Vietnam, especially in regard to technical, socio-economic and policy aspects. The experience gained from this project provides a valuable lesson for forest management in Vietnam.

Developing a small machine for producing wood-chips for production of particle board

(Do Dinh Binh)

The forest engineering research division of the Forest Science Institute of Vietnam has introduced a new machine for small-scale production of wood chips for particle board manufacture. The machine has an annual capacity of 1,000-1,200 m3 of roundwood. It is neat, light and run by a 15kw electric motor. The machine weighs 1,000 kg , works by an electro-hydraulic system and can be totally automatic.

The development of this machine proves the ability of the forest mechanics branch to manufacture their own machinery.

Typical features of a Vietnamese family farm

(Bui Minh Vu and Nguyen Thi Lai)

Farm economies, in the world in general and in Vietnam in particular, have a long history. The establishment of farms is necessary for economic development in every country. It is their role to produce a great variety of commodities that meet the requirements of the market. Farm economies differ in scale, forms of labour used, products and consumer markets.

Feasibility of planting 3 million ha of production forest as part of the 5 million ha forest project

(Vu Long)

Planting a new 3 million ha of production forest is an important component of the 5 million ha forest project. Two years after the project began only 150,600 ha had been planted, accounting for 5.1% of the target. This paper addresses the feasibility of planting 3 million ha of production forest.

The author analyses the achievements and the remaining problems of the project with regard to planned targets, capital, the market as well as organization of and guidance to the project. He also gives recommendations for implementing the project.

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