Information on Forest Science and Technology Number 1 2001

August 3, 2006 by

Summaries of papers in the bulletin; for more information contact info@fsiv.org.vn

Problems concerning management and sustainable use of mangrove forest systems

(Do Dinh Sam)

Mangrove and M. leucadendron forests in Vietnam are significant economically, environmentally and socially. This paper reviews the research on and management protection and utilization of mangrove and M. leucodendron forests in recent years. The paper also raises some problems that need to be addressed now and in the future for restoration and sustainable utilization of these ecosystems, such as their possible rehabilitation when they are destroyed. Practical problems in management of these forests and the role played by policy and social forestry in sustainable management and utilization of these ecosystems are also mentioned.


Potential rehabilitation of natural evergreen broadleaved forests after slash and burn cultivation in the Central Highlands — preliminary results

(Vo Dai Hai and Tran Van Con)

Natural evergreen broad-leaved forests undergo a complex and long-term regeneration and rehabilitation process after slash and burn cultivation. Three forest succession phases can be identified by different features of the tree species. Phase 1, year 1—3 is the phase of pioneer, light demanding bush and small timber tree species with a short life. Phase 2, year 4—7 is the phase of young forest with pioneer light demanding and shade tolerant species dominant in the early stage. Phase 3, year 8 and onwards represents rehabilitated forest with restored initial species composition containing shade tolerant, slow growing species with timber of high economic value.


Application of advanced techniques to establish a land-use model to restore the ecological environment and contribute to income improvement of the peasants in Nham Bien mountainous region, Yen Dung district, Bac Giang province

(Ngo Dinh Que)

The project reported in this paper aimed at both restoration of the ecological environment and improvement of people’s incomes. It was carried out from December 1997 to December 2000. A preliminary result of the project is the successful establishment of models of forest environment restoration on the side and top of Nham Bien mountain with a variety of forest tree species (20 ha) such as Pinus caribaea, P. merkusii, Acacia auriculiformis, A. hybria, Tephrosia candida (soil cover) and a model of perennial fruit trees (10 ha) of high value, such as Litchisinensis, longan, custard apple, persimmon, grafted mango, Taiwanese papaya and pineapple. As well, the project has organized demonstration courses for technology transfer serving the local people and nearby communes and suggested an approach for application of advanced techniques for the project in similar regions.


Results of a survey on forest vegetation in Konplong district, KonTum province

(Pham Gia Hoi, Trinh Duc Nhuan and Vu Van Thanh)

This paper briefly describes results of research and a survey on the forest plant resources of Konplong. This area contains 273 woody species belonging to 126 genera and 65 families. The author also identifies and assesses the endemic, rare and valuable tree species and reports on some forest types arising due to special topographical, climatic and soil conditions.


Determination of forest plantation species and priority species for the Central Highlands

(Tran Van Con)

According to the country’s reforestation plan, 500,000 ha of new forest must be planted by 2010 in the Central Highlands. One of the most important tasks is to match the species being planted with the planting sites.

The paper describes typical features of the main ecological zones of the Central Highlands. Based on the list of the proposed 80 promising tree species as candidates for the region (large timber, 48 species; small timber, 10 species; non-wood special products, 12 species and 10 supporting species) and on aims of forest planting, the author suggests a structure of planted species and the aims of forest planting for each ecological zone.


Conditions of protection forest models on shifting sands of coastal central Vietnam

(Dang Van Thuyet)

The coastal sand area of Vietnam represents 1.4% of the natural area of the whole country, mainly concentrated in coastal central Vietnam. The main successes with forest planting on sandy areas have been achieved with permanent and semi-permanent sand dunes. For shifting sand dunes, although trials of protection forest against shifting sand have also been established, many problems remain, relating to trial plantings with Casuarina equisetifolia from seed and cuttings (produced by China) and with drought-resistant Acacia. Research is needed on filling planting holes with grasses and wasted plant materials before planting, planting bushes in bands as windbreaks and maintaining soil moisture for the planted trees to survive the dry season.


Determination of characteristics of Acacia auriculiformis wood as raw material for blockboard manufacture

(Nguyen Trong Nhan)

Wood of 10-year-old A. auriculiformis trees was studied to supply raw material for manufacture of blockboard in furniture making. A woodblock with a cross section of 2.4 x 5 cm, 100 cm in length, has a maximum deflection of 1.004 cm. With the same cross-section, the 50 cm long block is not curved. When blocks 100 cm long, with a cross-section of 2.4 x 5 cm are produced, wood usage reaches 33.6%. With the 50 cm long blocks, the percentage of wood used is 50.35%.

Blockboard from A. auriculiformis wood is not uniform in colour. Light coloured sapwood represents 25.07% and dark heartwood comprises the other 74.93%. On the blockboard surface, wood knots represent 13.75% of the area.

A. auriculiformis wood is a good raw material for blockboard manufacture when the blocks do not exceed 50 cm in length. A dark coat must be applied to make the colour of the blockboard surface relatively uniform.


Rotational slash-and-burn cultivation land of ethnic minority groups

(Vu Long)

In mountainous regions where there is not enough permanent agricultural land for food crops, ethnic minority groups have to use hilly areas for food production using slash-and-burn, rotational cultivation. These areas total millions of hectares. The policy on agricultural and forest land allocation to households does not include land for slash-and-burn cultivation. The Forest Protection Agency has only just finished planning for this type of land. To ensure the right of the ethnic minority people in mountainous regions to have land for production, the policy on land allocation to households must be supplemented. Land for slash-and-burn rotational cultivation must be classified as forest land.


Human resources and training for a project on planting five million hectares of new forest

(Cao Lam Anh)

There is a shortage of forestry staff at a number of places but recruitment is difficult as salaries and regulated staff numbers are low. While people working in the areas where forestry activities take place still encounter many hardships, there are not as yet any systems of priorities and favourable allowances. This is one of the reasons for the staff shortages, although many people have been trained by the Forestry Branch. Many trained staff have tried to find jobs in other branches or to engage in other activities for higher payment.


Paulownia fortunei planting technique (Vietnamese version only)

Fokienia hodginsii planting technique (Vietnameses version only)

Logging damage in relation to forest exploitation intensity in tropical dense forest of Central Africa (Vietnamese version only)

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