Information on Forest Science and Technology Number 2 2001

Summaries of papers in the bulletin; for more information contact

Research on some physiological and ecological characteristics of Tarrietia javanica Blume and Michelia mediocris Dandy as a foundation to develop technical measures for their planting

(Hoang Xuan Ty and Nguyen Duc Minh)

Tarrietia javanica and Michelia mediocris are two native timber species of high economic value which are grown in large volumes in native forests. They can meet the forest planting requirements.

In this paper the author presents research results on ecology, some physiological characteristics as well as research results on breeding and a forecast about the regions where these two species can be planted. The results form a basis for approaches in forest planting.

Techniques for natural broadleaved forest rehabilitation and maintenance in the Northern Central Highlands

(Ho Duc Soa, Tran Ke Lam and Nguyen Thanh Xuan)

This paper deals with research on techniques to rehabilitate and maintain natural broad-leaved forests in the north central highlands and makes the following recommendations.

  • Rich and average forests exploited at an intensity of 30-50% in combination with good husbandry practices can ensure good forest rehabilitation

  • Maintaining logged-over forest with techniques such as cutting and clearing climbers and bushes and girdling 40-70% of undesirable trees has no ill effect on forest productivity

  • Forest enrichment planting with native species such as Talauma gioi, Hopea odorata and Canarium oleosum has proved promising

Results of provenance trials, planting density and seedling type of Melaleuca cajuputi and M. leucadendra in the Mekong River Delta

(Ho Van Phuc, Nguyen Tran Nguyen and Nguyen Thi Tron)

Intensive management of Melaleuca leucadendra and M. cajuputi has been widely studied as a way of improving land use of acid sulfate soils. Research results presented in this paper show that:

  • With the provenances under the trial (7v05, 1201, 1206, 1207 and 1208) of the two species M. cajuputi and M. leucadendra at planting densities of 10,000 trees per ha and 20,000 trees per ha there is no variation in survival rate but height increment does vary.

  • There is no difference in height increment of the trees whether bare-root or ball seedlings are planted

Research on natural forest rehabilitation at Tan Lap, Dong Xoai, Binh Phuoc province

(Pham Van Dau)

Research on rehabilitation of depleted secondary forest by forest enrichment using row planting is described in this paper. A 20 ha model was established in the area of 1c forest, compartment 9.

Although it is only three years since establishment, satisfactory results have been obtained through the growth of planted trees of species of high economic value.

Investment must be continued for monitoring and perfecting the technology so that it can be applied in production forestry.

Tectona grandis tree selection for eastern South Vietnam and the Central Highlands

(Tran Van Sam)

This paper describes results of research on tree selection, establishment of a seed orchard from grafts in Bau Bang (eastern South Vietnam) and Kon Ha Nung (central Highlands) and experiments on rooting of teak cuttings. The following results were obtained:

  • 31+ trees selected from different sites

  • in an experimental seed orchard from grafts established in Kong Ha Nung the trees have a far greater diameter and height than trees grown in a seed orchard from grafts in Bau Bang

  • a teak seed orchard from seedlings and rooting teak cuttings gave poor results

The author makes the following recommendations:

  • The gene source existing in the experimental area of Bau Bang must be transferred to the new planting area where ecological conditions are suitable for teak by vegetative propagation

  • Various teak provenances, especially those received through international cooperation, should be trialled at different sites

Stability of tractors operating on sloping terrain

(Nguyen Can)

The stability of a caterpillar tractor working on sloping sites is a problem of practical significance. This paper deals with the calculation of the gradient limit of the slope to ensure stability against tractor rollover. It takes account of the effects of the motion, external forces and the uneven surface of the site. From the general formula, the problem is applied to a practical situation of a Komatsu D65A-8 caterpillar tractor operating with a front blade and multi-toothed ripping plough for land preparation on sloping ground in agricultural and forestry production in provinces of North Vietnam.

Developing a model of production line and technology in small-scale production of particleboard with eucalypt wood residue as raw material

(Tran Tuan Nghia)

The research described in this paper investigates the establishment of a model of equipment lines and technology for producing Eucalyptus particleboard using the waste from chipping lines. The following problems were identified:

  • To define the appropriate technology for producing Eucalyptus particleboard of small dimensions for household furniture

  • To design improvements to the production line for producing Eucalyptus particleboard on a small scale

Research on investment rate for protection forest establishment with native forest tree species

(Bui Minh Vu)

This paper presents the results of research on an investment rate for establishment of protection forest, with some native forest tree species in projects of the nationwide ‘Programme 327’.

By studying the investment rate in 30 forest plantation models in four regions to be protected (nine ecological zones) in 15 provinces and cities typically implementing projects of Programme 327, the author evaluates the achievements and the remaining problems to be overcome regarding economics, techniques and models. Taking into account the opinions of scientists and consultants as well as labourers, the author presents the results of a calculation of the investment rate on planting, tending, management and protection of 1 ha of forest in both planting systems, ie pure and mixed planting. The author makes some recommendations on silvicultural techniques such as supplementation of procedures and technical measures and on economics, such as economic and technical norms in forest planting and a frame of investment rates for each forest economic zone in the country.

Surveying trees outside the forest (Vietnamese version only)

Economic policy of tropical forestry in Central Africa (Vietnamese version only)

A demonstration course on ‘participatory research methods (Vietnamese version only)

A consultancy seminar on watershed research (Vietnamese version only)

Latest news

Oldest news