Information on Forest Science and Technology Number 2 2005

July 5, 2006 by

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


1. Trial results of Acacia and Eucalyptus hybrids in Southeast Viet Nam

(Tran Huu Bien)

Hybridization is one of the advanced steps in forest tree breeding however this procedure has only been applied to some genera such as acacia, eucalyptus and melaleuca. Trial results on hybrids on ancient gleyed alluvial soil in the southeast of Viet Nam of Acacia hybrids 12 months after planting showed growth of D1.3 = 5.8cm; H = 6.0m and Eucalyptus hybrids after 24 months achieved D1.3 = 8.5cm; H = 8.5 cm. Most of the hybrid clones exceeded the growth of the parental species and most clones have grown well, without insect pests. These hybrids will contribute to development of high quality forests in the Southeast.


2. Experiment on establishing Hopea odorata Roxb high quality model forests in the Southeast

(Nguyen Anh Tuan)

Hopea odorata Roxb is a timber species belonging to the Dipterocarpaceae family. The timber is very high quality, easy to process and is often used to make furniture, as well as construction timber, especially for ship building.

The forest area for growing Hopea odorata has been increasing remarkably but the quality of these plantations was not up to expectation. Based on surveys of these plantations, it is considered to be possible to plant intensively managed forests of Hopea odorata to achieve high productivity.

A research project was established at Bau Bang Forestry station in 2000 as part of a 15 ha experimental area, of which: 05 ha is pure Hopea odorata, 05 ha is Hopea odorata interplanted with Cassia siamea Lamark and 05 ha Hopea odorata Roxb interplanted with cajuput.

The trial was carried out on exhausted sandy soil with intensive silviculture applied to achieve improved growth. Height growth achieved was 0.94-1.04-m/ year and diameter was 1.46-1.68 cm/ year.


3. Transformation of Acacia hybrid pulpwood plantation from paper material production into plantation for sawn wood production by thinning

(Nguyen Thanh Minh)

Acacia hybrid is grown over large areas for multiple purposes such as pulpwood and particle board production. However, Acacia hybrid logs of large diameter are also used for carpentry, laminated board etc, thus thinning of plantations with a view to transform these from paper material into forests for production and sale of sawn timber can play a significant role in solving the demand for timber. Experimental results show that annual average diameter growth of plantations thinned to retain 500 trees/ha is 0.57 ha, which is 33% higher in comparison with an unthinned control with 1300 trees/ha. It is expected that after 8 years the average diameter in the thinned plantation will satisfy the standard for sale for sawn timber.


4. Technical research on natural regeneration and Acacia mangium Wild after logging in the Southeast

Acacia mangium Wild is one of main species for tree planting in Vietnam and other countries. Its good points are fast growth, suitablility for many ecological regions, and the capacity of natural regeneration from seeds. Nowadays, after logging, people often replant with other tree species or with Acacia mangium but they don’t take advantage of natural regeneration from seeds of Acacia mangium for forest regeneration.

Research is being undertaken to study technical methods for Acacia mangium regeneration by natural means from seeds with low cost but still achieving high economic efficiency.


5. Some results of a project on Anacardium occidentale L in the southeast

After 4 consecutive years a project on development of Anacardium occidentale L in the period 2000-2005 in three provinces of southeast Vietnam (Binh Duong, Binh Phuoc and Tay Ninh) by the Center for Forest Science and Production has achieved the following significant results:

– Surveying and selecting 120 Anacardium occidentale L mother trees with good traits in provinces of the southeast.

– Planting a trial garden and collecting Anacardium occidentale: as a first step, it’s been shown that clones grow well.

– Training and transferring advanced techniques in breeding and cultivation of Anacardium occidentale organizing 10 training courses, and establishing some Anacardium occidentale L model plantations in the region.

– The Center cooperated with a television station and the Department of Agriculture and Rural Development of Binh Phuoc province to make a video film on techniques for growing Anacardium occidentale which was broadcast on the agricultural extension program. In addition, many reports relating to Anacardium occidentale L growing techniques have been printed.


6. Some results on selecting eucalyptus breeds with high productivity and disease resistance for plantations in the southeast

(Nguyen Van Chien and Nguyen Hoang Nghia)

Eucalyptus is one of the main trees for afforestation in Vietnam. Its strong points are fast growth and suitability for different ecological areas. In recent years, eucalyptus has been affected by a fungal disease at different levels around the world. In Vietnam, this disease of eucalyptus appears to be present on a national scale. In the southeast in particular, the disease appears early and develops rapidly, so, besides suitable planting methods, it’s necessary to select disease resistant varieties. Researchers at the Centre for Forest Science and Production in the southeast have spent a long time in selecting eucalyptus systematically and up to now there are many breeds of eucalyptus with high productivity as well as disease resistance. These eucalyptus varieties have been accepted by the Ministry and produced on a wide scale using tissue culture techniques, and by cutting propagation with some approved varieties.


7. Some research results on improving efficiency of techniques for cuttings of Acacia hybrids for afforestation in the Southeast

(Nguyen van Chien, Doan Cong Chinh and Phan Van Huong)

The technique of propagating Acacia hybrids by cutting is applied widely to provide seedlings for plantations in Vietnam. The Centre for Forestry Science and Production in the Southeast has carried out research on improving the efficiency of cuttings techniques for Acacia hybrids and these improved techniques have brought remarkable benefits for forest owners. Cuttings propagation procedures have been simplified by using outdoor cutting propagation which has lower facilities and investment costs and lower prices than indoor cutting propagation. It is convenient for seedling production on a large scale for thousands of seedlings, and contributes to speeding up high quality afforestation nationwide.


8. Provenance trials and experiments on cuttings of Eucalyptus pellita P

(Dang Phuoc Dai)

Initial growth results show that some provenances of Eucalyptus pellita P have prospects for afforestation in the southeast. As well as having good growth features, some provenances have shown disease resistance.

Eucalyptus pellita can be propagated by cuttings. If the mother trees are still young, cuttings will have more roots. The ability to develop roots depends on the physiological state of the mother trees.


9. Trang Bom botanical garden

(Nguyen Tien Dai)

Trang Bom botanical garden was founded in 1905 by Dong Duong Irrigation and Forestry under French rule. Trees were planted in the garden until 1944. Despite many changes in fortune the garden still exists today and serves as a place for conservation of botanical varieties, research, study and for visitors. However, it needs to be upgraded and consolidated.


10. Technical advances in forest tree breeding in the Southeast

(Nguyen Tien Dai and Nguyen Van Chien)

Cultivar development is one of the primary means to improve plantation productivity. During the last two decades in the Southeast, there has been much research on selecting and improving forest trees, mainly Eucalyptus and Acacia. Advances in terms of plus tree selection, cuttings propagation techniques and transferring these into production with high economic benefits for forest growers contribute significantly to programs for afforestation in the Southeast.

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