Information on Forest Science and Technology Number 2 2004

July 5, 2006 by

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

1. Productivity of Acacia hybrid plantations in eastern South Vietnam and problems concerning techniques and site

Pham The Dung, Pham Viet Tung and Ngo Van Ngoc

A survey on productivity of Acacia hybrid plantations in three forest production units in eastern South Vietnam at the Xuyen Moc forest enterprise (Ba Ria-Vung Tau) and South Vietnam paper raw material company (Binh Phuoc) carried out in May 2003 showed that productivity of Acacia hybrid plantations varies greatly depending on planting site and planting density. On reddish soil, growth is better than on infertile greyish soil, using a planting density of about 1,111 trees/ha. Acacia hybrids grow fast in the first three years and then the growth rate slows. Herbicide spraying is recommended and the technique must be further studied in detail. “Advanced burning” of the ground vegetation under acacia plantation canopy for fire control will reduce soil fertility and is also very risky. Research is needed for more sustainable management.


2. Research on the capability of amelioration of the micro-environment of Camellia sasanqua Thumb. plantation on sandy soil in the Binh Tri Thien coastal region.

Dang Thai Duong

Research on the capability of environmental protection of C. sasanqua plantation as a base for the planting, tending and thinning aimed at raising the protection value of C. sasanqua plantation and bush vegetation on sand is very important. Research results on the capability of C. sasanqua plantation and bush vegetation on sand in the Binh Tri Thien region shows that:

– Less than 100 m (about 20 H) behind the belt, the protection effectiveness of thin bush vegetation on sand is 29%; rather closed bush vegetation on sand is 35-39% and closed bush vegetation on sand is 31%.

– Mean air temperature is 2, 5-30C less than that in the open.

– Mean air humidity is 3-5% higher than that in the open.

– Mean radiation is 86% less than that in the open.


3. Evaluation of the condition of acacia and eucalypt plantations in Vietnam in recent years

Eucalypt and acacia are the main plantation species grown in Vietnam in recent years. The area planted with eucalypt and acacia up to the end of 1999 represented a major part of the country’s total forest plantation area (46.09%). In the 2000-2003 period, although the area planted with single species is not known, acacia and eucalypt are key species in the 5 million ha reforestation programme and in the focussed regional forest plantings for raw material supply. Most of the existing forest plantations are extensive with low productivity, only 7-10m3/ha/yr. Especially with E. camadulensis, mean productivity is only 4-5 ha/m3/yr. In recent years, due to technical advances in raising planting stock quality, and in establishment of intensive forest plantations, plantation productivity in many places has already reached 20m3/ha/yr. Acacia hybrids, in particular, in an experimental planting in eastern South Vietnam can attain over 33m3/ha/yr. Almost all the raw materials supplied to wood processing plants and pulp and woodchip production for export at present are from acacia and eucalypt.

Thus, acacia and eucalypt are species which have assumed an important position in the structure of forest planting species in Viet Nam over a number of year. They are not only species for revegetation of bare land and denuded hills but they also constitute the main sources of raw material supply serving the paper, fibre and composite board industries, contributing no small part to the development of the national economy.


4. Site classification of coastal sandy soil

Dang Van Thuyet

Based on topography, morphology, water regime, soil type and plant indicators, the coastal sandy region of North Central Vietnam is classified into 3 site groups with 21 types. Group I (shifting sand dunes) and group II (fixed sand dunes) have 8 site types without water logging, deep water tables and which are difficult for production. Group III is a fixed sandy area with 13 site types, the water regime is more favourable, some site types are without water-logging (IIIA5c, IIIA6c), and some types are water-logged such as IIID9d, IIID,IIIC8d. This is a group of site types more favourable for agricultural production. Thus the use of group I and II is mainly directed to protection forest establishment and group III is mainly for agricultural production combined with environmental protection.


5. The ownership of natural forest

Vu Long

According to the draft revised forest protection and development law, natural forest is owned by the state. But based on the characteristics of the forest and present forestry practice not all natural forests are owned by the state. The ownership of some areas lies in other economic sectors. Improvement of the forest economic structure in the direction of socialization of forestry careers will create favourable conditions for natural forest and forestry development.


6. Economic effectiveness of Cinnamomun cassia planting in an agroforestry system (Cinnamamum cassia + cassava) in Van Yen, Yen Bai

Tran Duy Ruong and Tran Viet Trung

The paper points out the effectiveness of planting C. cassia in Van Yen district, Yen Bai province. Plantings of C.cassia bring about higher profit than other forest species. Calculations show that 1 dong spent on planting C.cassia can return a profit of 5.96 dong. Thus the C.cassia planting in Van Yen constitutes a source of high income for the local people and contributes to the protection of the ecological environment, generating employment for the people in rural areas of Yen Bai province in general and in Van Yen district in particular.


7. Models of joint undertaking in production of wood as a raw material serving the paper industry

Nguyen Thi Lai, Hoang Lien Son and Dang Dinh Khai

This paper contains some of the results of an initial study in Thanh Son district, Phu Tho province on models aimed at solving the fragmented production of raw material for the paper industry. The study’s findings show the impact of the forest and forest land allocation policy and the policy renovation of the organizational make-up and management mechanism of State-owned forest enterprises on the development of the raw material sector. To make the significance of the joint undertaking models more clearly known, the investors (Forest planting enterprises) should ascertain precisely the forest plantation productivity equivalent to the potential of each type of forest soil, select planting stock of high productivity and at the same time develop effective channels of wood raw material circulation aimed at reducing intermediary costs. A plan should then be devised to raise the initial investment rate for the households, ensuring economic benefits to further attract the participation of the households engaged in forest planting for paper raw material supply.


8. Weibull distribution in research on forest structure and method of parameter estimation

Tran Van Con


9. Cutting propagation of Cinnamomum parthenoxylon meisn. for conservation planting

NH Nghia

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