Nguyễn Huy Sơn, Nguyễn Văn Thịnh, Bùi Thanh Hằng

Nguyễn Thanh Minh, Phan Minh Sáng

Forest Science Institute of Vietnam

Summary

Hybrid acacia in southeastern grow quite rapidly,, on average, an increment in diameter of 2.38 — 2.52cm/year and in height of 3.56 — 3.64 m/year. The standing tree volume at harvest is 136 -180m³/ha and increment is 27.2 — 36.0m³/ha/year. The increase in diameter was described by the Schumacher function with the equation:

Keywords: growth characteristic, rotation age, acacia plantation

2. Appraisal of protection forest plantations on sandy land under the Project 661 in Quang Binh province

Võ Đại Hải

Forest Science Institute of Vietnam

Summary

Afforestation in coastal sandy land is one of the most important tasks to prevent sand movement, to improve the environment and living conditions in these areas of Vietnam. This task was demonstrated in Project 661 during 1998-2005 on coastal sandy lands. This research was carried out to evaluate the effectiveness of protection plantations in the project 661 during 1998-2005 in coastal sandy land at Quang Binh province. The research showed early results of survival rates, growth in diameter, height, diameter of the leaf canopy in different situations and with different techniques. The promising models, species and methods will be the basis to propose some methods to improve the quality of 661 plantations in the period 2006-2010.

Keywords: protection forest plantation, sandy land, the project 661, Quang Binh province

3. Social criteria for sustainable forest management in the Central Highlands

Trần Văn Con

Social criteria and indicators of sustainable forest management (SFM) have often been criticised by assessors as the most difficult to assess in the field and the most ambiguous to interpret of all the proposed criteria and indicators of SFM. That is because of the difficulty of establishing absolute standards for desirable social conditions such as human well-being. This article intends to develop methods and procedures for testing the social science criteria; and the field testing of specific criteria and indicators. The intention of the study is to test the P&C&I developed by the National Working Group against our findings in the field and to revise the P&C&I accordingly.

4. Six new Melocalamus species for Vietnam

Nguyen Hoang Nghia, Tran Van Tien

Based on morphological characteristics and flower structure, nine bamboo species were described and identified, forming a new bamboo genus, namely Melocalamus genus for Vietnam. The outstanding characteristic of the Melocalamus genus is fleshy fruits. Six species were described and identified based on floral anatomy and these are: Melocalamus yenbaiensis, M.cucphuongensis, M.Kbangensis, M.blaoensis, M.pacoensis and M.truongsonensis. The keys for species identification are as follow:

A.Stigma 3

B. Style and stigmas have flat form…………Melocalamus yenbaiensis

B’. Style and stigmas have filamentous form

C.Stigmas not originated from 1 point on style..M.cucphuongensis

C’. Stigmas originated from 1 point on style

D. Stigmas have filamentous form and long ………..M.kbangensis

D’. Stigma round, big and short ….. …………… ..M.blaoensis

A’. Stigma 2

E. Stigma 2, flat form, originated from ovary ……………M.pacoensis

E’. Stigma 2, flat form, originated from style ………M.truongsonensis

Keyword: fleshy fruits, Melocalamus, identification

5. The results of a survey in Camellia sasanqua afforestation and development in the northern provinces of Vietnam

Nguyen Quang Khai, Hoang Van Thang, Nguyen Ba Van, Nguyen Van Thinh

Forest Science Institute of Vietnam

Summary

Camellia sasanqua is a species with multiple benefits. As well as products of fruit and oil from seed, it can be a good protection species. The results of a survey of Camellia sasanqua afforestation and development in the northern provinces of Vietnam showed a recent decline of Camellia sasanqua plantation area. The growth and development of Camellia sasanqua mostly depends on community experience and there are no suitable technology systems. Camellia sasanqua plantation productivity in some provinces was only 1.6-2.0 tons of seed/ha/year. Camellia sasanqua is a slow growing species but it can grow on many different sites. Camellia sasanqua also has rapid natural regeneration and regenerates through coppice,. the reason to develop Camellia sasanqua afforestation for different goals.

Keywords: Camellia sasanqua reforestation,

6. The results of research in Rhizophora apiculata plantation thinning as a basis for agriculture — forestry — fishery combination in Camau

Dang Trung Tan, Vo Nguon Thao

Forest Science Institute of Vietnam

Summary

The thinning research was done in 6 and 10 years-old plantations in Tam Giang I and Tam Giang III forest — fishery enterprise. It was done in the field with three thinning models depending on density (20%, 35%, 50%) and one control.. Three years after thinning in 6 years old forest, there are not different between the four models in forest quantity. Thinning in 6 years-old forest with an intensity of about 35% and 50% had good results in diameter and height growth. In 10 years-old forest thinning, the 50% model was different from all the others, and the 35% model had the same quantity as the two remainding models…

Keywords: thinning, Rhizophora apiculata, agriculture — forestry — fishery combination

7. Research on Acacia mangium surface colour treatment for furniture production

Bui Duy Ngoc, Nguyen Dinh Hoi, Vu Dinh Thinh

Forest Science Institute of Vietnam

Summary

The surface of Acacia mangium has poor, dark and uneven colour so it is very difficult to decorate the surface with transparent materials.. For this reason of the wood use is limited and the produce value is reduced. When using Acacia mangium to produce furniture, after detailed wood working and before produce assembly, we should colour treat the wood surface to create good conditions to further decorate the product.. There are many methods and chemicals to colour treat wood surfaces but using bleach (H₂O₂₎ with concentration 7.5% for 2 minutes, followed by kiln drying at 60⁰C for 60 minutes, have given the best results.

Keywords: Acacia mangium wood, bleach

8. Research to improve plantation wood drying

Bui Chi Kien, Tran Tuan Nghia

Forest Science Institute of Vietnam

Summary

Based on the research results for growth stress, and shrinkage of plantation wood (the reason of some defects in manufacturing) and plantation wood drying in or outside Vietnam, the author used the same methods of experimentation and and data processing to improve drying of some plantation wood such as eucalyptus, acacia auriculiformis, acacia mangium, hybrid acacia. and to develop technologies suitable for conditions in Vietnam. This drying technology was tested and had good results in the Forest Industry Technology Transfer and Research Center and has been transferred to some processing centers in the north of Vietnam.

Keywords: growth stress, plantation wood drying