Natural regeneration of acacia plantations In the northern provinces of vietnam

April 7, 2005 by

This Thematic Report on the current situation of natural regeneration of Acacia plantations in the Northern provinces of Vietnam is the outcome of the Contract No. REN/CON/SC-0402-01-1 carried out by a group of silviculturists within the scope of the JICA Project on Rehabilitation of Degraded Natural Forests in the Da River Watershed (RENFODA).

 

The Contract term is 1 month with the following 4 activities:

Ø Survey on the existing Acacia plantations in the Northern Vietnam,

Ø Identification of natural regeneration potential of these plantations,

Ø Gathering information on the condition for natural rehabilitation of Acacia plantations,

Ø Recommendations on further activities to prepare guidance on facilitation of Acacia plantation natural regeneration.

As a result, the survey team assumes to produce a final report containing compiled data (including tables of data and field photos)

Survey methodology:

Ø Collection of information provided by major forestry management agencies (DARDs, Sub-DFs, SFEs, forest companies, project management boards etc.) through questionnaire to verify plantations of various varieties of Acacia during the last 15 years (1998 – 2003) in term of planted area, felling, yearly natural regeneration and regeneration potential, felling season, cutting techniques, flowering and fruiting season and other possible silvicultural interventions as defined in Annex 1.

Ø Region and pilot-site field survey to get information on natural conditions, current status of plantations, natural regeneration and so on. At the same time, the survey team will also conduct interviews and dialogues with local staffs and forest holders as well as take photos and estimate different parameters through eye estimation and rapid measurement of plantation indicators.

Ø Inventory and measurement of sample plots:

· Inventory of permanent sample plots applied for different varieties of Acacia, plantation formations, site conditions at the area of 1 ha per plot (100 x 100 or 50 x 200m) and of sub-plots as well.

· Sub-plots have been established at random. Sample plots have been divided in equal lines and sub-plots identified evenly. Of this, 30 – 35 sub-plots of regenerated stands of 6 months – 1 year old with the area of 1 m2 each are measured. With the regenerated stands of 2 – 4 years old, 5 sub-plots of the area of 4 m2 each are measured.

· In the sub-plots number of stems is accounted and the height of the regenerated trees is estimated.

 

Ø Collected data then have been analyzed to verify typical characteristics of stands, their natural regeneration features and relations amongst different variables using generally applied methods.

 

The data that have been collected are as below:

 

1. Records of plantations with various Acacia species in different localities,

2. At total 17 sites have been surveyed,

3. Field visits have been expedited to 17 selected districts of 4 provinces.

4. The total number of managerial and technical staffs, household heads and representatives of research institutions is 20 (Annex 4),

5. 50 photos have been taken (Annex 5),

6. Number of surveyed plots: 30 (Annex 6),

7. Measured sub-plots: 330 sub-plots of 1 year old, 100 sub-plots of 2 – 4 years old (Annex 6) have been investigated at different naturally regenerated stands.

 

The main contents of the Thematic Report (Final Report) cover the following items:

 

1. Background

2. An overview of Acacia as planting species and Acacia plantations in Vietnam

3. Present status of natural regeneration of Acacia plantations in the Northern provinces of Vietnam

4. Specific characteristics of Acacia plantations natural regeneration

5. Conclusions and proposals

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