Do Dinh Sam, Pham Van Tuan, Bui Doan, Tran Quang Viet, Tran Van Con, Ngo Que, Do Doan Trieu, Nguyen Anh Dung, Pham Ngoc Mau.
The National Research Project to develop “Silvicultural treatments to support the five -million hectare plantation programme and an eventual ban of timber extraction from natural forest” was carried out by the FSIV for three years (1997 – 2000). The main sites of study were planned to be Huong Son (Ha Tinh), Ba Ren (Quang Binh), Kon Ha Nung (Gia Lai) for natural forests, and Dai Lai (Vinh Phuc), Dong Ha (Quang Tri), Pleiku (Gia Lai), Bau Bang (Eastern South Vietnam) for established forest plantations.
I. Additional Scientific Information to Improve Silvicultural Treatments for Higher Yields of Natural Forests under Regeneration
1. “States” of Natural Forests under Regeneration
Natural forests in Vietnam are extending over 9.4 million hectares, 60% of which are poor ones, bearing only low standing timber volumes. There are the results of abusive timber extraction, going beyond the M.A.I of the stands and repeatedly recurring on exactly the some plots time after time. The forests therefore have experienced lots of serial stages, which are often disturbed by local people in need of forest products, so to turn all of them into very complex vegetation cover formations, now being refereed to as “states” in practical forestry. It is time to develop methods leading to the elaboration of improved silvicultural treatments for higher yields of natural forests under regeneration first of all to develop methods for the description and classification of the forest states as mentioned earlier.
By now, forest practitioners are using the classification of “forest states” as devised by Loschaw (dividing the forests under study into “logging” types of I, II, III and IV) with some extra information related to forest tree standing volume.
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