Characterictic of stand structure and regeneration of Lithocarpus pseudosundaicus (Hickel et A.Camus) Camus in some Northern moutainous provinces
Keywords:
Structure and regeneration, Lithocarpus pseudosundaicus (Hickel et A.Camus) Camus, the Northern moutainous areaAbstract
The study has been carried out in natural forests in 8 provinces of Bac
Giang, Ha Giang, Ha Noi, Cao Bang, Hoa Binh, Lao Cai, Tuyen Quang,
and Vinh Phuc, where De xanh naturally occurs. The result shows that
Lithocarpus pseudosundaicus (Hickel et A.Camus) Camus generally
distributes at the altitude of 100 - 700m of 4 natural forests of IIA, IIB,
IIIA1 and IIIA3, but focuses mainly in the IIA and IIB, at the altitude
lower than 500m. The forest canopy has 3 main layers with the shadin level is 0.5 - 0.7. The general characteristic of the high plant layer: the
density is 468 - 1,044 trees/ha; 15 - 34 species, of which 3 - 13 species
join mainly the species structure fomular with the species structure index is 5.0 - 29.3%. Lithocarpus pseudosundaicus density is rather low, from 4- 84 tree/ha, and normally occurs in a group of 2 - 5 trees. They distributes strongly at the altitude of 100 - 300m, with the density of 44 - 84 trees/ha. The regeneration density of the natural forests, where Lithocarpus pseudosundaicus occurs, is from 1,680 - 4,000 seedlings/ha; with 14 - 25 species, of which 4 - 9 speices join mainly the species structure formula; 79.7% regeneration seedlings were born by seed, 20.1% by buds. The rate of bad regeneration seedlings is 9.3%; the rate of potential seedlings having height to be higher than 2m is 12.2%. The density of Lithocarpus pseudosundaicus seedlings is 80 - 400 seedlings/ha, of which 82.7% were born by seeds, 17.3% were by buds; the rate of bad seedling of Lithocarpus pseudosundaicus is 6.6%; the rate of potential seedlings of Lithocarpus pseudosundaicus is only 6.1%. It is, therfore, necessary to apply appropriate silvicultural methods such as to remain good Lithocarpus pseudosundaicus parent trees to produce seeds, to thin un -valuable trees and seedlings... to improve the quality of forest, contributing to the improvement of quality and productivity of natural forests in the study area
References
1. Lê Mộng Chân, Lê Thị Huyên, 2000. Thực vật rừng Việt Nam. NXB Nông nghiệp, Hà Nội.
2. Lương Thế Dũng, 2017. Nghiên cứu kỹ thuật gây trồng Máu chó lá to (Knema pierrei Warb.), Chò xanh (Terminalia myriocarpa Huerch), Dẻ xanh (Lithocarpus pseudosundaicus (Hickel et A.Camus) Camus) cung cấp gỗ lớn cho khu vực phía Bắc. Báo cáo tổng kết đề tài. Viện Khoa học lâm nghiệp Việt Nam.
3. Nguyễn Hải Tuất, Vũ Tiến Hinh, Ngô Kim Khôi, 2006. Phân tích thống kê trong Lâm nghiệp. Nhà xuất bản Nông nghiệp, Hà Nội
