The effects of shading and composition of container medium on the survival and growth of Michelia tonkinensis A.chev seedlings
Keywords:
composition of container mediu, Michelia tonkinensis A.Chev, seedling, shadingAbstract
Michelia tonkinensis A.Chev is multiple-purpose and high value tree species in Vietnam. This research evaluated the effects of shading regime and compositions of container medium on survival rate and growth of the seedlings. The experiment was designed by a method of randomized complete block with 3 replications for two separate factors: shading with 5 levels (control, 25%, 50%, 75% and 100%) and the 5 different compositions of container medium. The result showed that shading had significant effect on survival rate (%), the collar diameter ( Do), and top height (Hvn) of the seedlings and varied with the age of seedlings in nursery. The optimum shading level was at 75% in the period of 4 months, and at 50% in the period of 6 to 8 months. The factor composition of the container medium in this research had no significant influence on the survival rate of the seedlings, but significantly affected on the collar diameter and height of the seedling. The best medium composition was made of 95% of top soil and 5% of mixed humus and microorganism fertilizer in terms of container volume percentage
References
1. Bộ Nông nghiệp và PTNT, 2006. Tiêu chuẩn ngành 04-TCN-130-206 - Quy phạm kỹ thuật trồng rừng Giổi xanh (Michelia mediocris Dandy).
2. Hoang., 2008. Uses and conservation of plant species in a national park - A case study of Ben En national park, Vietnam. Economic Botany, 62(4): 574-593.
3. Lê Đình Phương, 2013. Nghiên cứu một số đặc điểm sinh vật học và kỹ thuật gieo ươm loài Giổi ăn quả(Michelia tonkinensis A.Chev.) tại Vườn quốc gia Bến En, tỉnh Thanh Hóa. Luận văn thạc sĩ khoa học Lâm nghiệp, Trường Đại học Lâm nghiệp.
4. Schmidt. L, 2000. Guide to handling of tropical and subtropical forest seed, Danida Forest Seed Center.
5. Trần Văn Đô., 2008. Ảnh hưởng của kỹ thuật gieo ươm tới sinh trưởng cây con Giổi bắc (Michelia macclurei Dandy). Tạp chí Khoa học Lâm nghiệp, số 3/2008: 687-692.
6. Triệu Văn Hùng, 2007. Lâm sản ngoài gỗ Việt Nam, Dự án hỗ trợ chuyên ngành lâm sản ngoài gỗ tại Việt Nam - Pha II.
7. Thimothy P.C.E., 2012. Differential growth responses in seedlings of ten species of Dipterocarpaceae to experimental shading and defoliation. Journal of Tropical Ecology 28: 377-384.
