SOME ASPECTS OF GROWTH AND DEVELOPMENT OF SELF-SEEDING Dipterocarpus turbinatus C. F. GAERTN (1805) (SOUTHEAST VIETNAM)
Southern Branch of Joint Vietnam-Russia Tropical Science and Technology Research Centre
Southern Branch of Joint Vietnam-Russia Tropical Science and Technology Research Centre
Số điện thoại: 0913145914; Email: thinh39b@gmail.com
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Tóm tắt
The paper presents studies related to the growth and development of self-seeding Dipterocarpus turbinatus C. F. Gaertn (1805), which grows in the Cat Tien National Park (Southeast Vietnam) under natural conditions. It is shown that the main limiting factors influencing the vital activity of self-seeding are air humidity, illumination and water supply. Some features of seedling development are revealed. The root growth rate was determined to be ~ 1.5 cm/day, and the stem growth rate was 4 - 5 cm/day. It is shown that the formation of the seedling occurs due to the nutrients of the endosperm and lasts for 10 - 12 days. In conditions of insufficient illumination, the seedlings reach a certain height and turn into "sticking out sticks". Approximately in the second year, self-seeding falls out. It was revealed that self-seeding is characterized by a high growth rate of photosynthesis at low PAR values. The optimum air temperature for the processes of photosynthesis and transpiration of seedlings is 28 ± 1°C. With an increase in the concentration of CO2 in the air, of photosynthesis naturally increases.
Từ khóa
Endosperm, fruit, photosynthesis, photosynthetically active radiation, transpiration, water supply, nội nhũ, quả, quang hợp, bức xạ hoạt động quang hợp, thoát hơi nước, cấp nước
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Tài liệu tham khảo
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