دورية أكاديمية
PECULARITIES OF THE TRITATED WATER TRANSPIRATION FLUX DURING WILLOW VEGETATION
| العنوان: | PECULARITIES OF THE TRITATED WATER TRANSPIRATION FLUX DURING WILLOW VEGETATION |
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| المؤلفون: | Dolin V., Bobkov V. |
| المصدر: | Геохімія техногенезу, Vol 4, Iss 32, Pp 50-57 (2020) |
| بيانات النشر: | National Academy of Sciences of Ukraine, Institute of Environmental Geochemistry, 2020. |
| سنة النشر: | 2020 |
| المجموعة: | LCC:Geology LCC:Chemistry |
| مصطلحات موضوعية: | tritiated water, white willow, transpiration, intercellular sup, organically bounded tritium, vapors from leaves, concentration, Geology, QE1-996.5, Chemistry, QD1-999 |
| الوصف: | In the greenhouse experiment in time dynamics the peculiarities of tritiated water transpiration flux from an aqueous feeding solution to the white willow (Salix alba L.) tissues were studied. The experimental results are analyzed from the standpoint of chemical kinetics. From the experimental data, the rate constants of the processes of tritium removal by the biogenic flow from the aquatic food environ-ment, its entry into the intracellular sap of wood and leaves, and transformation into an organically bound form were calculated. Up to 70% of tritium absorbed by plants from the aqueous feeding solution takes part in the transpiration-assimilation cycle through the aquatic tissues of the plants; about 30% evaporates through the leaves into the atmosphere. The water of the nutrient medium rises up through the plant by the transpiration flux at high speed (1.6 ± 28% mg×s–1) rises along the xylem by the plant. Within two weeks, the concentration of tritium in the intercellular sap of different parts of the trunk is almost equalized. In the leaf during photosynthesis, the main process of fractionation of hydrogen isotopes occurs. The tritium concentration in the leaves is significantly lower (29%) than in the trunk due to transpiration into the atmosphere through the stomata and cuticle. The obtained data testify to the "threshold" mecha-nism of tritium assimilation in the organic phase of the plants and the cyclicity of the migration processes in the aqueous phase of the living matter. The organically bound tritium concentration reaches a maximum value (7% of the activity of water in the aqueous feed-ing solution) during the first week, then decreases and equalizes in all parts of the trunk. Using a radioactive marker (tritiated water) the specific velocity of the ascending xylem flux of water in the white willow seedlings is assessed to (9.5±0.3)×10–5g×s–1 |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English Russian Ukrainian |
| تدمد: | 2664-3936 2664-3944 |
| Relation: | http://znp.igns.gov.ua/en/4-32-5-pecularities-of-the-tritated-water-transpiration-flux-during-willow-vegetation/; https://doaj.org/toc/2664-3936; https://doaj.org/toc/2664-3944 |
| DOI: | 10.15407/geotech2020.32.050 |
| URL الوصول: | https://doaj.org/article/6d777251f6844f92a8d50c6b2f778283 |
| رقم الأكسشن: | edsdoj.6d777251f6844f92a8d50c6b2f778283 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 26643936 26643944 |
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| DOI: | 10.15407/geotech2020.32.050 |