Особенности водного обмена деревьев защитной примагистральной лесополосы в условиях степной зоны Украины

• Main Authors: ПОНОМАРЁВА Елена, БЕССОНОВА Валентина
• Format: Article
• Language: English
• Published: Moldova State Agrarian University 2019-06-01
• Series: Stiinta Agricola
• Subjects: woody plants; water holding capacity; transpiration; water regime; protective roadside shelterbelts
• Online Access: https://sa.uasm.md/index.php?journal=sa&page=article&op=view&path%5B%5D=674

The water-holding capacity and the intensity of transpiration of the leaves of trees was investigated in shelterbelts near the track M-18 (between the cities of the Dnepr and Zaporozhye on southeast of Ukraine). It was found that from June to September the water-holding capacity of Armeniaca vulgaris, Robinia pseudoacacia, Ulmus parvifolia, Populus alba leaves increased most significantly. The average daily seasonal dynamics of transpiration in all species, except for Juglans regia, is characterized by a decrease in the intensity of this indicator by the middle of summer against the backdrop of increased drought. At the end of the growing season, on the background of a significant lack of water in the soil and high air temperatures, Acer platanoides and Ulmus glabra increase transpiration activity. In other species, the evaporation rate either decreases (Populus alba, Aesculus hippocastanum, Armeniaca vulgaris, Juglans regia), or almost does not change (Acer saccharinum, Tilia cordata, Acer negundo, Ulmus parvifolia, Fraxinus lanceolata, Robinia pseudoacacia). On the background of sufficient moisture content in the soil in almost all species, the maximum evaporation occurs during the daytime hours (11-14 hours), except for Acer negundo and Acer platanoides, which transpiration is maximum in the morning. During drought in some species the greatest water losses occur in the morning and evening (Ulmus glabra, Tilia cordata, Robinia pseudoacacia). Fraxinus lanceolata and Ulmus parvifolia evaporate moisture only in the evening, while Armeniaca vulgaris, Populus alba, Juglans regia and Acer saccharinum have a low intensity of transpiration throughout the day.