Determination of the transpiration intensity of

One of the key indicators characterizing a plant’s water regime is the intensity of transpiration, the magnitude of which provides insight into water expenditure under different ecological conditions. The aim of this study is to examine the transpiration intensity and water retention capacity of Sambucus nigra L. leaves growing in the Vanadzor area under different ecological conditions. The research of Sambucus nigra L. in the Lori region was conducted both through route surveys and stationary observations at altitudes ranging from 900 to 1500 meters above sea level. The study sites were selected in locations where the main populations of the species are found. The transpiration intensity of the Sambucus nigra L. plant varies depending on environmental conditions. During the flowering stage, the transpiration intensity is higher than during to the fruiting stage. The impact of ecological conditions on the intensity of transpiration as well as the relative transpiration is significant. There is an inverse proportional relationship between soil moisture content and the plant’s water retention capacity: the higher the soil moisture, the lower the plant’s ability to retain water and vice versa.