Linking Leaf Functional Traits with Plant Resource Utilization Strategy in an Evergreen Scrub Species Rhododendron caucasicum Pall. along Longitudinal Gradient in Georgia (The South Caucasus)

Jana Ekhvaia; Arsena Bakhia; Zezva Asanidze; Tornike Beltadze; Otar Abdaladze

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자료유형: 학술저널

저자정보: Jana Ekhvaia (Institute of Ecology School of Life Sciences and Medicine Ilia State University Georgia) Arsena Bakhia (Institute of Ecology School of Life Sciences and Medicine Ilia State University Georgia) Zezva Asanidze (Institute of Ecology School of Life Sciences and Medicine Ilia State University Georgia) Tornike Beltadze (Institute of Ecology School of Life Sciences and Medicine Ilia State University Georgia) Otar Abdaladze (Institute of Ecology School of Life Sciences and Medicine Ilia State University Georgia)

저널정보: 강원대학교 산림과학연구소 Journal of forest and environmental science Journal of forest and environmental science 제38권 제2호

발행연도: 2022.6

수록면: 110 - 121 (12page)

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Leaf functional traits widely have been used to understand the environmental controls of resource utilization strategy of plants along the environmental gradients. By using key leaf functional traits, we quantified the relationships between leaf traits and local climate throughout the distributional range of Rhododendron caucasicum Pall. in eastern and western Georgian mountains (the South Caucasus). Our results revealed, that all traits showed high levels of intraspecific variability across study locations and confirmed a strong phenotypic differentiation of leaf functional variation along the east-west longitudinal gradient in response to the local climate; out of the explored climatic variables, the moisture factors related to precipitation and number of precipitation and dry days for winter and growth seasons were more strongly related to leaf trait variation than the elevation and air temperature. Among studied leaf traits, the leaf specific area (SLA) showed the highest level of variability indicating the different resource utilization strategies of eastern and western-central Rh. caucasicum individuals. High SLA leaves for western-central Caucasian individuals work in relatively resource-rich environments (more humid in terms of precipitation amount and the number of precipitation days in winter) and could be explained by preferential allocation to photosynthesis and growth, while eastern Caucasian samples work in resource-poor environments (less humid in terms of precipitation amount and the number of precipitation days in winter) and the retention of captured resources is a higher priority appearing in a low SLA leaves. However, more evidence from a broader study of the species throughout its distribution range by including additional environmental factors and molecular markers are needed for firmer conclusions of intraspecific variability of Rh. caucasicum.

#Rhododendron caucasicum #the South Caucasus #intraspecific leaf trait variation #leaf specific area (SLA) #climate growth response #longitudinal moisture gradient

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