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Non-linear response of stomata in Pinus koraiensis to tree age and elevation.
Zhou Y. M., Schaub M., Shi L. X., Guo Z. L., Fan A. A.,(2012)
in Trees 26:1389–1396. doi: 10.1007/s00468-012-0713-8 –
Knowledge on variations in stomata is useful in reflecting leaf physiological characteristics of CO2uptake and water transpiration, and predicting the responses of plants to future climate change.
Stomatal density and number of stomatal rows (current-year, 1- and 2-year-old needles) in relation to tree age (ranging from 25 to 320 years old), elevation (ranging from 738 to 1,380 m a.s.l.), and sun exposure (sun and shade exposure) were investigated in Pinus koraiensis trees.
Stomatal density and number of stomatal rows in relation to tree age and elevation showed a humped curve with the maximum values at intermediate levels of tree age (210 years old) and elevation (1,050 m a.s.l.), respectively. Needle age but not sun exposure significantly affected the stomatal density across tree ages and elevations. Our results suggest that variations in stomatal density of Pinus koraiensis needles are related to ontogenetic growth and environmental factors.