Diurnal cycles in sap flow and leaf water potential: do leaf height and species identity matter? Adarsh U.G., College of Forestry-Sirsi Akshay Surendra, NCBS-Bangalore Rishiddh Jhaveri, IISER-Pune
Flow of water in a tree: potential gradient Choat et al., 2018
Model Sperry et al., 2017
Hypotheses Diurnal cycle in sap flow and leaf-water potential There is a lag in leaf-water potential between bottom leaves and top leaves
Methods Turner 1988; Lu 1988
Trees of interest Terminalia paniculata Careya arborea Canopy species, tree height: 18.9 m Middle-storey species, tree height: 7m Bottom measurement: at 1.6 m Bottom measurement: at 3.5 m Top measurement: at 6 m Top measurement: at 7 m
Diurnal cycle of leaf water potential for two species
Diurnal cycle of leaf water potential at two heights
Comparing temperature, sap flow and leaf water potential
Key-takeways ● Diurnal pattern of a hump-shaped curve (with mid-day peak) for temperature, sap flow (2 species, 3 days) and leaf-water potential (2 species, 2 heights) ● Sap flow picks up later than leaf-water potential (sap flow follows leaf water conductance) ● Sap flow and leaf-water potential do no go to ‘zero’ by dusk (~7pm) ● Higher (negative) leaf water potential at greater height-of- leaf (terpan, cararb)
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