New approach for measuring low sap velocities in trees

Becker, 1998, Limitations of a heat pulse velocity system at low sap flow: implications for measurements at night and in shaded trees, Tree Physiol., 18, 177, 10.1093/treephys/18.3.177 Burgess, 2001, An improved heat pulse method to measure low and reverse rates of sap flow in woody plants, Tree Physiol., 21, 589, 10.1093/treephys/21.9.589 Carslaw, 1959 Green, 2003, Theory and practical application of heat pulse to measure sap flow, Agron. J., 95, 1371, 10.2134/agronj2003.1371 Orgaz, 2007, A model of daily mean canopy conductance for calculating transpiration of olive canopies, Funct. Plant Biol., 34, 178, 10.1071/FP06306 Ren, 2000, Determining soil water flux and pore water velocity by a heat pulse technique, Soil Sci. Am. J., 64, 552, 10.2136/sssaj2000.642552x Swanson, R.H., 1962. An instrument for detecting sap movement in woody plants. Paper 68, USDA Forest Serv. Rocky Mountains Forest Range Exp. Stn., Fort Collins, CO. Swanson, 1981, A numerical analysis of heat pulse velocity theory and practice, J. Exp. Bot., 32, 221, 10.1093/jxb/32.1.221