Abstract:

The leaf transpiration (TR) and stomatal conductance(g_s) of 4-year-old Eucommia ulmoides in the hilly land of Taihang Mountain were measured and analyzed. The results showed that: (1) the diurnal variation of TR was demonstrated double-peak curve in clear day and cloudy to clear day, and single-peak curve in overcast day; (2) the tend of diurnal variation of g_s was almost the same as TR; (3) the values of TR showed good agreement with meteorological elements such as photon flux density(PFD), saturation vapour pressure deficit of air(D) and water surface evaporation (EV); (4) Because there was close relation between EV and TR,and the approach of measuring EV was relative simple,it was feasible that TR was estimated using data on EV.

Key words: Eucommia ulmoides, Transpiration, Stomatal conductance, Meteorological elements