Abstract:

Water controlling experiment was conducted to study the transpiration rate of Pea pratensis and three shrubs including Euonymus japonicus、Ligustrum×vicaryi、Sabina procumbens by pot experiment and microlysimeter under soil moisturestress．Grade of water supply of these plants was divided into three grades：super grade，grade 1 and grade 2 according toobservation data．Super grade refers to sufficient water supply，under this condition plants flourish and soil water potentials of shrubs and turf are respectively-0.24～-0.08 Mpa and-0.07～-0.02 Mpa．Grade 1 means slightly water deficiency。Under this condition plants grow normally and their transpiration rates decrease without responses against moisture stress，the water potential is respectively-0.48～-0.24 Mpa and-0.18～-0.07 Mpa．Grade 2 is medium water deficiency，that is，soil water potentials are respectively-1.41～-0.48 Mpa and-0.78～-0.18 Mpa and plants appear temporary wilting without influence on ornamental effect．Controlled water supply can increase efficiency of water use and save water resource．

Key words: urban landscaping, irrigation of water saving, transpiration rate, water management, Beijing