用盆栽和蒸散皿分别对大叶黄杨、金叶女贞、铺地柏3种灌木和草地早熟禾进行控水试验，测定土壤干旱胁迫过程中植物的蒸腾速率，观测外貌变化，据此将4种灌草植物的水分管理分为特级、一级和二级。特级为充分供水，植物生长旺盛，灌木和草坪的土壤水势分别为-0.24～-0.08 Mpa和-0.07～-O.02 Mpa；一级为轻度缺水，植物蒸腾减弱，但生长正常，外观未见明显的干旱胁迫症状，灌木和草坪的土壤水势分别为-O.48～-0.24 Mpa和-0.18～-0.07 Mpa；二级为中度缺水，植物出现短暂萎蔫，但对观赏效果影响不大，灌木和草坪的土壤水势分别为-1.41～-0.48 Mpa和-0.78～-0.18 Mpa。植物水分分级管理有利于提高水分利用效率，节约水资源。
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．
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