【摘要】 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～-0.08MPa和-0.07～-0.02MPa;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-0.48～-0.24MPa和-0.18～-0.07MPa;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～-0.48MPa和-0.78～-0.18MPa。植物水分分级管理有利于提高水分利用效率,节约水资源。更多还原

【Abstract】 Water controlling experiment was conducted to study the transpiration rate of Poa pratensis and three shrubs including Euonymus japonicus、Ligustrum×vicaryi、Sabina procumbens by pot experiment and microlysimeter under soil moisture stress. Grade of water supply of these plants was divided into three grades: super grade, grade 1 and grade 2 according to observation 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.更多还原