干旱胁迫对7种绿化树种苗木蒸腾耗水的影响

Eeffect of Drought Stress on Evaprouation and Water Consumption in Several Tree Species

在盆栽，水分胁迫条件下，研究红叶小檗、连翘、金叶莸、水蜡、紫丁香、国槐、金叶女贞7个北方常见园林绿化树种幼苗的蒸腾日耗水量变化规律，以探讨土壤干旱胁迫对树木蒸腾耗水的影响，评价这几个树种的抗旱性强弱。结果表明：7个树种幼苗的蒸腾日耗水高峰期均出现在12：00—16：00；随着盆栽土壤含水量的降低，各树种幼苗的日耗水量显著降低，根据蒸腾日耗水量的相对变化，7个树种抗旱性由强到弱依次为：国槐〉红叶小檗〉金叶莸〉金叶女贞〉连翘〉水蜡〉紫丁香。

The effect of drought stress on evaporation and water consumtion in poting contdition of Berberis thunbergii, Forsythia Suspensa, Ugustrum obtusifolium, Syringa oblate、 Ligustrum vicaryi, Sophora japonica, Caryopteris clandonensis were studied. The result showed that the dimax time for water consumption of these trees occured at 12：00 to 16： 00. The daily water consumption of these trees seedling were decreased along with the reducing of soil water content. According to the change of daly water consumption. The rank of drought resistance of these tree species was make, which was Sophora japonica 〉 Berberis thunbergii 〉 Caryopteris clandonensis 〉 Ligustrum vicaryi 〉 Forsythia suspensa 〉 Ligustrum obtusifolium 〉 Syringa oblate.