中文摘要：

在适宜土壤水分（70％θf）、中度干旱（50％θf）和严重干旱（30％θf）等3种土壤水分条件下，研究黄土高原常见造林树种刺槐（Robinia pseudoacacia）的蒸腾特性及抗旱适应性。结果表明，刺槐的蒸腾速率与土壤含水量密切相关，其总耗水量、总生物量的大小均为适宜土壤水分〉中度干旱〉严重干旱，但总WUE在中度干旱下最高，严重干旱下最低；刺槐蒸腾速率的日变化是环境因子综合作用的结果，其中大气因子对刺槐蒸腾速率的影响主要受土壤水分含量的控制。在干旱条件下刺槐的抗旱性与SOD活性有一定的关系，但与K^＋含量之间无明显对应关系。刺槐属于耐旱性强的高耗水树种。

英文摘要：

Transpiration and drought resistance of locust （Robinia pseudoacacia）,a common afforestation tree species an the Loess plateau were studied under 3 soil water treatments ： suitable ,medium drought and severe drought accounting for about 70%,50% and 30% of field capactity （θi）respectively, the results showed the transpiration rate of locust leaves was closely related to the soil water content. The total water consumption and to tall biomass in 3 soil water treatments were in the order of suitable water content 〉 medium drough 〉severe drought . The total water use efficiency however,was the highest in medium drought treatment ,the lowest in severe one. Changes of transpiration rate were the results of combined actions of environmental factors in the daytime ,among them,the effect of atmospheric factor on the transpiration was controlled by soil water content. Under drought conditions ,the drought resistance of locust was correlated with supperoxide dismutase activity in a certain extent but not with the content of potassium ion. It was concluded that locust was not a suitable tree species to be planted widely on the Loess Plateau, but suitable in the soil with favorable water condition.