中文摘要：

采用盆栽试验，分别在刺槐（Robinia pseudoacacia）幼树生长初期、生长盛期和生长后期进行了5种不同土壤水分含量试验，以研究不同生长阶段内干旱胁迫对该树种干物质分配的影响。结果表明：各生长阶段内刺槐幼树茎、枝分配比率并不受土壤水分含量变化的影响，短期（15d）及中轻度干旱（70％和87．8％相对土壤含水量）胁迫对刺槐叶、地上部分干物质分配比率及根冠比的影响亦不明显；而长期（45～60d）严重干旱（40％相对土壤含水量）胁迫则显著降低了刺槐叶、地上部分配比率，提高了粗根干物质分配比率及根冠比。受树木本身生长特性和气候因素的季节性变化影响，不同生长阶段之间干旱胁迫对刺槐干物质分配的影响存在明显差异，其影响程度大小为生长初期〉生长盛期〉生长后期。

英文摘要：

A pot experiment was conducted to study the effects of drought stress on the dry matter partitioning of young Robinia pseudoacacia at its early, vigorous, and late growth stages under five soil moisture regimes （40% , 52.2% , 70% , 87.8% , and 100% of field water-holding capacity）. At any given growth stage, soil moisture regime had no significant effects on the dry matter partitioning ratio of branch and stem. Short-term （ 15 d ）, medium- and light drought stress （70% and 87.8% of field water-holding capacity） had less effects on the dry matter partitioning ratio of leaf and shoot, while long-term （45-60 d） severe drought stress （40% of field water-holding capacity） decreased this partitioning ratio significantly, and increased the course root dry matter partitioning ratio and root/shoot ratio. As affected by the inherited growth characteristics of R. pseudoacacia itself and the variation of weather conditions among seasons, drought stress had different extents of effects on the dry matter partitioning of young R. pseudoacacia at its different growth stages, with the most significant effect occurred at early growth stage and the least at late growth stage.