黑莓( Rubus spp.) 赫尔( Hull) 品种扦插苗在土壤相对含水量分别为 85 %以上、70%～ 80 %、50 %～ 60%、45%～ 50%和 30 %～ 35 %的条件下处理 20 d, 以土壤相对含水量 70%～ 80%的处理为对照, 测定其叶片单个复叶的鲜重、单位叶面积鲜重、叶片相对含水量、叶绿素含量及可溶性蛋白质含量的变化。 结果表明, 当土壤相对含水量达 85 %以上时, 所测各项指标与对照相比均无显著差异, 黑莓生长良好, 说明黑莓是一种喜湿植物。 随着土壤含水量的下降, 单个复叶的鲜重极显著下降;叶片相对含水量在土壤相对含水量为 45%～ 50%时显著下降, 在土壤相对含水量为 30 %～ 35 %时极显著下降并达到受轻度胁迫的水平;而单位叶面积鲜重、叶绿素含量及可溶性蛋白质含量都比对照有不同程度的增加。
 

The fresh weight of leaf ( a compound leaf) , fresh w eight per unit area, relative water content, chlorophy ll content and soluble protein content were determined in leaves of blackberry grown in different soil relative w ater contents of >85 %, 70 %～ 80 %, 50 %～ 60 %, 45 %～ 50 %and 30 %～ 35 %for 20 day s respectively, in w hich the treatment of 70 %～ 80 %w as the check ex periment .The results showed that w hen the soil relative water content is >85 %, there were no remarkable differences of all items compared w ith the check, the plant grew fine, so it can be considered as a w ater-loving character.As the soil w ater decreased, the fresh w eight of leaf decreased rem arkably, the relative w ater content decreased too, but until the soil relative w ater content decreased to 30 %～ 35 %, the blackberry w as not under mild stress .The fresh weig ht per unit leaf area, chlorophyll content and soluble protein content all increased in different extent .