干旱胁迫对臭椿苗木蒸腾耗水日变化的影响

Daily variation of transpiring water consumption of seedling of Ailanthus altissima under different drought stress

在盆栽、温室环境下,采用精密电子天平,研究水分胁迫条件下,几个臭椿种源幼苗的日耗水量变化规律,结果表明:几个臭椿种源幼苗的日耗水高峰期出现在中午12:00～16:00间;在土壤湿润条件下,白蜡幼苗(对照)的日耗水量最大(80 g/株),而河南宝丰臭椿种源幼苗的日耗水量最小(50.8 g/株);随着盆栽土壤含水量的降低,幼苗的日耗水量显著降低,但山东鲁中、河南宝丰种源幼苗的日耗水降低较小.

Under pot-cultivation and greenhouse condition, daily variation in transpiring water-consumption of four seedlings of Ailanthus altissima were studied by using Precision Electronic Balance. The result showed that the peak of daily water consumption of the seedlings occurred during 12：00 pm to 16：00 pm. The value of daily water consumption of the seedling of Fraxinus americana L. was biggest than others which was 80g per individual, but the value of daily water consumption of the seedling of Henan Baofeng provenance was smallest which was 50. 8 g per individual. The daily water consumption was reduced largely when the soil water content was reduced, but the reducing of daily water consumption of the seedlings of Shandong Luzhong and Henan Baofeng provenance were smaller.