水分胁迫对费菜和长药八宝生长及生物量分配的影响

 研究了土壤水分胁迫对景天属植物费菜（Sedum aizoon L.）和长药八宝（Sedum spectabilis Boreau）的生长以及生物量分配的影响。结果表明：两种植物的生长及生物量分配状况均受土壤水分胁迫的影响。随着水分胁迫的加剧，费菜和长药八宝的株高、叶片数量、单株总叶面积及生物量增量总体均呈下降趋势，且费菜生长受抑制程度高于长药八宝；生物量分配比例发生变化，根冠比总体表现为先上升后下降。此外，水分胁迫还降低了植株含水量，费菜的降低幅度远大于长药八宝。研究表明，长药八宝较费菜更能适应干旱胁迫环境。

Effects of Soil Water Stress on Growth and Biomass Distribution of Sedum aizoon and Sedum spectabilis

The effects of soil water stress on the growth and the biomass distribution of Sedum aizoon L. and S. spectabilis Boreau were studied. The results showed that the growth and the biomass distribution of the two species were significantly affected by soil water stress. The increments of plant height, leaf number, total leaf area and biomass of the two species decreased with the increase of the intensity of water stress. Greater growth inhibition by water stress was found in Sedum aizoon than in S. spectabilis. The biomass distribution was significantly affected by soil water stress, the root/shoot ratio decreased under serious drought condition. Mo- reover, water stress decreased the water contents of the two species, and the decrease in Sedum aizoon was greater than that in S. spectabilis. The studies indicated that S. sepectabilis was better adapted to water stress than Sedum aizoon.