侧柏等4树种在不同水分亏缺下恢复吸水能力的研究

以生长在呼和浩特地区的侧柏、杜松、沙棘、新疆杨为对象，研究其小枝在不同水分亏缺状态下恢复吸水能力，结果表明：（1）小枝重饱和初始水分亏缺（WSD）程度越大，重饱和相对饱和含水量（RSRWC）越小，失水后水分恢复能力也越低，树木组织受到的伤害越严重。（2）当树木失水达到初始失膨点饱和亏缺（SWDP^π）时，重饱和相对饱和含水量（RSRWC）接近于1，说明树木能恢复其所亏缺的水分，树木未受到脱水的伤害，能保持其原有吸水能力。

STUDY ON THE WATER ABSORBING ABILITY OF Platycladus orientalis ETC. UNDER THE DIFFERENT WATER DEFICIT

The characteristics of the resaturated absorbing water of Platycladus orientalis, Juniperus rigida, Hippophae rhamnoides, Populus adenopodaWTBZ] under the different deficit in Huhhot were studied. The results showed: (1) As the resaturated initial water deficit increased, the resaturated relative water content (RSRWC) of twigs and the water absorbing ability declined, and the structures of trees were damaged more seriously. (2) When the resaturated initial water deficit was equal to the water deficit at the initial loss point of the turgor, RSRWC was about 1. It showed that the trees resumed lost water, and the trees were not damaged. The trees maintained the capability of absorbing water.