土壤水分对长柄扁桃生长特性及蒸散发的影响

以1年生长柄扁桃幼苗为材料,通过盆栽控水试验的方法,设置土壤含水量分别为田间持水量的50%~75%（轻度干旱胁迫）、75%~100%（对照）和100%~125%（水涝胁迫）,研究不同土壤水分胁迫对长柄扁桃幼苗生长特性及蒸散耗水规律的影响。结果表明,水分胁迫对长柄扁桃幼苗生长及蒸散耗水具有明显影响,长柄扁桃蒸散耗水量随水分胁迫程度的加剧呈下降趋势。轻度水分胁迫有利于长柄扁桃株高、基径、叶面积及新枝数的生长,但叶片衰老较快。水涝胁迫在一定程度上有利于长柄扁桃叶面积及基径的生长并能减缓叶片衰老,但不利于株高及新枝数的增加。综合分析认为,轻度水分胁迫是长柄扁桃幼苗生长的适宜土壤水分含量。

Effects of Soil Moisture on the Growth and Evapotranspiration of Amygdalus pedunculata

Using Amygdalus pedunculata 1-year-old seedlings, we studied the growth and evapotranspiration characteristics of A. pedunculata under water stress with three soil water content levels: CK (optimal soil water content, 75%-100% of the field capacity), mild drought stress (50%-75% of the field capacity) and waterlogging stress (100%-125% of the field capacity). The results showed that evapotranspiration decreased with the increase of drought stress and drought stress had a significant effect on the growth and evapotranspiration of A. pedunculata. The plant height, branch diameter, leaf area and number of new branches of A. pedunculata increased under mild drought stress, but the leaf senescence was also fast. Waterlogging stress was conducive to the growth of leaf area and branch diameter and could slow down the leaf senescence, but it was not good for the increase of plant height and number of new branches. The comprehensive analysis showed that mild drought stress was the most suitable soil moisture content for the growth of A. pedunculata seedlings.