Water availability is a limiting factor for the establishment and development of forest species. To understand the appropriate conditions for the initial post-transplanting phase, it is necessary to understand the specific morphophysiological characteristics of the species, such as the leaf water potential and the efficiency of photosystem II. We aimed to identify the influence of different water regimes on the morphophysiological aspects of young plants of two forest species (Cedrela fissilis Vellozo and Eucalyptus saligna Sm.). Two greenhouse experiments were conducted for 28 days; one for each species. The design was completely randomized, and the treatments consisted of six different water regimes. Leaf water potential (Ψw) and chlorophyll a fluorescence were evaluated every 7 days. At the end of the experiment, morphological attributes (height, collection diameter, root volume, and dry matter) were measured and histological blades were made. The water demand of E. saligna was higher than that of C. fissilis and required greater replacement within a shorter period. The rehydration from Ψw = − 2 Mpa allowed for a fast recovery of the young C. fissilis plants (Ψw = − 1.5, Fv/Fm = 0.796), which indicated good physiological plasticity of this species when submitted to water stress at a level that is not severe. The total dry matter allocation was different among species. Seedlings of E. saligna presented the best responses when submitted to a continuous water supply regime, while C. fissilis seedlings presented the best response under intermittent irrigation conditions.

可用水是建立和发展森林物种的限制因素。为了了解初始移植后阶段的适当条件，有必要了解该物种的特定形态生理特征，例如叶水势和光系统II的效率。我们的目的是确定不同水分制度对两种森林物种（Cedrela fissilis Vellozo和Eucalyptus saligna Sm。）幼树的形态生理方面的影响。进行了两个温室实验，为期28天；每个物种一个。设计是完全随机的，并且处理包括六种不同的水处理方案。叶片水势（Ψw）和叶绿素a每7天评估一次荧光。在实验结束时，测量形态学属性（高度，收集直径，根体积和干物质）并制作组织学刀片。裂殖大肠杆菌的需水量高于裂殖酵母的需水量，需要在更短的时间内进行更多的替代。Ψw  = − 2 Mpa的水合作用可快速恢复年轻的C. fissilis植物（Ψw  = − 1.5，Fv / Fm  = 0.796），这表明该树种在水分胁迫下的生理可塑性良好。不严重。不同物种间总干物质分配不同。的幼苗E.柳桉当提交给连续供水制度，而所呈现的最佳反应C. fissilis苗呈现间歇灌溉条件下的最佳响应。