Sala Florin, Herbei Mihai Valentin, Rujescu Ciprian
Department-Soil Sciences, Compartment of Soil Science and Plant Nutrition, Banat University of Agricultural Sciences and Veterinary Medicine "King Michael I of Romania", 300645 Timisoara, Romania.
Department-Sustainable Development and Environmental Engineering, Compartment Remote Sensing and GIS, Banat University of Agricultural Sciences and Veterinary Medicine "King Michael I of Romania", 300645 Timisoara, Romania.
Plants (Basel). 2021 Nov 25;10(12):2576. doi: 10.3390/plants10122576.
Water loss by evaporation is a normal physiological process, in order to regulate plant temperature. Under conditions of thermal and water stress, water loss is accelerated compared to normal conditions, and the response of plants is variable. In extreme cases, it can lead to wilting and death of plants. It was found that the phenomenon of water loss behaved as a pattern in different plant species, given by two functions, logistics (first part of water loss) and hyperbola (second part of water loss) in relation to a moment m, at which the rate of water loss (RWL) has reached its maximum value.
We studied the water loss process for a series of plant samples on different plant species ( L., H. Karst; L.; L.; L.; L.; L.), measuring the rate of weight loss (RWL) in controlled conditions. The drying of the samples was done in identical conditions (thermo-balance, 100 °C, standard temperature for drying the plant samples) with the real-time recording of the drying time simultaneously with the water loss rate (RWL) from the plant samples. The exposure time varied, depending on each species sample, and was approximately 1000 s.
The experimental data was recorded at intervals of every 10 s, during the entire drying period. RWL values varied from 0.024 to 0.054 g/min at the beginning of the drying process and reached maximum values after 70-100 s, having values between 0.258 g/min and 0.498 g/min. During the drying period, this indicator presented different graphic evolutions, difficult to be described with a single function. The first segment was described by a logistic function, and the second was described by a hyperbola, resulting in a model (RWLMod) which described the real phenomenon. This model and theoretical calculation were used to quantify the water loss in a time interval and, compared with empirical dates, no significant differences were observed, which indicated an increased degree of accuracy regarding the use of this model. Recommendation and novelty of work: The novelty of the work is given by the obtained model (RWLMod), which makes possible the description of RWL over the entire time interval, and ensures a good fit with the real data. It recommends the method and model in studies of plant behaviour under stress in relation to different influencing factors.
通过蒸发失水是调节植物体温的正常生理过程。在热胁迫和水分胁迫条件下，与正常情况相比，水分流失加速，植物的反应各不相同。在极端情况下，它会导致植物枯萎和死亡。研究发现，不同植物物种的失水现象呈现出一种模式，由与失水速率（RWL）达到最大值的时刻m相关的两个函数给出，即逻辑函数（失水的第一部分）和双曲线函数（失水的第二部分）。
我们研究了一系列不同植物物种（L.、H. Karst；L.；L.；L.；L.；L.）植物样本的失水过程，在可控条件下测量重量损失率（RWL）。样本在相同条件下（热天平，100°C，植物样本干燥的标准温度）干燥，同时实时记录干燥时间以及植物样本的失水率（RWL）。暴露时间因每个物种样本而异，约为1000秒。
在整个干燥期间，实验数据每隔10秒记录一次。干燥过程开始时，RWL值在0.024至0.054克/分钟之间变化，70 - 100秒后达到最大值，介于0.258克/分钟和0.498克/分钟之间。在干燥期间，该指标呈现出不同的图形演变，难以用单一函数描述。第一部分由逻辑函数描述，第二部分由双曲线函数描述，从而得到一个描述实际现象的模型（RWLMod）。该模型和理论计算用于量化一个时间间隔内的失水量，与实验数据相比，未观察到显著差异，这表明该模型使用的准确性有所提高。工作的建议和新颖性：工作的新颖性在于所获得的模型（RWLMod），它能够描述整个时间间隔内的RWL，并确保与实际数据良好拟合。它在研究植物在与不同影响因素相关的胁迫下的行为时推荐了该方法和模型。
