Responses of gas exchange and water-use efficiency in Platycladus orientalis and Amorpha fruticosa to drought episode and rewatering

To explore the changes in photosynthetic properties of two typical afforestation species (Platycladus orientalis and Amorpha fruticose) under drought stress and the subsequent recovery mechanism after rewatering, a pot experiment was carried out in greenhouse. The results showed that water deficit inhibited the photosynthesis of two afforestation plants. The decrease in transpiration rate (Tr) was larger than that of Pn and the water-use efficiency improved to some extent. After rewatering, the photosynthetic parameters of three growth stages of two afforestation plants gradually recovered, indicating the stimulation in compensation effects on photosynthetic characteristics of two afforestation plants after rewatering, the photosynthetic indexes in two tree species could rapidly recovered close to control after 72h of rewatering.

为探究干旱胁迫下两种典型造林树种——侧柏（Platycladus orientalis）与紫穗槐（Amorpha fruticose）的光合特性变化，以及复水后的恢复机制，本研究于温室开展盆栽试验。结果显示，水分亏缺会抑制两种造林植物的光合作用，其中蒸腾速率(Tr)的下降幅度高于净光合速率(Pn, net photosynthetic rate)，且水分利用效率得到一定程度提升。复水后，两种造林植物三个生长阶段的光合参数均逐渐恢复，表明复水可对两种造林植物的光合特性产生补偿刺激效应；供试两树种的光合指标在复水72小时后即可快速恢复至接近对照组的水平。

搜集汇总

背景与挑战

背景概述

该数据集聚焦于侧柏和紫穗槐两种造林树种，通过盆栽实验研究其在干旱胁迫和复水条件下的光合特性变化与恢复机制。研究发现，干旱抑制了光合作用，但提高了水分利用效率；复水后光合参数在72小时内可恢复至接近正常水平。数据集属于西北干旱荒漠区煤炭基地生态安全保障技术项目，以文档格式提供，适用于植物学相关研究。