杨品种‘普瑞’和‘107’对模拟酸雨胁迫的生理响应

通过测定杨(Populus×euramericana)抗硫新品种‘普瑞’和‘107’在3种梯度酸雨胁迫下的各项生理指标,研究酸雨胁迫对2个杨品种影响的差异。结果显示,在酸雨胁迫下,‘普瑞’叶片受伤害程度明显轻于‘107’,可以维持较稳定的光合作用,显示出较强的抗酸雨胁迫能力。酸雨胁迫下,‘107’光合作用强度显著下降,非气孔因素是其下降的主要原因。酸雨在一定程度上破坏了2个杨品种的水分平衡,尤其对‘107’的影响程度更为明显,但气孔关闭不是引起其光合作用强度下降的主要原因。研究结果表明杨品种‘普瑞’在酸雨环境下具有更强耐受性。

Differences in physiological characteristics of Populus×euramericana varieties ‘Purui’ and ‘107’ under simulated acid rain stresses

We analyzed changes in the physiological indexes of Populus×euramericana varieties ‘Purui’ and ‘107’ under different degrees of acid rain stresses. The experiment established three different acid rain gradients (CK, moderate stresses, severe stresses). Under severe stresses, the leaf surface of ‘Purui’ showed sporadic dry spots, whereas ‘107’ already showed symptoms under moderate stresses. Under an acid environment, ‘Purui’ exhibited a certain resistance to acid rain and maintained normal growth and photosynthetic capacity after moderate and severe stresses. However, for ‘107’, acid rain caused a significant decrease in photosynthesis, with non-stomatal factors found to be the main reason leading to its decline. Furthermore, acid rain impacted the water balance, especially for ‘107’, but stomatal closure was not the main reason for the decline in photosynthesis intensity. Thus, ‘Purui’ expressed significantly stronger resistance to acid rain than ‘107’.