中文摘要：

[目的]揭示多花木兰对土壤干旱胁迫的响应。[方法]采用盆栽控水法模拟干旱条件，测定多花木兰光合、生理指标。[结果]多花木兰的净光合速率在轻度干旱胁迫下变化不明显.而在中度和重度干旱胁迫下显著降低：干旱胁迫使气孔导度、蒸腾速率、胞间CO2浓度整体呈现下降趋势，在重度干旱胁迫下净光合速率、气孔导度、蒸腾速率、胞间CO2浓度分别较对照组下降了61．04％、86．27％、87．77％和42．63％;多花木兰叶片丙二醛含量在轻度干旱胁迫下增加不显著,在中度和重度干旱胁迫下显著增加，重度干旱胁迫下丙二醛含量是对照组的1．63倍：多花木兰脯氨酸和可溶性糖含量随干旱胁迫的加剧均呈显著增加趋势,在重度干旱胁迫下其脯氨酸和可溶性糖含量分别是对照组的8．06倍和3．16倍。[结论]多花木兰耐旱性较强,适宜于偏干旱环境生长,可作为水电边坡植被修复物种。

英文摘要：

[Objective] This study aimed to reveal responses of Magnolia multiflora to soil drought stress. [Method] Pot experiment was employed to simulate drought stress, and photosynthetic and physiological indices of M. multiflora were determined. [Result] The net photosynthetic rate （Pn） of M. multiflora did not change significantly under mild drought stress, and reduced significantly under moderate and severe drought stress. Drought stress reduced stomatal conductance （Gs）, transpiration rate （Tr） and intercellular CO2 concentration （Ci）, and compared with those in the control group, the Pn, Gs, Tr and Ci under severe drought stress declined by 61.04%, 86.27%, 87.77% and 42.63%, respectively. The malondialdehyde （MDA） content in M. multiflora leaves did not increase significantly under mild drought stress, and increased significantly under moderate and severe drought stress. The MDA content in M. multiflora leaves under severe drought stress was 1.63 times as high as that in the control group. The proline （Pro） and soluble sugar contents of M. multiflora increased significantly with the aggravation of drought stress, and those under severe drought stress were 8.06 times and 3.16 times respectively higher than those in the control group. [Conclusion] M. multiflora has a strong drought tolerance, and is suitable for growing in relatively arid environment. It can be used as candidate for vegetation restoration in hydropower engineering slope.