干旱胁迫与彩色树生长状况关系研究

Relationships of drought stress and growth of three colorful trees

以金叶榆、金枝梾木和俄罗斯红叶李3种彩色树2a生苗木为试材,测定了不同程度干旱胁迫下净光合速率、蒸腾速率、细胞膜透性、叶片含水量以及高生长等指标,分析了3种彩色树的抗旱性。结果表明:在轻度干旱胁迫条件下,金叶榆和金枝梾木受到的影响小于俄罗斯红叶李;重度干旱条件下,金叶榆表现出较强的抗旱性,而金枝梾木和俄罗斯红叶李受到的影响较大。3种彩色树的抗旱性强弱排序为:金叶榆>金枝梾木>俄罗斯红叶李。

A compmative study of the drought-resistance of three colorful trees such as Ubruns pumila cv.finye, Comus stolonifera vat. glariamea and Prunus cerasifera, was carried out, according to the main physiological indexes of two-year-old seedings on different levels of drought stress, including the photosynthetic rate, transpiration rate, membrane permeability, relative water content, high-growth and so on, the drought resistance of three colorful trees was analyzed. The results showed as follows： at mild drought stress conditions, the impact on Ulmus pumila cv.jinye and Comus stolonifera vat. glariamea was less than on Pmnus cerasifera; at severe drought stress conditions, U/nuts pum//a cv. jinye showed stronger drought resistance, yet Comus stolonifera vat. glaviamea and Pruws cerasifera showed larger affected. The sequence of the three colorful trees＇ drought-resistance was in an order of Ulmus pumila cv.jinye 〉 Corrus stolordfera varglariamea〉 Prunus cerasfera.