论文部分内容阅读
对元谋干热河谷引种的 8种外来树种进行了抗旱性分析 ,发现水分利用效率从高到低的顺序依次是 :窿缘桉、赤桉、柠檬桉、绢毛相思、肯氏相思、厚荚相思、大叶相思、马占相思。水分利用效率越高 ,对干热环境的适应性越强。 8种外来树种适应干热河谷生境的旱性结构的特点是主根深、侧根多、栅栏组织和贮水组织发达、构成等面叶或近等面叶。桉树类树种的蒸腾速率较高 ,但能生存的主要机理是根系分布深 ,主动供水能力强 ,补充了地上部分的水分消耗 ;而相思类则以发达的根系和较高的叶片保水能力来适应干热环境
The drought resistance of eight exotic species introduced in Yuanmou dry and hot valley were studied. The results showed that the highest water use efficiency was as follows: Eucalyptus grandis, Eucalyptus grandis, Eucalyptus globulus, Acacia mangium, Kenwood acacia, Acacia, Acacia, Acacia. The higher water use efficiency, the stronger adaptability to dry and hot environment. Eight species of alien species that adapt to the drought-resistant structure of dry-hot valley habitat are characterized by deep root and lateral root, palisade tissue and water-storage tissue developed to form isosceles or near-iso-leaf. The main transpiration rate of eucalyptus species is higher, but the main mechanism of survival is deep root distribution, active water supply capacity, supplement the above ground water consumption; and Acacia is developed root system and higher leaf water retention capacity to adapt Dry and hot environment