<正>把土壤 -植物 -大气视为一个连续体 ,通过研究喀斯特森林树种不同适应等级种组的吸水潜能、耗水能力和水分利用效率 ,初步评价各种组的耐旱适应性。结果表明 ,水分平衡方式因种组而异 ,先锋种为高输入低输出高效率类型 ,次先锋种为中输入中输出较高效率类型 ,过渡种为较低输入中输出较低效率类型 ,次顶极种和顶极种为中输入、中输出中效率类型。先锋种、次先锋种耐旱适应性强于次顶极种和顶极种。同一种组内落叶阔叶树种耐旱适应性弱于常绿阔叶树种 ,证实了“喀斯特森林中落叶成分是对干旱的适应”的论断

Considering soil plant atmosphere as a continuum,sopping potential,ability of consume water and efficiency of water using for different species were studied,and the tolerate drought adaptability of species groups of adaptation grade in Karst forest was evaluated.The results showed that there were different water balance ways for different species groups.Pioneer species with high input and low output belong to high efficiency type;Sub pioneer species with middle input and output belong to higher efficiency type;Transition species with lower input and middle output belong to lower efficiency type;Sub climax and climax with middle input and output belong to efficiency.The adaptability of tolerate drought for pioneer and sub pioneer species were higher than of sub climax and climax species.The adaptability of tolerate drought of deciduous broad leaved trees was lower than of evergreen broad leaved tree.The judgment that deciduous broad leaved tree in Karst forest adapted in dry habitat was proofed.