库布齐沙漠几种沙生灌木叶解剖结构耐旱特征研究

采用石蜡切片法,对库布齐沙漠的主要造林灌木四翅滨藜、小叶锦鸡儿、杨柴、柽柳、互叶醉鱼草和蒙古莸等叶的解剖结构进行了显微观察。选择叶片厚度、角质层厚度、栅栏组织厚度、栅栏组织细胞长、栅栏组织细胞宽、栅栏细胞密度、CTR等多指标。结果表明,柽柳叶片厚度高于其他5种,互叶醉鱼草叶片厚度最小。互叶醉鱼草角质层厚度最厚,角质层与叶片厚度的比值大小顺序为:互叶醉鱼草四翅滨藜柽柳小叶锦鸡儿蒙古莸杨柴。CTR大小顺序为:蒙古莸杨柴小叶锦鸡儿互叶醉鱼草四翅滨藜柽柳。利用隶属函数综合评价,结果表明:6种树种耐旱能力大小依次为杨柴四翅宾藜柽柳蒙古莸小叶锦鸡儿互叶醉鱼草。

Evaluation of Drought Resistance Capacity of Desert Shrubs in Hobq Desert based on Characteristics of Leaf Anatomical Structure

The leaf thickness, cuticle thickness, palisade tissue thickness, palisade tissue cell length, palisade tissue cell wide, palisade tissue cell density and tissue structure tense ratio(CTR ) of six desert shrubs (Atripldex canescens, Caragana microphylla, Hedysarum leave, Tamarix chinensis, Buddleja alternifolia and Caryopteris mongolica) in Hobq Desert are observed under microscopy. Comparison of the characteristics of leaf anatomical structure shows that the leaf thickness of Tamarix chinensis is greater than that of the other 5 species, and leaf thickness of Buddleja alternifolia is the smallest; the cuticle thickness of Buddleja alternifolia is the biggest; the sequence of the ratio of cuticle thickness to leaf thickness is Buddleja alternifolia>Atripldex canescens>Tamarix chinensis>Caragana microphylla>Caryopteris mongolica>Hedysarum leave; the sequence of CTR is Caryopteris mongolica>Hedysarum laeve>Caragana microphylla>Buddleja alternifolia>Atripldex canescens>Tamarix chinensis. The comprehensive evaluation result of drought resistance capacity of these six desert shrubs is Hedysarum laeve>Atripldex canescens>Tamarix chinensis>Caryopteris mongolica>Caragana microphylla>Buddleja alternifolia based the calculation of Membership Function.