弄拉典型峰丛岩溶区青冈栎叶片形态特征及对环境的适应

选取广西弄拉典型峰丛洼地生态系统中不同地貌类型的青冈栎 (Cyclobalanopsisglauca)叶片进行形态解剖特征比较分析 ,结果表明 :( 1 )峰丛洼地生态系统中不同地貌青冈栎叶片形态解剖特征差异显著。山顶青冈栎叶片部分表皮结构 (角质膜、表皮毛、表皮细胞、气孔 )趋向旱化。山顶青冈栎下表皮毛比山腰青冈栎的浓密且长。两者叶片的厚度和宽度、上表皮细胞个数、气孔指数、下表皮厚度、栅栏组织厚度、海绵组织厚度存在着显著性差异 ;位于山顶的青冈栎受到水分的胁迫 ,在形态解剖上呈现出中生偏旱的结构。 ( 2 )青冈栎的各种形态解剖指标说明在岩溶区青冈栎的抗旱性主要是通过抵御干旱来适应水分的胁迫 ,并主要取决于减少蒸腾失水和维持水分吸收能力两个方面

Characteristics comparison of the leaf anatomy of Cyclobalanopsis glauca and its adaption to the environment of typical karst peak cluster areas in Nongla

The anatomical characters of Cyclobalanopsis glauca of different physiognomy in peak cluster areas depression ecological system in Guangxi Nongla were analyzed. The results are as follows:(1)The leaf anatomical characteristics of C.glauca are obivously different in peak cluster areas depression ecological system. Some of structures such as cuticle,trichomes,epidermis cell,stomata will express the trend of xerophilization. C.glauca trichomes on the the mountain top is denser and longer than that in the mountain side. Some characters such as lamina thickness and width,the number of upper epidermis cell,stomata index,the lower epidermis thickness,palisade tissue thickness and sponge tissue thickness,are more variational. C.glauca leaves on the mountain top have some adaptation to the water stress,such as the columniation shape of palisade cell,the closer arrange of sponge cell and hyperdomis and so on. (2)All indexes of anatomical characters indicate that C.glauca can adapt to the water stress by the drought resistance in karst ecological system.