Stem and Leaf Anatomical Characteristics of Eight Species on Heimahe Grassland

Leaf anatomical characteristics of eight species plants on Heimahe Grassland are compared and analyzed using wax-slides.Results showed that leaf structure of all species is similar,composed of epidermis,mesophyll and leaf vein.The leaf belongs to two types: bifacial leaf and Isobilateral leaf.Their common characteristic is that palisade tissue has multilayered and well-developed.The ratio of palisade tissue and spongy tissue is high.The cell is arranged loosely with well-developed aerenchyma.Leaf vein has well-developed and separated by small space.Differences among leaf anatomical structure are the ranges of variation among thickness of leaf and mesophyll,intercellular space.The range of the thickness of spongy tissue variation is the biggest followed by intercellular spaces and the ratio of palisade and spongy.All leaf anatomical structures of eight species show distinctive characteristics for both mesophyte and xerophytes,and even hygrophyte.Results show that there may be distinctive manners of plant adaptations to various environments,but that all plants adapt to hypoxia,low temperatures,and intense radiation environments.