差不嘎蒿茎叶解剖特征及其与气候因子的关系

差不嘎蒿(Artemisia halodendron)是我国东北部重要的防风固沙植物,本研究利用石蜡切片法观察内蒙古不同地区差不嘎蒿的叶片和茎解剖结构,运用方差分析方法比较不同地区差不嘎蒿解剖结构间的差异性,以逐步回归得出影响解剖数量特征的主导气候因子.结果表明:差不嘎蒿叶为等面叶,表皮细胞为1层,栅栏组织呈环栅型,排...

Leaf and Stem Anatomical Structures of Artemisia halodendron and Their Relationship to Climatic Factors

Artemisia halodendron is an important wind-breaking and sand-fixing plant in northeast China. In our study,the anatomical structures of the leaves and stems of A.halodendron were observed by the paraffin section technique in different regions of Inner Mongolia. Based on the measurements,using ANOVA to compare the differences among different regions,the dominant climatic factors affecting anatomical quantitative characteristics were obtained by stepwise regression. The results showed that:1) Anatomical structures characteristics of A.halodendron are as follows:isolateral leaf;one layer epidermal cells;ring-shaped palisade tissue,arranged closely;developed vascular bundle, One layer stem epidermal cells;outer tough infinite vascular bundle,annular arrangement;developed pith. 2)The thickness of upper epidermal cuticle and stem cortex of A.halodendron from the northern Hulunbeier sandy land was significantly higher than that from the Horqin sandy land and the diameter of pith and stem cortical had similar trends. 3)The thickness of palisade tissue and the diameter of stem sieve tube increased with the decrease of precipitation in growing season,and the upper epidermal cuticle,pith diameter and stem vessel diameter increased with the decrease of effective temperature,showing the adaptability to water and temperature. The results provided basic data for the ecological adaptability research of A.halodendron population under different climatic conditions.