辽东栎叶片气孔特征参数的时空变异

利用数码图像显微镜处理系统 ,对 2 0世纪 30年代至 80年代不同植被区域内辽东栎叶片气孔特征参数进行了较为系统的观测 ,明确了辽东栎叶片气孔特征参数的变化范围 ,并对其时空变异规律进行研究 .结果表明 ,从时间分布角度 ,由 30年代至 80年代 ,暖温带落叶阔叶林区域中气孔长度、面积变化呈上升趋势 ,而气孔宽度、密度呈下降趋势 ;亚热带常绿阔叶林区域中 4个气孔特征参数均逐年递增 ;青藏高原高寒植被区域中除气孔长度下降外 ,其它 3个气孔特征参数均逐年递增 .从空间分布角度 ,在由北部至南部再到西南部分布的暖温带落叶阔叶林、亚热带常绿阔叶林至青藏高原高寒植被区域 ,30年代中 ,气孔长度、面积呈上升趋势 ,而气孔宽度、密度呈下降趋势 ;5 0年代中 ,不同植被类型区之间 ,除气孔密度差异较大外 ,其它 3个气孔特征参数差异均不明显 .图 1表 1参 9

TEMPO-SPATIAL VARIATIONS IN STOMATAL CHARACTERISTIC PARAMETERS OF QUERCUS LIAOTUNGENSIS LEAVES

Making use of the Motic Digital Imaging microscope, the stomatal characteristic parameters were observed, and the tempo-spatial variations in stomatal characteristics of Quercus liaotungensis leaves and their variety ranges in different vegetation regions from 1930's to 1980's were studied. The results showed that in time distribution, from 1930's to 1980's, stomatal length and area of Q. liaotungensis in warm temperate deciduous broadleaved forest all ascended, but stomatal width and density all descended. Four parameters of stomatal characteristics in subtropical evergreen broadleaved forest all increased year by year. Except stomatal length, the three stomatal parameters all increased year by year alpine-cold vegetation zone by year on the Tibetan Plateau. In space distribution, in 1930's, stomatal length and area of Q. liaotungensis all ascended, but stomatal width and density all descended in warm temperate deciduous broadleaved forest, subtropical evergreen broadleaved forest and the Tibetan Plateau alpine-cold vegetation region from the north to the south and the southwest in space. In the 1950's, except stomatal density, the differences in other three parameters of stomatal characteristics were not significant in different vegetation regions. Fig 1, Tab 1, Ref 9