二氧化碳倍增对春兰叶片结构的影响

Leaf structure of Cymbidium goeringii with CO_2 concentration doubling

全球大气二氧化碳(CO2)体积分数持续上升,不仅对全球气候的变迁产生重大影响,而且对植物的叶片形态结构也产生了不同程度的影响。为考察春兰Cymbidium goeringii叶片形态结构对二氧化碳体积分数倍增的响应,在人工气候箱中分别以二氧化碳体积分数370±50μL·L-1和700±50μL·L-1对盆栽春兰处理2个月。结果发现,除叶长度与叶厚度没有显著变化外,春兰叶片在二氧化碳体积分数倍增条件下其叶面积、叶绿体质量分数有显著增加,但表皮细胞密度、气孔密度、气孔指数以及气孔开度却呈下降趋势,而且差异显著。

An increase in atmospheric CO2 concentration since the industrial revolution has influenced not only global climate change but also leaf morphology and structure of plants. The effects of CO2 doubling on leaf morphology and structure of the Cymbidium goeringii leaf were investigated with CO2 concentrations of 370 and 700 （± 50） μL·L-1 in an artificial climate chamber for two months. Results indicated no differences （P0.05） for leaf length and leaf thickness. However, by doubling CO2 concentration, leaf area and chloroplast content increased significantly （P0.01）, whereas epidermal cell density（P0.05）, stomatal density （P0.01）, stomatal index （P0.01）, and stomatal aperture decreased.