干旱和CO_2浓度升高对干旱区春小麦气孔密度及分布的影响  

LEAF STOMATAL DENSITIES AND DISTRIBUTION IN TRITICUM AESTIVUM UNDER DROUGHT AND CO_2 ENRICHMENT

作　　者：杨惠敏[1] 王根轩[1] 

机构地区：[1]兰州大学干旱农业生态国家重点实验室,兰州730000

出　　处：《植物生态学报》2001年第3期312-316,共5页Chinese Journal of Plant Ecology

基　　金：国家自然科学基金! ( 3 9770 447);国家重点基础研究专项经费! ( G19990 1170 5)

摘　　要：通过对不同土壤水分状况、不同 CO2 浓度条件下春小麦叶片气孔的观测结果表明 :干旱和 CO2 浓度升高不仅影响叶片气孔密度 ,而且也影响其分布。随干旱程度的加剧 ,气孔密度有明显的上升趋势 ,气孔在叶片上的分布趋向均匀 ;随 CO2 浓度的升高 ,气孔密度有明显的下降趋势 ,其分布也趋向均匀。水分状况和 CO2 浓度相同时 。Wheat plants (Triticum aestivum L.) was grown in pots at three water levels (80%, 60% and 40% field water capacity) and three CO 2 concentrations (350, 550 and 700 parts per million by volume (μmol·mol -1 )) in open top chambers (OTC). Leaf stomata characteristics were observed and measured. Drought and CO 2 enrichment both influenced not only the leaf stomatal densities but also their distribution. Drought increased the abaxial stomatal densities while high CO 2 decreased these densities. The variations of the stomatal distributions were diminished under drought and high CO 2 treatments. Different temperatures also influenced the stomatal densities and distributions under constant water levels and CO 2 concentrations.

关 键 词：春小麦 干旱 CO2浓度升高 气孔密度 气孔分布 

分 类 号：Q948[生物学—植物学]