黄土高原半干旱区臭椿气孔导度及影响因子的研究  

Stomatal Conductance and Influence Factors of Ailanthus altissima in the Less Plateau

作　　者：梁月[1] 郭建斌[1] 殷丽强[1] 

机构地区：[1]北京林业大学水土保持学院水土保持与荒漠化防治教育部重点实验室,北京100083

出　　处：《四川林勘设计》2007年第3期9-12,共4页Sichuan Forestry Exploration and Design

基　　金：国家自然科学基金项目(3007063);国家攻关资助项目(2001BA510B0304)

摘　　要：文章对黄土高原半干旱区臭椿适应干旱环境的气孔运动进行了研究。结果表明:(1)臭椿气孔导度日均值为0.11 mol.m-1.s-2,呈双峰变化曲线。(2)光合有效辐射、CO2浓度和叶水势对气孔导度有相应的影响,但相对湿度对气孔导度的影响不是很明显。(3)臭椿能适应干旱环境是由于叶水势降低导致气孔导度的减少,从而通过减少蒸腾耗水来达到适应干旱的目的。(4)臭椿通过改变气孔导度的大小影响气孔限制值,继而调节植物体内的水分平衡。以此了解臭椿的抗旱机理,为选育节水抗旱品种,提高臭椿水分利用效率提供了科学依据。In this article,the stomatal movement of Ailanthus altissima adapting habitat of semiarid region in the less plateau were studied.The following results are obtained:(1)Daily average of stomatal conductance of Ailanthus altissima is 0.11 mol·m-1·s-2,daily curves assume double-peak type.(2)The photosynthetacally active radiation,CO2 concentration and leaf water potential will have corresponding impact with stomatal conductance.However,the relationship between relative humidity and stomatal conductance is not obvious.(3) The reasonAilanthus altissima can adapt to the arid environment is that reducing of leaf water potential caused the decline of stomatal conductance,the result will reduce water consumption to achieve the goal of drought adaptation.(4) Ailanthus altissima can change the stomatal conductance to adjust the stomatal limited value and regulate the water balance of plant.These provided scientific basis for understanding drought resistant mechanism of Ailanthus altissima,breeding variety of drought resistance,and improving water utilization efficiency.

关 键 词：臭椿 气孔导度 影响因子 

分 类 号：S7[农业科学—林学]