【摘要】 在植物生长季内测定了内蒙古半干旱草原 6种主要植物的光合和水分利用特征 ,比较了植物之间在光能和水分利用方面的差异 ,认为水分利用效率难以反应植物对干旱的适应性 ,而其倒数———水分竞争系数是较好的表征指标 ;植物的光能利用效率和水分竞争系数之间存在补偿关系 ;半干旱草原主要植物适应环境的方式不同 ,它们在光能和水分资源生态位上存在分离。更多还原

【Abstract】 Characteristics of photosynthesis and water use of six main plants were experimentally studied and compared in the semiarid steppe in Inner Mongolia during growth season. It was suggested that water use efficiency (WUE) was not able to demonstrate the adaptation of different plants to arid condition. However, its reciprocal, namely water competitive coefficient, fitted well with plant adaptation. Light use efficiency and water competitive coefficientwas on trade off. Plants living in semiarid steppe had various adaptive strategies. They separated in light and water resource use niches.更多还原