【摘要】 采用BP3400精密电子天平和Licor-7000开路式CO2/H2O分析仪,于2007年夏季研究了不同CO2浓度梯度和不同干旱胁迫水平下,4树种幼树的实际耗水量及蒸腾耗水速率的日变化规律。结果表明,在各干旱胁迫水平下,CO2浓度倍增有效地降低了幼树的蒸腾耗水量和耗水速率。在干旱胁迫后期,白蜡、丁香、黄杨、侧柏的日平均耗水量分别比对照下降了42%、52%、37%和20%;日平均耗水速率平均下降了51%~66%。经过CO2倍增处理后,4种幼树的叶面积都明显增加,并且连续处理时间越长,效果越明显。更多还原

【Abstract】 Daily variation of water consumption and transpiring rates of saplings of 4 tree species planted in different CO2 concentrations and drought stress were studied by BP3400 Precision Electronic Balance and Licor-7000 Open Analysis in the summer of 2007.The results showed that the interaction of doubled CO2 concentrations with drought stress reduced the water consumption and transpiring rates of the saplings effectively.In the late of drought stress period,the average daily water consumptions of Fraxinus velutina,Syringa oblata,Buxus sinica and Platycladus orientalis planted in the doubled CO2 concentration reduced by 42%、52%、37% and 20% respectively than those in the normal CO2 concentration.During the period of severe drought stress,the daily average transpiring rates of F.velutina,S.oblata,B.sinica and P.orientalis planted in the doubled CO2 concentration reduced averagely by 51%～66% respectively.The leaf areas of saplings in the doubled CO2 concentration were higher than those in the normal.And the longer the saplings grown in the doubled CO2 concentration,the more leaf areas of the saplings increased.更多还原