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摘要: |
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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19%；日平均耗水速率平均下降了50%-65%。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。
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关键词:
CO2浓度倍增;干旱胁迫;蒸腾耗水速率;蒸腾耗水量;叶面积
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DOI：
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分类号：
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基金项目：国家自然科学基金 |
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Interactive effect of doubled CO2 concentration and different drought stress on daily variation in transpiring water-consumption of tree saplings |
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Abstract: |
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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. Throughout the whole drought stress period, the average daily water consumptions of Fraxinus velutina, Syringa oblate and Buxus sinica planted in the doubled CO2 concentration reduced averagely by 33% 、41% and 45% respectively than those in the normal CO2 concentration. During the period of severe drought stress, the daily average transpiring rates of F. velutina， S. oblate，B. sinica and P. orientalis planted in the doubled CO2 concentration reduced averagely by 50%-65% 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.
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Key words:
doubled CO2 concentration; drought stress; transpiring water-consumption rate; water consumption; leaf areas
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