人工湿地园中泽泻沼泽植物蒸腾特性日变化的研究

试验研究了人工湿地园中泽泻沼泽植物蒸腾特性的日变化。结果表明：在晴朗的天气泽泻叶片的蒸腾速率日进程呈双峰曲线变化，出现“午休”现象，上午的峰值要高于下午。这种现象是由于受气孔阻力的影响所致。蒸腾速率日变化不受叶片温度、相对湿度、大气温度和光量子通亮密度单一因素的影响，是由泽泻自身的生理特性所决定的。

Study on Daily Variations in Transpiration Characteristics of Wetland Plants Like Alisma orientale in Constructed Wetland Garden

The artificial wetland system is an integrated ecosystem, with good interior cycles and better economic and ecological benefits. The transpiration characteristics of wetland plants like Alisma orientale in artificial wetland garden were studied. The results show that the daily variation of leaf transpiration rate from Alisma orientale takes on doublet curve and noon break phenomenon on clear days, with the peak value in the morning higher than that in the afternoon. This phenomenon is mainly caused by the stomatal resistance. It is the reflection of the innate physiological characteristics of Alisma orientale, not a result of a single factor such as leaf temperature, correlative humidity, air temperature, or photon flux density. It follows that different responses of wetland plants to the environment can provide theoretical basis for constructing biodiversity of constructed wetland garden.