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首页> 外文期刊>Urban ecosystems >Comparison of water-use characteristics of landscape tree [Tabebuia argentea) and palm (Ptychosperma macarthurii) species in a tropical roof garden with implications for urban water management
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Comparison of water-use characteristics of landscape tree [Tabebuia argentea) and palm (Ptychosperma macarthurii) species in a tropical roof garden with implications for urban water management

机译：热带屋顶花园中景观树（Tabebuia argentea）和棕榈树（Ptychosperma macarthurii）物种的用水特征比较，对城市水管理具有重要意义

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In cities, landscape palms and trees are planted for scenic views and normally maintained with frequent irrigation. With similar water input, their morphological difference may lead to different water-use that varies seasonally. Thus, evaluating their water-use patterns is necessary to achieve proper urban water management. Here, we examined water-use characteristics of Tabebuia argentea and Ptychosperma macarthurii, a tree and a palm species, in a roof garden in Bangkok, Thailand. Self-constructed Granier's probes were used for sap flux measurement and monitored for five months in 2016. Results showed that palm transpired 3-4 times higher water than tree daily. With frequent watering, tree was more sensitive to increasing vapor pressure deficit (D) than palm on rain-free days. When rainfall occurred, however, both species became less sensitive to D and continued consuming more water at high D. Extending the analysis to include a hypothetical warming climate with +4.8 A degrees C temperature, we found that tree saved more water than palm on rain-free days. However, daily transpiration of both species increased similarly by 14-18% on rainy days. These results imply that Tabebuia argentea may provide ecosystem benefits by conservatively using water under drought and decelerating runoff from the garden when storms come. In contrast, Ptychosperma macarthurii may provide ecosystem disservice with high water-use in dry season but may slow down runoff in wet season and therefore benefiting downstream ecosystems. These findings are useful for selective planting associated with future changes in precipitation patterns, leading to sustainable urban water management.
机译：在城市中，种有风景优美的棕榈树和树木，并经常进行灌溉以保持景观。在输入水量相似的情况下，它们的形态差异可能导致不同的用水量，这些用水量随季节而变化。因此，评估其用水模式对于实现适当的城市用水管理是必要的。在这里，我们在泰国曼谷的一个屋顶花园中检查了Tabebuia argentea和Ptychosperma macarthurii（一种树和一种棕榈树）的用水特性。自建的Granier探针用于树液通量的测量，并在2016年进行了五个月的监测。结果显示，棕榈每天蒸腾的水量是树木的3-4倍。经常浇水，在无雨天，树木比棕榈树对增加的蒸气压亏缺（D）更敏感。但是，当出现降雨时，两个物种对D的敏感度都降低了，并在高D时继续消耗更多的水。扩展分析以包括+4.8 A摄氏度的假设气候变暖，我们发现树在雨中比棕榈省水-空闲的日子。然而，在雨天，这两个物种的日蒸腾量相似地增加了14-18％。这些结果表明，Tabebuia argentea通过在干旱条件下保守地使用水并在暴风雨来临时减少花园的径流可能为生态系统带来好处。相反，Mactyhurs macarthurii可能在干旱季节用水量高时给生态系统造成破坏，但在潮湿季节可能会减慢径流，因此有利于下游生态系统。这些发现对于与降雨模式的未来变化相关的选择性种植很有用，有助于实现可持续的城市水资源管理。

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