Key message

The high-quality sap flow dataset of Melaleuca styphelioides could assists local councils in assessing tree water use and aids in the development of an urban tree sustainable planting management plan

Trees have a vital part to play in urban ecosystems, offering ecological, economic, and social advantages in addition to beautifying our suburbs. Knowledge of tree water use in urban environments is crucial for facilitating urban greening when there is a perception that growing trees on the street verge on expansive soils poses a risk to pavement and buildings. Information on long-term water use by individual trees in an urban environment is essential for local councils in developing urban tree management plans for sustainable planning of trees; however, this information is scarce. Micrometeorological models have commonly been used to estimate the canopy transpiration of plants in the absence of sap flow data. However, the reliability and accuracy of these models have rarely been assessed using sap flow measurements at the field site. This study aimed to provide the water use data of four individual Australian native Melaleuca styphelioides Sm. using sap flow instruments over 25 months. Tree transpiration, estimated based on three commonly used micrometeorological models using weather parameters and tree characteristics, was assessed and compared with sap flow measurements by employing the linear regression statistical analysis. The results revealed that the modified Penman–Monteith (PM) model demonstrated the highest level of accuracy among the evaluated models, consistently yielding lower errors and providing more reliable estimates of tree water use. This suggests that this model may be more appropriate for predicting plant water use in situations where sap flow data are unavailable.

中文翻译：

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澳大利亚本土白千层在城市环境中的用水模式以及三种不同微气象模型蒸腾预测的比较

关键信息

高质量的白千层树液流数据集可以帮助地方议会评估树木用水情况，并有助于制定城市树木可持续种植管理计划

树木在城市生态系统中发挥着至关重要的作用，除了美化我们的郊区之外，还提供生态、经济和社会优势。当人们认为在街道边缘的膨胀土壤上种植树木会对人行道和建筑物构成风险时，了解城市环境中树木水的利用对于促进城市绿化至关重要。关于城市环境中个体树木长期用水的信息对于地方议会制定城市树木管理计划以实现树木的可持续规划至关重要；然而，这些信息很少。微气象模型通常用于在缺乏液流数据的情况下估计植物的冠层蒸腾作用。然而，这些模型的可靠性和准确性很少在现场使用液流测量进行评估。本研究旨在提供四种澳大利亚本土白千层Sm.的用水数据。使用液流仪器超过 25 个月。利用天气参数和树木特征，根据三种常用的微气象模型估算树木蒸腾量，并采用线性回归统计分析，对树木蒸腾量进行评估并与树液流量测量值进行比较。结果显示，修改后的 Penman-Monteith (PM) 模型在评估的模型中表现出最高的准确度，始终产生较低的误差，并提供更可靠的树木用水估计。这表明该模型可能更适合在无法获得液流数据的情况下预测植物用水量。