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城市环境中街头树木的水源
Ian A Smith1, Pamela H Templer2, Lucy R Hutyra1
1Boston University, Department of Earth & Environment, 685 Commonwealth Ave., Boston, MA 02215, USA.
The Science of the total environment
|November 8, 2023
概括
墨西哥城市的街头树木主要利用降雨而不是灌来获取水. 这种对降雨的依赖可能会随着气候变化加剧而增加它们对干旱的脆弱性.
科学领域:
- 环境科学 环境科学
- 城市生态城市生态学
- 植物生理学 植物生理学
背景情况:
- 街头树木对于城市气候适应性至关重要,提供诸如城市减热和雨水流量减弱等好处.
- 了解城市树木在城市环境中的水源对于有效的城市林业和气候适应战略至关重要.
- 之前的研究重点是干旱地区的水吸收,对城市树木水源的知识缺口.
研究的目的:
- 为了确定Acer platanoides在马萨诸塞州波士顿街头树木所使用的水的比例来源.
- 为了研究降雨事件对街道树木吸收水的影响,在一个城市生态系统中.
- 评估已识别的水源在不断变化的气候条件下对城市树木健康和雨水管理的影响.
主要方法:
- 利用天然丰富的稳定同位素的和氧来追踪水源.
- 采用贝叶斯的多源混合模型来量化来自降水,灌,地下水和废水的水贡献.
- 分析了树干样本中的同位素比例,并将它们与潜在的水源进行了比较.
主要成果:
- 街头树木主要利用降雨量,占8月份的72.3%和9月份的65.6%,在高降雨的夏季.
- 使用的降雨量很大一部分可以追溯到主要的风暴事件,7月降雨量贡献高达84.0%.
- 在树冠覆盖和降雨驱动的蒸发转化之间发现了强烈的相关性,支持城市树木在雨水缓解中的作用.
结论:
- 墨西哥城市的城市街头树主要依赖降雨来满足它们的水需求.
- 目前的供水战略强调了城市植被的雨水缓解潜力.
- 由于气候变化的干旱频率增加,对这些城市树木的水安全和健康构成重大风险.
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