期刊
LANDSCAPE AND URBAN PLANNING
卷 178, 期 -, 页码 122-129出版社
ELSEVIER
DOI: 10.1016/j.landurbplan.2018.06.002
关键词
Stormwater; Water sensitive urban design; Sustainable urban drainage systems; Low impact design; Urban forest management
类别
资金
- Moreland City Council
- Melbourne Water's Living Rivers program
- Australian Research Council [LP140100885]
- Melbourne Water
- City West Water
- Nursery and Gardens Industry Australia
- Australian Research Council [LP140100885] Funding Source: Australian Research Council
Cities around the world are embracing stormwater control measures (SCMs) to reduce the environmental damage caused by impervious runoff. At the same time, there is a push to increase tree canopy cover to green neighborhoods and mitigate urban heat. Establishing SCMs that include trees may achieve these two objectives, but it is important to understand which design characteristics promote or reduce tree health and growth. We therefore undertook an 18-month streetscape experiment comparing four tree pit SCM designs, along with a control (non-SCM) street tree planting, to identify design characteristics influencing the water balance and growth of newly planted trees (Acer campestre (L)) in an established urban area dominated by clay soils. Trees in pits with an underdrain showed double the growth of conventionally planted street trees receiving no storm water. However, the low exfiltration rates of some non-drained tree pits resulted in some tree pits experiencing waterlogging and subsequent poor tree growth or even death. In other non-drained tree pits, the heterogeneity of urban soils resulted in sufficiently high exfiltration rates to avoid waterlogging and promote increased tree growth, even in these heavy clay soils. Our results suggest that establishing tree growth can be substantially increased by directing stormwater into tree pits, however, waterlogging conditions should be avoided via an underdrain or limiting installation to soils with a sufficiently high exfiltration rate.
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