Abstract
Sedum sarmentosum and Sedum lineare, two common plants for green roof, were planted in two engineered media meeting FLL standards at three depths. Root characteristics of root length density, root surface area density, and root volume density were quantified. And a key hydraulic property, saturated hydraulic conductivity (Ks) values of the engineered media with and without plants were measured. The results showed that engineered media type, engineered media depth, and their interaction all have a significant impact on Sedum root traits. For the engineered media with Sedum, only engineered media type and depth had a significant effect on Ks. When the type of engineered media was the same, with the same plant used, Ks of the engineered media at a depth of 14 cm was significantly smaller than Ks of any other depth. This can be attributed to the maximum level of RSD and RVD at the 14-cm depth. The reduction in Ks of the perlite-based engineered media due to plant roots is an important finding, as plant roots clog the pore spaces and lead to poor drainage and unexpected ponding in roofs. This research provides better understanding of the interaction between plant roots and engineered media in green roofs.
Highlights
Green roofs, as an important measure of source control and runoff control in sponge cities, have received widespread attention in recent years [1]
For the RLD of Sedum sarmentosum, engineered media type (F=259.97, P
The results of Lu et al [8], who studied the impacts of media depth on the morphology of Sedum lineare in a green roof system, showed that the growth of root length in a shallow media of 4 cm was greater than the growth in a 10 cm media
Summary
As an important measure of source control and runoff control in sponge cities, have received widespread attention in recent years [1]. In modern green roof structures, plants and engineered media are two important functional layers. Plants ensure the ecological benefits of green roofs [2] and engineered media is the main site for water/solute movement. There is a close interaction between plants and engineered media.For example, plant roots can change the physical structure and hydraulic properties of engineered media, which in turn can affect the water movement within green roofs [3]. The purposes of this study were to quantify the effects of engineered media type and depth on Sedum root traits and to compare Ks values of engineered media varying in type and depth with different root traits
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
