Start Date

10-5-2017 11:00 AM

End Date

10-5-2017 1:00 PM

Subjects

Green roofs (Gardening) -- Oregon -- Portland -- Case studies, Urban runoff -- Management -- Oregon -- Portland, Invasive plants -- Effect on green roofs

Description

The changes in green roof plant species composition was observed after a four year time period. Twelve plots were planted in either native or non-native species at two different substrate depths according to a 2 by 2 factorial design. The list of original species from installation was used to identify which species survived over time in their respective plots. After four years, 9 out of 12 native species and 13 out of 14 species survived. The high survival of 26 original species must be compared to the colonization of 68 new species. With minimal maintenance, new species colonized plots. Extensive plots were composed of 33% original planting and 67% colonizing species. Intensive plots were composed of 24% original plantings and 76% new species. The original species that had the highest survival were Sedums and Festuca.

Authors: Arjun Vijay, Olyssa Starry

Presenter: Arjun Viray

Persistent Identifier

http://archives.pdx.edu/ds/psu/20027

Share

COinS
 
May 10th, 11:00 AM May 10th, 1:00 PM

A Four Year Study of the Effects of Substrate Depth on the Survival of Different Plant Species in Portland, OR

The changes in green roof plant species composition was observed after a four year time period. Twelve plots were planted in either native or non-native species at two different substrate depths according to a 2 by 2 factorial design. The list of original species from installation was used to identify which species survived over time in their respective plots. After four years, 9 out of 12 native species and 13 out of 14 species survived. The high survival of 26 original species must be compared to the colonization of 68 new species. With minimal maintenance, new species colonized plots. Extensive plots were composed of 33% original planting and 67% colonizing species. Intensive plots were composed of 24% original plantings and 76% new species. The original species that had the highest survival were Sedums and Festuca.

Authors: Arjun Vijay, Olyssa Starry

Presenter: Arjun Viray