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A Four Year Study Of The Effects Of Substrate Depth On The Survival Of Different Plant Species In Portland, Or, Arjun Viray
A Four Year Study Of The Effects Of Substrate Depth On The Survival Of Different Plant Species In Portland, Or, Arjun Viray
Student Research Symposium
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 …