Although numerous examples of green roofs can be found in Turkey,limited research has been conducted on plant material and substrate type in this climate.Both plants and substrate are very important components in gree...Although numerous examples of green roofs can be found in Turkey,limited research has been conducted on plant material and substrate type in this climate.Both plants and substrate are very important components in green roof design,it is essential to determine the proper substrates and plants in green roof systems for domestic green roof design.Two types of growing substrates:a commercial substrate consisting of crushed brick and clay(45%),pumice(45%),and organic matter(10%),and a recycled substrate including 90%coarse pumice(10-20 mm)and municipal compost(10%),were tested in three depths of 4,7 and 10 cm.Tested plant species included Achillea millefolium,Armeria maritima,Sedum acre and Sedum album.Overall,the commercial substrate performed better than the recycled pumice.In addition,deeper substrates promoted greater survival and growth for nearly all species tested.Either A.maritima or A.millefolium survived in the recycled pumice at any depth,whereas they did survive when grown in the commercial substrate in greater than 7 cm and 10 cm,respectively.They both likely would require supplemental irrigation to be acceptable for green roofs in Istanbul or locations with a similar climate.Both Sedum species survived in all substrate types and depths.Information gained can be utilized by green roof professionals in the Istanbul region and in other parts of the world with a similar climate.展开更多
Introduction:Since their development in the late 1970s in Germany,extensive green roofs(EGR)have become increasingly popular as mitigation tools for urban environmental issues around the world.EGRs are planted with se...Introduction:Since their development in the late 1970s in Germany,extensive green roofs(EGR)have become increasingly popular as mitigation tools for urban environmental issues around the world.EGRs are planted with select species,which ensure consistent cover and performance over time.This research presented herein is part of a systematic re-evaluation of EGR technology since the German industry began.Methods:Given the opportunity to access a small sample of old EGRs installed over 20 years ago in south-west Germany,this research surveyed the vegetation and substrate with an interest in describing these parameters with time-through-space substitution.Results:Similar to previous studies,this preliminary work found correlations between roof age with vegetation(cover abundance and species diversity)and substrate properties(e.g.,depth,organic content,pH,and nutrients).Roof age had positive relationship with soil organic content(Corg),and negative relationships with substrate depth and soil pH.These soil variables are inter-related,as shallow acidic substrates create unfavourable conditions for decomposition and thereby the accumulation of duff.Substrate variables correlated with EGR vegetation,suggesting a trend of simplified species composition over time.Indeed,Corg had a negative relationship with cover and species diversity of most life forms;only Sedum species had positive associations with Corg.Conclusions:Considering the dynamics associated with shallow mineral substrates,and the greater floristic diversity of younger roofs,simple Sedum-based vegetation may represent a steady state for conventional EGRs.展开更多
基金Scientific Research Project Coordination Unit of Istanbul University provided funding for this study,grant no:518145661 and 10207.
文摘Although numerous examples of green roofs can be found in Turkey,limited research has been conducted on plant material and substrate type in this climate.Both plants and substrate are very important components in green roof design,it is essential to determine the proper substrates and plants in green roof systems for domestic green roof design.Two types of growing substrates:a commercial substrate consisting of crushed brick and clay(45%),pumice(45%),and organic matter(10%),and a recycled substrate including 90%coarse pumice(10-20 mm)and municipal compost(10%),were tested in three depths of 4,7 and 10 cm.Tested plant species included Achillea millefolium,Armeria maritima,Sedum acre and Sedum album.Overall,the commercial substrate performed better than the recycled pumice.In addition,deeper substrates promoted greater survival and growth for nearly all species tested.Either A.maritima or A.millefolium survived in the recycled pumice at any depth,whereas they did survive when grown in the commercial substrate in greater than 7 cm and 10 cm,respectively.They both likely would require supplemental irrigation to be acceptable for green roofs in Istanbul or locations with a similar climate.Both Sedum species survived in all substrate types and depths.Information gained can be utilized by green roof professionals in the Istanbul region and in other parts of the world with a similar climate.
文摘Introduction:Since their development in the late 1970s in Germany,extensive green roofs(EGR)have become increasingly popular as mitigation tools for urban environmental issues around the world.EGRs are planted with select species,which ensure consistent cover and performance over time.This research presented herein is part of a systematic re-evaluation of EGR technology since the German industry began.Methods:Given the opportunity to access a small sample of old EGRs installed over 20 years ago in south-west Germany,this research surveyed the vegetation and substrate with an interest in describing these parameters with time-through-space substitution.Results:Similar to previous studies,this preliminary work found correlations between roof age with vegetation(cover abundance and species diversity)and substrate properties(e.g.,depth,organic content,pH,and nutrients).Roof age had positive relationship with soil organic content(Corg),and negative relationships with substrate depth and soil pH.These soil variables are inter-related,as shallow acidic substrates create unfavourable conditions for decomposition and thereby the accumulation of duff.Substrate variables correlated with EGR vegetation,suggesting a trend of simplified species composition over time.Indeed,Corg had a negative relationship with cover and species diversity of most life forms;only Sedum species had positive associations with Corg.Conclusions:Considering the dynamics associated with shallow mineral substrates,and the greater floristic diversity of younger roofs,simple Sedum-based vegetation may represent a steady state for conventional EGRs.
