Effect of Watering Regimen on Chlorophyll Fluorescence and Growth of Selected Green Roof Plant Taxa

By Angela K. Durhman, D. Rowe, C. L. Rugh. 2006

119 citations recorded by the source corpus.

Green roofs, or vegetative or living roofs, are an emerging technology in the United States. Because environmental conditions are often more extreme on rooftops, many xerophytic plants, especially Sedum, are ideal for extensive green roofs because they are physiologically and morphologically adapted to withstand drought. A green- house experiment was conducted to determine the effect of watering regimens on plant stress as measured by chlorophyll fluorescence (Fv/Fm), biomass accumulation, substrate moisture, and evapotransipiration on succulent plants of Sedum acre L., S. reflexum L., S. kamtschaticum ellacombianum Fisch., and non-Crassulacean acid metabolism (CAM) plants of Schizachyrium scoparium Nash and Coreopsis lanceolata L. Plants were grown at a substrate depth of 7.5 cm. Results indicate even after the 4-month period, Sedum spp. survived and maintained active photosynthetic metabolism to a greater extent than Schizachyrium and Coreopsis. Furthermore, when Sedum was watered after 28 days of drought, chlorophyll fluorescence (Fv/Fm) values recovered to values characteristic of the 2 days between watering (DBW) treatment. In contrast, the non-CAM plants required watering frequency every other day to survive and maintain active growth and development. Regardless of species, the greatest increase in total biomass accumulation and fastest growth occurred under the 2 DBW regimens.

Subfields: Plant Science

View Paper: https://www.semanticscholar.org/paper/1d7b93fcd409df38e03b22de0d659d7eb24b927e

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Citations in the corpus

• The dynamics of planted and colonising species on a green roof over six growing seasons 2001–2006: influence of substrate depth (2008, background): “Published green roof plant-based work tends to focus on survival and growth of commonly used taxa, particularly Sedums and other succulents (Monterusso et al. 2005), and their physiological characteristics (Durhman et al. 2006).”
• Green Roof Substrate Type and Depth Affect the Growth of the Native Species Dianthus fruticosus Under Reduced Irrigation Regimens (2011, background): “The results are consistent because plant growth and survival improve as the depth of the substrate increases (Boivin et al., 2001; Dunnett et al., 2007; Durhman et al., 2007; Getter and Rowe, 2006; Thuring et al., 2010; VanWoert et al., 2005).”
• Green roofs for hot and dry climates: Interacting effects of plant water use, succulence and substrate (2012, background): “Their drought tolerance is largely due to high leaf succulence and physiological adaptations such as CAM (Crassulacean Acid Metabolism) photosynthesis (Butler, 2012; Durhman et al., 2006).”