CO2 removal characteristics of a novel type of moss and its potential for urban green roof applications

The feasibility of a novel type of moss (Parkortanso No. 1 synthesized from Racomitrium japonicum, Dozy and Molk) to capture CO₂ in urban areas was demonstrated. The effects of light intensity (500, 1000, and 1500 µmol/m².s), ambient temperature (10 °C, 25 °C, and 35 °C), age (1-year-old and 3 years old), and leaf color (bright and dark green) on the CO₂ removal caused by the moss concerned were investigated. It was determined that stronger light intensity resulted in higher CO₂ removal by the target moss. The moss showed the best CO₂ capture at 25 °C, while the CO₂-capturing capacities declined when the ambient temperatures were 10 °C and 35 °C. Three years old bright green moss was found to have higher CO₂-capturing capacity than 1 year old. Similarly, bright green moss exhibited the best CO₂ uptake out of the mosses concerned. The highest net CO₂ emission of the moss was − 1.94 ± 0.72 kgCO₂/m².year, which was comparable to other moss and plant species. Consequently, the bright green and old Parkortanso No. 1 moss are recommended for a green roof application in terms of CO₂ capture.

Graphical Abstract