Comparatively quantitative evaluation of CO₂ uptake and transpiration in landscape shrubs and the improved varieties

Abstract

The effects of planting in the city on CO₂ uptake and alleviation of urban heat island phenomenon has received much attention recently. Varieties of general landscape shrubs with improved CO₂ absorbing and transpiration ability have been developed. In this study, differences of the improved varieties and the general landscape shrubs were evaluated by comparing CO₂ absorption and transpiration quantitatively. In the results, Gardenia jasminoides J. Ellis 'Wald' showed 67 % higher growth rate in dry weight, and higher photosynthetic rate than the original. On the other hand, Salvia microphylla 'Kirsch Red' showed high transpiration ability compared with the original.