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Relevance of Carbon Sequestration to the Physiological and Morphological Traits of Several Green Roof Plants during the First Year after Construction

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American Journal of Plant Sciences 2017年第1期8卷 14-27页

作者： Takanori Kuronuma Hitoshi Watanabe Graduate School of Horticulture Chiba University Matsudo Japan Center for Environment Health and Field Sciences Chiba University Kashiwa Japan

Different vegetation types used for the extensive green roofs have characteristic physiological and morphological traits (e.g., C3, C4, or CAM photosynthesis, deciduous or evergreen). Several Sedum species are recognized as “inducible CAM” type plants. These differences in the physiological and morphological traits have a considerable effect on the carbon sequestration in the green roofs. The objective of the present study was to quantify the carbon sequestration in several green roof plants during the first year after the construction of the green roofs and to clarify the relevance of the physiological and morphological traits to each plant’s ability to sequester carbon in its body using the growth analysis method. We used Zoysia matrella , Ophiopogon japonicus , and Sedum mexicanum species for the study wherein, S. mexicanum was assigned to the wet, dry, and non-irrigation treatments, and Z. matrella and O. japonicus only received the wet treatment. During the first year after the construction, carbon sequestration in the plants and the substrate of S. mexicanum was in the range of 276 to 364 g-C/m2/year, which was similar to that of O. japonicus and the finding of a previous study. In contrast, Z. matrella exhibited the highest carbon sequestration (670 g-C/m2/year), which is also expressed as the relative plant C-sequestration rate per whole-plant C-content (RGRc), because Z. matrella is a C4 plant and exhibits the highest net assimilation rate (NARc) of all species. Significant differences were not observed in RGRc , NARc , and RMF (root mass fraction) in S. mexicanum between the wet and dry treatments. These results suggest that in countries with high rainfall, a high frequency of irrigation has an insignificant effect on the physiological and morphological characteristics, and carbon sequestration in the Sedum green roofs.

关键词： Growth Analysis Inducible Type of CAM Ophiopogon japonicus Sedum mexicanum Zoysia matrella

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