Seasonal Changes in Diy Matter Productivity of Korean Native Plants, Aster koraiensis, Iris ensata, and Hemerocallis fiilva

摘要

This study was conducted to investigate the seasonal changes of dry matter productivity of three species of Korean native plants, Aster koraiensis, Iris ensata, and Hemerocallis fulva. Dry weight of aboveground organs from transplanting to flowering and that of underground organs after flowering respectively contributed to the greatest part of whole dry weight. Ratios of dry weights of the aboveground and underground organs in the first year were higher than that in the second year, indicating that assimilation product was distributed more to storage organs, rhizome or tuberous root in the second year. There was one peak point in relative growth rates (RGRs) and net assimilation rates (NARs) of A. koraiensis and H. fulva, while there were two peak points in I. ensata at the same year. Those points were concurrent with an early growth stage and an enlargement period of storage organs. The distribution of photosynthetic organ changed in the similar pattern of RGR or NAR. Changes of specific leaf areafor yearly averages of crop growth rate (CGR) of A. koraiensis, I. ensata and H. fulva were 4.6, 6.9, and 3.3 g.m~2-d~(-1)in the first year, and 23.4, 31.5, and 14.7 g.m~2 d~(-1) in the second year, respectively. NAR or leaf area index was positively correlated with CGR. There was a positive correlation between soil moisture and LAI, while a negative correlation was observed between NAR and climatic factors.