Abstract
Pleioblastus pubescens Nakai occurs in different light conditions of secondary forests in the warm-temperate zone of Japan. Under different light conditions, we experimentally grew P. pubescence by planting the rhizomes, surveyed emergence, growth and survivorship of culms and leaves, and observed the morphology of leaves. Emerging duration of culms including tillering culms was longer, and the cumulative number of those culms was larger in the high light intensity than in the low light intensity. In the high light intensity, survival number of culms tended to be higher. The culm mortality in the relative light intensity of 1% was the highest. In high light intensity, culm elongation rates were slower and the length after the complation elongation tended to be shorter than in the low light intensity. Therefore, it is suggested that P. pubescence has different regimes for invading and dominating the habitats in different light conditions. It is likely that P. pubescence increases the density with short culms in the high light intensity, on the other hand, it increases the length of culms with the low density in the low light intensit. In foliage, longevity of leaves in high light intensity is shorter than that in the low light intensity. It was suggested that the foliage in the high light intensity is maintained by longer duration of culm and leaf emergence, and that in low light intensity is maintained by longer leaf longevity. In addition, leaves were smaller and thicker in light conditions.
