Kobayashi Katsumi, Yokoi Yota
Shizuoka Seiko Gakuin, Shizuoka 422-8021, Japan.
J Plant Res. 2003 Dec;116(6):443-53. doi: 10.1007/s10265-003-0119-1. Epub 2003 Oct 2.
The population dynamics of annual shoots in four clonal patches of Miscanthus sinensis was surveyed in terms of clone persistence. Over a study period of 3 years, a stable net shoot number was attained through a balanced replacement of old shoots by tillering 2-3 times a year. The birth rate was significantly correlated with the average monthly temperature. This suggests that a warm climate advances the date of tillerings, and shoots become taller as they emerge earlier. Five cohorts were identified, corresponding to shoots that were born in spring, early summer, summer, autumn and early winter. The autumn cohorts were more numerous and had a greater longevity than the other cohorts; they were thus were best suited for overwintering and, consequently, maintaining the population from one generation to the next. The shoots of earlier cohorts grew too tall to survive the cold of winter, which might cause freezing injury, while later cohorts' shoots excelled in overwintering because of their shortness. However, if the delayed shoots are very short, they will also have difficulty in surviving the early season of growth. Therefore, M. sinensis shoots have an optimum size for survival.
从克隆持久性的角度对四个芒草无性系斑块中一年生枝条的种群动态进行了调查。在为期3年的研究期内，通过每年2 - 3次分蘖对老枝条进行平衡替换，实现了稳定的净枝条数量。出生率与月平均温度显著相关。这表明温暖的气候会提前分蘖日期，且枝条出苗越早长得越高。确定了五个队列，分别对应于春季、初夏、夏季、秋季和初冬出生的枝条。秋季队列的数量比其他队列更多，寿命也更长；因此，它们最适合越冬，从而维持种群的世代延续。较早队列的枝条长得太高，无法在寒冷的冬季存活，这可能会导致冻害，而较晚队列的枝条由于较短，越冬能力较强。然而，如果延迟出苗的枝条非常短，它们在生长初期也难以存活。因此，芒草枝条具有一个最适合生存的大小。
