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首页> 外文期刊>Acta botanica sinica >Development and Age Structure of Ramets of Kalimeris integrifolia Populations in the Songnen Plains, Northeast China
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Development and Age Structure of Ramets of Kalimeris integrifolia Populations in the Songnen Plains, Northeast China

机译：东北松嫩平原整体轮虫种群分株的发育和年龄结构

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Kalimeris integrifolia Turcz. is a root sucker form perennial herb of Compositae. In the late period of growing season, fresh fleshy radicels grow up above the soil surface to develop root-borne buds, which in turn grow into ramets and taproot. On the basis of observation on numerous samples, methods to classify the age of ramets and buds for the root sucker herbaceous plant population and to estimate the ages of taproots were established according to their morphology. The age of ramets was classified based on the regeneration times of taproot buds. Ramets developed from new root sucker buds were classified as 1 a. After 1 a ramets died, the ramets reproduced from the taproots were 2 a, and so on. New buds from a root sucker were 0 a buds, other age classes of buds were consistent with that of ramets, i.e. buds produced from taproots of 1 a ramets were 1 a buds, and so on. In the hay clipping meadows of the Songnen Plains, for K. integrifolia population , there are three age classes of ramets, representing a steady age structure. The maximal age of taproots of ramets is 4 a. Among all age classes, the population productivity of 2 a ramets was the highest, and that of 1 a ramets was the lowest. The ramet productivity increased with ramet age. During the early period of growing season, the productivity of 3 a ramets was the highest, but after the middle of growing season, 1 a ramets showed the greatest relative growth rate. The population size and age structure in the next year could be accurately forecasted by the number of fresh roots with budlet and present population in late autumn. The potential population in the bud banks was more than two times of the present population, which may provide sufficient substitution in the future.
机译：Kalimeris integrifolia Turcz。是菊科多年生草本的根吸盘形式。在生长期后期，新鲜的肉质萝卜在土壤表面上方生长，形成根生芽，然后芽长成分株和主根。在对大量样品进行观察的基础上，根据根吸盘草本植物的形态，建立了对分株和芽的年龄进行分类并估算主根年龄的方法。分株的年龄根据主根芽的再生时间进行分类。从新的根吸盘芽发育的分株被分类为1 a。在1 a分株死亡后，从主根复制的分株为2 a，依此类推。根吸盘的新芽为0 a芽，其他年龄段的芽与分株相同，即由1 a ramets的主根产生的芽为1 a芽，依此类推。在松嫩平原的干草修剪草甸上，对于整枝锦葵科种群，分株有三个年龄类别，代表了稳定的年龄结构。分株主根的最大年龄为4 a。在所有年龄段中，2 a分株的人口生产力最高，1 a分株的人口生产力最低。分株生产率随分株年龄的增加而增加。在生长期初期，3 a分株的生产力最高，但在生长期中期后，1 a分株的相对增长率最高。通过有芽的新鲜根的数量和深秋的现有人口，可以准确地预测来年的人口规模和年龄结构。芽库中的潜在种群是现有种群的两倍以上，将来可能提供足够的替代。

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