独叶草种群无性繁殖特性的研究

Research on Property of Asexual Reproduction of Kingdonia uniflora Population

对分布于秦岭不同群落类型中的独叶草种群无性繁殖特性进行了调查研究,结果表明 :(1)独叶草根状茎的长短随环境而异,最长的根状茎为125 cm,最短的根状茎为4.8cm,81.7％的植株根状茎长度在10～50cm;(2)独叶草种群是以无性繁殖为主的多年生草本植物,调查的2000余植株未发现由种子形成的实生苗;(3)独叶草克隆植株的产生是通过根状茎的断裂来实现的,一次断裂可产生2个或2个以上的克隆植株;(4)独叶草种群最主要的觅食方式是根状茎延伸,其无性系的克隆构型为稀疏游击型;(5)独叶草种群的繁殖比率2000年为1.06,2001年为1.04,如果没有人为因素的干扰,短期内种群不会灭绝。

The investigation was made on property of asexual reproduction of Kingdonia unijlora that distributed in different community types in Qinling Mts. The results showed that: (1) The length and shortness of rhizome of Kingdonia unijlora varied with environment, the longest rhizome is 125 cm, the shortest one is 4. 8 cm, and 81.7% rhizome of plant is between 10 cm and 50 cm; (2) Kingdonia unijlora population is perennial herb that a-sexual reproduction is predominant, asexual seedling by seed formation ia not found in two thousand plants investigated. (3) Development of Kingdonia unijlora clonal plant is came true by separation of rhizome, 2 or more than 2 clonal plants is given rise to in each separation; (4) The principal ways of finding feed of Kingdonia uniflora population is elongation of rhizome, whose clonal texture of asexual individual appears sparse pattern of moving; (5) Percentage of reproduction of Kingdonia unijlora population is 1. 06 in 2000 and is 1. 04 in 2001, and Kingdonia uniflora population will not extinct in short time without human disturbtion.