短穗兔耳草的克隆生长特征

以调查统计的方法研究了高寒草甸匍匐茎植物短穗兔耳草Lagotis brachystachya无性系的生长特征、形态特征以及能量分配规律,研究结果表明:匍匐茎只有1条的短穗兔耳草最多,占60．47％,匍匐茎有4条的短穗兔耳草只占6．98％。在牧草生长盛期,短穗兔耳草无性系的基株高度4．03 cm,根长为9．11 cm,叶数为7．98;分株高度0．85 cm,根长2．73 cm,叶数为3．08;匍匐茎的茎生叶数为12．54,长度为15.14 cm,匍匐茎比节间重为2．18 mg／cm,粗度为0．97 mm,不同构件的干质量呈现出基株>匍匐茎>分株>茎生叶的规律。随着匍匐茎数目的增多,短穗兔耳萆无性系的基株根长逐渐增加,用于克隆繁殖的能量投资也有增加的趋势,其他参数都没有明显的变化规律。

Characteristics of clonal growth of Lagotis brachystachya

The characteristics of clonal plant, Lagotis brachystachya were studied in alpine meadow by investigation and statistics in this paper. The results are as follows. L. brachystachya with one stolon is the most one and its proportion is 60. 47%. The proportion of L. brachystachya with four stolons is 6. 98%. During growing season of alpine meadow, the height, root length and leaf number of L. brachystachya genet is 4. 03 cm, 9. 11 cm, and 7. 98, respectively. The height, root length and leaf number of L. brachystachya ramet is 0. 85 cm, 2. 73 cm, and 3. 08, respectively. The leaf number on the stolon, stolon length, specific stolon internode weight and stolon thickness of L. brachystachya clone is 12. 54, 15. 14 cm, 2. 18 mg/cm and 0. 97 mm,respectively. The dry mass of different modules shows the pattern as below: genet>stolon>ramet>leaf on the stolon. The root length of genet is decreased and the energy allocation for clonal reproduction has the decreasing trend with the increase of stolon number in L. brachystachya clone. The variations of other parameters of L. brachystachya clone haven't obvious patterns.