松嫩平原林缘草地羽茅无性系构件结构与生长分析

doi:10.11686/cyxb2018396

摘要/Abstract

摘要： 以分蘖丛为单位,在生长季末期,采取大样本(n=30)随机取样的测定方法,定量分析了松嫩平原人工林缘草地的羽茅无性系构件结构及其数量特征之间的变化规律,为丛生型无性系植物生长策略的深入研究提供了科学积累。结果表明,在分株总数[(34.0±11.05)分株] 中营养株占优势(83.3%)并显著高于生殖株(16.7%);在分株总生物量[(21.51±10.28) g] 中生殖株占优势(66.9%)并显著高于营养株(33.1%)。羽茅无性系构件数量性状均存在较大变异。其中,变异系数最大的为生殖株分蘖节芽数达76.4%,最小为丛径27.6%;单株生产力生殖株是营养株的9.6倍,单株营养繁殖力营养株显著高于生殖株。羽茅无性系构件组分数量及其生物量均随着丛径的增加呈极显著的(P<0.01)幂函数异速生长,具有内、外部空间兼顾的补充和拓展策略。

关键词: 羽茅, 无性系, 构件数量特征, 生产力, 营养繁殖力, 异速生长

Abstract: Clusters of Achnatherum sibiricum clones (n=30) were randomly sampled from artificial grassland in forest margin sites on the Songnen Plain. Structures of the modules were analyzed and their characteristics quantified. In this way, scientific insight for the further study of the clonal plant growth strategy was obtained. It was found that there were on average (34.0±11.05) tillers per cluster, with significantly more vegetative tillers (83.3%) than reproductive tillers (16.7%). However, reproductive tillers were 9.6 times heavier than vegetative tillers and therefore the reproductive tillers were the dominant component (66.9%) of total biomass, which was (21.51±10.28) g·cluster^-1. Additionally, quantitative characteristics of the modules were highly variable. The trait with the largest coefficient of variation (76.4%) was the bud number on the reproductive tiller nodes, while the trait with the lowest coefficient of variation (27.6%) was cluster size. The vegetative reproductive capacity per vegetative tiller was significantly higher than that of reproductive tillers. Thus, a very significant (P<0.01) power allometry growth relationship was observed in A. sibiricum between cluster size, and module number and biomass, indicating a complementary and expansive strategy both within the cluster and with respect to its spatial expansion.

Key words: Achnatherum sibiricum, clone, quantitative characters on modules, productivity, vegetative reproductive capacity, allometry growth

宋月媛, 杨允菲. 松嫩平原林缘草地羽茅无性系构件结构与生长分析[J]. 草业学报, 2019, 28(7): 168-174.

SONG Yue-yuan, YANG Yun-fei. Module structures and the growth analysis of Achnatherum sibiricum clones in forest margin grassland in the Songnen Plain, China[J]. Acta Prataculturae Sinica, 2019, 28(7): 168-174.

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