Module structures and the growth analysis of Achnatherum sibiricum clones in forest margin grassland in the Songnen Plain, China

doi:10.11686/cyxb2018396

Abstract

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

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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