松嫩平原光稃茅香实验无性系的营养繁殖力及生长规律

Vegetative propagative ability and growth regulation of Hierochlo glabra experimental clones on the Songnen Plain of China

光稃茅香是长根茎型禾草,是典型的无性系植物。在松嫩平原,实验光稃茅香无性系的芽库在整个生长季有25.9%～32.0%输出成分蘖株,芽库储备与输出具有相对的稳定性。在具有充分生长空间而又没有种间竞争的风沙土生境,实验光稃茅香无性系在一个生长季内所占据的空间面积平均为1.238m2。在生长季末期,光稃茅香无性系根茎的干物质贮量比分蘖株的生物量平均高9.7%。不同无性系在分蘖株和根茎的生长、生产及物质贮藏上具有相对的一致性。实验光稃茅香无性系的营养繁殖力具有较大的生态可塑性,每条根茎的长度及节间长度的生态可塑性则相对较小。在一个生长季内,实验光稃茅香无性系的分蘖株数量呈指数生长。

Hierochlo glabra is a perennial rhizome grass, and is a typical clonal plant. On the Songnen Plain, over the whole growth season, 25.9% to 32.0% of buds in the bud banks of the different experimental clones developed into tillers, with relative stability between the reserves and the output of the bud banks shown. During one growing season in the sandy soil habitat, the average area occupied by experimental clones was 1.238 m^2 when there was ample growing space and no interspecies competition. In the final stage of the growth season, the dry matter storage in rhizomes was 9.7% higher on average than tiller biomass. There was relative consistency between different clones in the growth, production and matter storage of tillers and rhizomes. For the clones, the ecological plasticity of vegetative propagative ability was high, but was relatively less for rhizome and inter-nodal length. Within a growing season, tiller number showed exponential growth.