科尔沁草原区火电厂储灰池植被恢复阶段赖草种群生物量年龄结构

对不同植被恢复阶段赖草(Leymus secalimus)种群分蘖株和根茎构件生物量年龄结构进行了测定与分析。结果表明:在科尔沁草原,赖草的分蘖节和根茎均可存活4个年度;8月中旬,植被恢复12年和5年储灰池中赖草无性系种群的根茎分别由4和3个龄级组成,根茎生物量均呈稳定型年龄结构;两个恢复阶段赖草无性系种群的分蘖株均由两个龄级组成,生物量均为增长型的年龄结构,恢复时间短者增长型结构尤为明显;赖草无性系种群1龄级分蘖株的生产力均高于2龄级,各龄级根茎的物质贮藏具有较大的生态可塑性。

Age Structures of Modular Biomass of Leymus secalimus Populations in the Different Stages of Vegetative Restoration on Coal Ash Storing Pools of Thermal Power Plant, Kerqin Steppe Region

Leymus secalimus is a fine and typical clonal plant, which distributes widely in the sandy soil of Kerqin steppe region. L. secalimus tiller nodes and rhizomes could live 4 years in Kerqin steppe region of Inner Mongolia. In mid-August, the rhizomes of the clonal populations consisted of four age classes in the 12-year vegetation restoration plot and three age classes in the 5-year vegetation restoration plot. Stable age structure was shown on the rhizome biomass unit area. During two restoration stages, the tillers were composed of two age classes; the tiller biomass showed expanding age structure; and the shorter the restoration term, the more obvious was the expanding age structure. The productivity of one-age class tillers was higher than that of two-age class tillers in the two plots. The matter storage of different age class rhizomes boasted great ecological plasticity.