伊犁河谷不同生境假苇拂子茅种群构件组成及其年龄结构

Components and age structures of Calamagrostis pseudophragmites population modules in the Yily River Valley area,China

假苇拂子茅是根茎禾草,属典型的无性系植物。通过生长季末期单位面积取样的方法,对新疆伊犁河谷地区不同生境的假苇拂子茅种群构件的组成及其年龄结构进行了研究。结果表明,4个样地的假苇拂子茅种群仅有样地H3是由生殖和营养分蘖株组成,其他3个样地均由营养分蘖株组成。4个样地的分蘖株均由3个龄级组成,均呈增长型年龄结构;4个样地的根茎均为2个龄级,其中又以2龄根茎占绝对优势。在生长季末期,4个样地的假苇拂子茅潜在种群均由冬性分蘖苗、根茎顶芽和各龄分蘖节向上生长的芽组成,分蘖节芽占优势地位,各龄级芽又以1龄级的占显著优势,均属于增长型年龄结构。牲畜啃食和淹水扰动对分蘖株物质生产和根茎的物质储存均有不利影响。

Calarnagrostis pseudophragmites is a perennial, rhizomatic, and typical clonal grass. Components and age structure of modules of C. pseudophragmites populations were studied at the end of the growing season in different habitats in the Yily River Valley area of Xinjiang, China. The populations were only composed of vegetative tillers in three habitats, while the fourth had both vegetative and reproductive ones. There were three age classes of tillers with an increasing age structure. There were two age classes of rhizomes and the 2nd was dominant. The potential populations consisted of winterness tillers, apical buds of rhizomes, and dominant buds growing upwards from tiller nodes. Each potential population had an increasing age structure but of all the age classes of buds, the 1st age was the most common. Livestock feeding and trampling all reduced storage of dry matter in tillers and rhizomes.