松嫩平原几种根茎型禾草种群的营养繁殖特性及其持续更新分析

Vegetative Propagation of Some Rhizomatous Grasses on Song—Nen Plain and Their Population Stability

根据对典型群落随机取样的调查与观测,分析了松嫩平原几种根茎型禾草种群的营养繁殖特性及其持续更新机理。根茎型禾草能够不断生产营养繁殖芽使种群持续更新。在松嫩平原8～10月份是根茎型禾草种群营养繁殖芽生产的旺盛时期。牛鞭草种群的芽库100%为根茎芽。羊草、拂子茅、假苇拂子茅、硬拂子茅、冰草、光稃茅香、野古草7个种群的芽库是由根茎芽和分蘖节芽组成。在两种形式芽输出成株的比率中,根茎型禾草种群普遍以根茎芽成株占较大比率。放牧利用可以促进羊草和冰草种群的分蘖节芽成株。

The characteristics of vegetative propagation of some rhizomatous grasses in the region of Song—Nen Plain and the mechanism of their population stability were investigated in a survey with random sampling from typical populations. It was observed that, during August—October, that is, the most productive period of rhizomatous grasses in the region, rhizome buds accounted for 100% of the bud pool of vegetative propagation in Hemarthria japonica population. The bud pool consisted of both rhizome buds and tillering node buds for the cases of Aneurolepidium chinense, Calamagrostis epigeios, C. pseudophragmites, C. rigidula, Agropyron cristatum, Hierochloe glabra and Arundinella hirta. For the above species the developed stems were mainly from rhizome buds. In the cases of Aneurolepidium chinense and Agropyron cristatum, grazing utilization would promote the development of tillering node buds into stems.