关键词: 白草, 赖草, 无性系生长, 适应对策, 科尔沁沙地

Abstract: Based on an investigation in Horqin Sandy Land, Inner Mongolia, the adaptive strategies of two rhizomatous grasses, Pennisetum centrasiaticum and Leymus secalinus, in their own typical habitats were compared. Pennisetum centrasiaticum expanded its population above ground with small but numerous ramets, and occupied the plough layer of soil by means of allocating a larger proportion of biomass below the ground and highly developing rhizomes in the layer 0~20 cm of the soil, thus played an important role in prevention of wind erosion in abandoned farmland. Leymus secalinus seemed to have a deep rooted and steadily growing strategy: rather balanced distribution of biomass both aboveground and underground, and better development of adventitious buds in the layer 20-40 cm of the soil profile.

Key words: Pennisetum centrasiatium, Leymus secalinus, Clonal growth, Adaptive strategy, Horqin Sandy Land