科尔沁沙地白草、赖草无性系生长及适应对策的初步研究

通过对科尔沁沙地白草、赖草在各自典型生境下的观察与测定,分析比较了二者无性系生长及有关适应对策。研究结果表明:白草无性系能够以分株小而密度大为特点扩展地上空间,同时依赖于生物量在地下的大量分配以及根茎与不定芽在0~20cm土层内的高度发育占据土壤上层,起到缝合农田弃荒地风蚀破口的作用;赖草无性系采取的是稳长深扎的适应对策,其总生物量在地上和地下部分的分配较为均衡,而根茎不定芽趋向于在土壤下层(20~40cm)得到更好的发育。

A Preliminary Study on the Clonal Growth and Adaptive Strategy of Pennisetum Centrasiaticum and Leymus Secalinus

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.