Chen Shiping, Gao Yubao, Ren Anzhi, Liang Yu, Liu Shuang, Liu Ning
College of Life Sciences, Nankai University, Tianjin 300071.
Ying Yong Sheng Tai Xue Bao. 2002 Jan;13(1):45-9.
The individual growth, morphology and population biomass of Pennisetum centrasiaticum clones at two different habitats of farmland-sand dune ecotone on Keerqin sandy land of Inner Mongolia were compared in this study. P. centrasiaticum clones had significant morphological plasticity and different biomass distribution pattern at different habitats. Compared with P. centrasiaticum clones on semi-fixed sand dunes, those on farmland-sand dune transitive zone had a greater leaf elongation, longer rhizomes and internodes, more adventitious buds, larger amount of biomass, and deeper distribution of underground biomass, which were closely associated with the loose texture of the upper soil and the rather favorable water condition of the lower soil. It is believed that the population can well adapt itself to the farmland-sand dune ecotone habitats, and thus, play an important role in fixing mobile sand in succession of arenaceous vegetation.
本研究比较了内蒙古科尔沁沙地农田-沙丘交错带两个不同生境下的中亚狼尾草无性系的个体生长、形态特征及种群生物量。中亚狼尾草无性系在不同生境下具有显著的形态可塑性和不同的生物量分配模式。与半固定沙丘上的中亚狼尾草无性系相比，农田-沙丘过渡带上的无性系叶片伸长更大、根茎和节间更长、不定芽更多、生物量更大，且地下生物量分布更深，这与上层土壤质地疏松和下层土壤水分条件较为有利密切相关。研究认为，该种群能够很好地适应农田-沙丘交错带生境，从而在沙质植被演替中对固定流动沙丘发挥重要作用。
