【摘要】 对科尔沁沙地两类典型生境下芦苇根茎生长及生物量等特性进行了分析研究。结果表明,固定样地芦苇株高、分蘖株数、不定芽数、根茎节数及根茎总长均大于半流动样地。从半流动样地到固定样地,芦苇根茎表现出节间长度缩短,节间直径变粗的趋势。固定样地芦苇叶长、叶宽明显大于半流动样地,并且固定样地芦苇叶间距是半流动样地上的近3倍。与半流动样地相比,固定样地根茎生物量在总生物量中所占比例有所增加,而地上生物量所占比例减小。芦苇根茎生长及生物量分配在两类样地间的变化特征与土壤质地、紧实度以及养分含量等因素有密切的联系,同时也反映了芦苇对不同沙生生境的适应对策。更多还原

【Abstract】 The rhizomes growth and biomass allocation of Phragmites australis in two typical sandy habitats in Horqin Sandy Land were studied in this paper.The results were as follows: compared to the Phragmites australis on semi-mobile sand dunes,those on the fixed sand dunes had higher height,larger tillers number,longer rhizomes,more adventitious buds and more internodes.The length of internodes became shorter and the diameter of internodes became greater from the semi-mobile sand dune to the fixed sand dune.The leaf length,leaf width and the length between leaves of Phragmites australis were greater on fixed sand dunes than those on semi-mobile sand dunes.Compared to Phragmites australis on the semi-mobile sand dunes,those on fixed sand dunes allocated more biomass to rhizomes and less biomass to aboveground parts.Those growth changes in Phragmites australis were closely associated with the soil texture,soil hardness and nutrient content in different habitats,and it showed the plant adaptation strategies to different environments.更多还原