三江平原不同群落类型小叶章种群密度季节动态比较

Dynamic Comparison of Population Density between Different Deyeuxia angustisfolia Communities in Sangjiang Plain

小叶章为三江平原典型草甸、沼泽化草甸、沼泽群落的优势植物。该文通过比较其密度动态变化，研究小叶章种群密度的变化规律。结果表明：典型草甸、沼泽化草甸小叶章种群密度季节动态呈双峰型，符合多项式方程变化；沼泽小叶章种群密度季节动态呈“Ｗ”型，以７月末为界。

Deyeuxia angustisfolia is the dominant specie in the typical meadow, marsh meadow and marsh communities of Sanjiang plain. By comparing the dynamic of density, the regulation of density of D. angustisfolia population was explored. The result reveals that the seasonal dynamic of density in typical meadow and marsh meadow was bimodal curve and tallied with polynomial equation; the seasonal dynamic of density in marsh was “W” curve and accored with two hyperbola equations delimited by the end of July.