沙生类短命植物粗柄独尾草(Eremurus inderiensis)的种子扩散及种子库分布格局

古尔班通古特沙漠南缘典型荒漠地区沙生类短命植物粗柄独尾草对干旱荒漠环境有极强的适应性,是早春季节荒漠区沙面固定、植被恢复的主要物种。为了认识粗柄独尾草群落更新的特征和能力,及进一步揭示其生态适应机制提供科学依据,采用模拟风速试验与样地调查法探究了其种子散布方式、种子库分布格局等种群生态学特征。结果表明:粗柄独尾草种子散布采取高种子数、近母株密集分布的r对策,种子库主要呈现为种群内聚集分布,种子产量和不同时期种子库密度均随季节和环境的变化而动态变化;粗柄独尾草种子雨持续时间短、强度大、单株产生完好种子在200~400之间,种子千粒重平均为8.895g;种子库输出途径主要有死亡后腐烂、发芽、动物当场取食和搬运,其中动物搬运和风力作用是影响种子库动态分布的最主要因子。

Seed Dispersal and Pattern of Seed Bank of Ephemeroid Desert Plant Eremurus Inderiensis

The Ephemeroid desert plant Eremurus inderiensis in Gurbantunggut Desert has strong adaptability to arid desert environment.It is a typical early spring plant and is a key species for vegetation restoration in desert area.In order to study the way of seed dispersal and seed bank pattern of the species,field experiments,including the simulated wind speed test and field survey,were conducted during March to October in 2008.The results show that:Eremurus inderiensis take an r-strategy as far as seed dispersal ...