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Floss release, seed fall and germination of kapok seeds (Ceiba pentandra) in an urban environment

机译:在城市环境中木棉种子(木棉五味松)的牙线释放,种子掉落和发芽

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The tropical forest kapok tree occurs widely in urban environments, dispersing thousands of floss during the fruiting season. However, its seedlings are rarely seen around human settlements, raising questions on what factorsmight be limiting its recruitment. We examined the pattern of floss release, seed fall post-dispersal and influences of watering frequency on germination ofCeiba pentandraseeds. Evening,overall, was associated with a significantlyhigher rate and quantity of floss release (p= 0.0001) than were mid-day and morning, correlating well with the speed of wind across the day (rh = 0.666,p= 0.001). Mean dispersal quantity differed significantly between the individual sampled trees, in which the highest dispersal was recorded from trees located in relatively open areas and the lowest was recorded in closed stand trees. Seed fall was higher within100 mdistances than seed fall farther away from dispersing trees, depending on the microsites and weather conditions. Germination started on day 5 onwards and only 15.67% of sown seeds germinated. Watering frequency strongly influenced seed germination while local human activities determined fate of dispersed seeds. We conclude that recruitment ofC. pentandraspecies in the study area may have been limited by environmental and human factors operating at various local and spatial scales.
机译:热带森林木棉树广泛出现在城市环境中,在结果季节散布了数千种牙线。然而,在人类住区周围很少见到它的幼苗,这引发了关于可能限制其募集的因素的疑问。我们研究了牙线释放的模式,种子散落后的散布以及浇水频率对木棉五味子种子萌发的影响。总体而言,傍晚的松线释放速率和数量(p = 0.0001)明显高于中午和早晨,与全天的风速相关(rh = 0.666,p = 0.001)。各个样本树之间的平均散布量有显着差异,其中分布在相对开放区域的树木记录的散布最高,而封闭林分的树木记录的散布量最低。根据微地点和天气条件的不同,种子在100米内的掉落要比种子在远离分散树的地方掉落的要高。从第5天开始发芽,播种的种子仅发芽了15.67%。浇水频率强烈影响种子发芽,而当地人类活动决定了种子分散的命运。我们得出结论,C的招聘。研究区域中的五味子物种可能受到在各种局部和空间尺度上运行的环境和人为因素的限制。

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