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毛白杨

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毛白杨


毛白杨


  毛白杨(学名:Populustomentosa)为杨柳科、杨属落叶大乔木,生长快,树干通直挺拔,是造林绿化的树种,广泛应用于城乡绿化,其品种适应性强,主根和侧根发达,枝叶茂密。是速生用材林,防护林和行道河渠绿化的好树种。

  毛白杨分布广泛,以黄河流域中、下游为中心分布区。雌株以河南省中部最为常见,山东次之,其它地区较少,北京有引有雌株。模式标本采自北京南口、西拐子(八达岭)。

  1、形态特征

  毛白杨乔木,高达30米。树皮幼时暗灰色,壮时灰绿色,渐变为灰白色,老时基部黑灰色,纵裂,粗糙,干直或微弯,皮孔菱形散生,或2-4连生;树冠圆锥形至卵圆形或圆形。侧枝开展,雄株斜上,老树枝下垂;小枝(嫩枝)初被灰毡毛,后光滑。芽卵形,花芽卵圆形或近球形,微被毡毛。长枝叶阔卵形或三角状卵形,长10-15厘米,宽8-13厘米,先端短渐尖,基部心形或截形,边缘深齿牙缘或波状齿牙缘,上面暗绿色,光滑,下面密生毡毛,后渐脱落;叶柄上部侧扁,长3-7厘米,顶端通常有2(3-4)腺点;短枝叶通常较小,长7-11厘米,宽6.5-10.5厘米(有时长达18厘米,宽15厘米),卵形或三角状卵形,先端渐尖,上面暗绿色有金属光泽,下面光滑,具深波状齿牙缘;叶柄稍短于叶片,侧扁,先端无腺点。雄花序长10-14(20)厘米,雄花苞片约具10个尖头,密生长毛,雄蕊6-12,花药红色;雌花序长4-7厘米,苞片褐色,尖裂,沿边缘有长毛;子房长椭圆形,柱头2裂,粉红色。果序长达14厘米;蒴果圆锥形或长卵形,2瓣裂。花期3月,果期4月(河南、陕西)-5月(河北、山东)。

  2、生长习性

  毛白杨喜生于海拔1500米以下的温和平原地区。

  毛白杨深根性,耐旱力较强,粘土、壤土、沙壤上或低湿轻度盐碱土均能生长。在水肥条件充足的地方生长最快,20年生即可成材。是中国速生树种之一。

  3、分布情况

  毛白杨分布广泛,在辽宁(南部)、河北、山东、山西、陕西、甘肃、河南、安徽、江苏、浙江等省均有分布,以黄河流域中、下游为中心分布区。

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