杨树作为一个速生树种 ,绿化树种在城镇绿化中占有重要的位置 ,快速繁殖杨树已成为发展杨树的关键 ,尤其是扦插繁殖已被广大育林工作者所采纳。杨树扦插地的杂草对幼苗危害较大 ,尤其是插条周围生长的窄叶杂草 ,往往影响杨树的根系发育。因为这些杂草的根系分泌物能降低杨树的 Poplar as a fast-growing tree species, green tree species in urban greening occupies an important position, the rapid propagation of poplar has become the key to the development of poplar, especially cutting propagation has been adopted by the majority of plantation workers. Poplar cuttings of weeds on the seedlings more harmful, especially the growth of narrow cuttings around the cuttings, often affect the poplar root development. Because these weeds can reduce the root exudates poplar