草业学报Issue(2)：150-159,10.DOI:10.11686/cyxb2015393
紫茎泽兰浸提液对牧草种子发芽和幼苗生长的影响
Effects of Eupatorium adenophorum extracts on seed germination and seedling growth of pasture species
摘要
Abstract
Eupatorium adenophorum is a serious grass weed,among the 16 most invasive plant species in Chi-na,widespread in pasture,agricultural land and forests in Southwest China.The potential allelopathic effects of this grass and mitigation strategies were investigated.Trifoliumfragiferum ,Lolium perenne and Medicago sativa,widely distributed in Liangshan,Sichuan,were used to investigate seed germination and seedling growth by comparing the extracts of composted and fresh E .adenophorum (extract of composted E .adeno-phorum,ECA;extract of fresh E .adenophorum,EFA)to determine the effects of E .adenophorum on pas-ture species and to develop a composting technique.Soaking seed in EFA depressed seed germination and youngseedling growth to some extent;the effect was greater at higher concentrations.Seedling roots grew away from the EFA solution and some root tips blackened and died when growing in 100 mg/L EFA solution.After com-posting with a complex agent consisting of Pseudomonas putita sp.and Clostridium thermocellum sp.,ECA increased the rate of seed germination by 21.1%,increased seedling height growth by 24.1% and seedling bio-mass by 22.5%.The results suggest the decomposition of toxicants in E .adenophorum during the composting process promoted seed germination and seedling growth.EFA inhibited hydrolysis of starch,protein and inosi-tol phosphates in embryos,decreasing free amino acids,soluble sugars and soluble phosphorus in seedlings. Chlorophyll content and activities of roots and nitrate reductase were also decreased by EFA in contrast to ECA.Physiological changes in seedlings could be considered as a key reason for the inhibition of seed germina-tion and seedling growth by EFA or promotion by ECA.Composting probably resulted in decomposition of toxins in E .adenophorum,offering a technique for managing the harmful effects of E .adenophorum while providing a large organic fertilizer resource for agriculture.关键词
紫茎泽兰/牧草/化感效应/白三叶/黑麦草/紫花苜蓿Key words
Eupatorium adenophorum/pasture grass/allelopathic effect/Trifolium repens/Lolium perenne/Medicago sativa引用本文复制引用
王亚麒,焦玉洁,陈丹梅,袁玲,黄玥,吴叶宽,杜如万..紫茎泽兰浸提液对牧草种子发芽和幼苗生长的影响[J].草业学报,2016,(2):150-159,10.基金项目
四川省凉山州烟草公司科技项目（2015-01）资助。 （）
