猪毛蒿枯落物水浸提液对5种草地植物种子萌发的化感作用

通过研究黄土高原撂荒农田优势植物猪毛蒿(Artemisiascoparia)枯落物水浸提液对5种草种子萌发的化感作用,以期为黄土高原撂荒地人工草地的建植及杂草防治提供一定的科学依据.结果表明,随着猪毛蒿枯落物水浸提液浓度的增大,受试草种测定指标有所差异,多年生黑麦草(Lolium perenne)、红豆草(Onobr ...

The Allelopathy Effect of Artemisia scoparia Water Extracts on Grassland Plants Seed Germination

The allelopathy effect of Artemisia scoparia water extracts on five grassland plants seed germination in the Loess Plateau were studied to provide scientific basis for artificial grassland establishment and weed control in abandoned farmland.The results showed that with the increase of the concentration of watered extract of A.scoparia,the indexes of tested grass species were different.The germination rate,germination potential,germination index,and bud or root length of Lolium perenne,Onobrychis viciaefolia,and Setaria italica were decreased compared with the control group.While the germination rate,germination potential,germination index,and root length of Lolium multiflorum,and the germination index and bud length of Medicago sativa had obvious trend of lower concentration(water extracts)promotion and higher concentration(water extracts)inhibition.Under the treatments of 0.01,0.025,0.05 and 0.1 g/mL of extracts,the allelopathic effect on growth of buds and roots of the five grass species were more significant,especially M.sativa and L.multiflorum.Compared with the control,the bud length of M.sativa and L.multiflorum was decreased by 35.8%and 42.2%,respectively,while the root length of M.sativa and L.multiflorum was decreased by 61.1%and 66.8%,respectively.Linear regression equation was used to fit the relationship between the comprehensive allelopathic index and the concentration of A.scoparia water extract,in which the order of sensitivity of five grass species was as follows:L.multiflorum>M.sativa>S.italica>L.perenne>O.viciaefolia.