外来种一年蓬化感作用的初步研究

为探讨外来种一年蓬的入侵机理,本文采用滤纸培养皿法研究了一年蓬水浸提液对莴苣、黄瓜、油菜、萝卜4种不同植物的化感作用.研究结果发现,一年蓬地下和地上部分浸提液对供试种子的萌发表现显著的抑制作用,并随着浸提液浓度的增加,抑制作用增强;一年蓬浸提液对供试植物主根的生长产生抑制作用,而对幼苗的生长,低浓度一年蓬的水浸提溶液对受试植物幼苗苗长则表现促进作用,高浓度才能抑制幼苗的生长.这说明一年蓬的化感作用主要表现在抑制植物种子的萌发和主根的伸长生长.

Preliminary Study on the Allelopathy of Alien Erigeron annuus

In order to explore the invasion mechanism of Alien E.annuus,effects of different concentration water extracts from E.annuus on seed germination and seedlings growth of four plants,namely L.sativa,C.sativus,B.campestris and R.sativus were studied by the methods of dish filter paper in this article.The results indicated that the germination rate of tested plant were inhibited evidently by water extracts of E.annuus,and as water extracts increased,the inhibition phenomena on the germination rate increased.Elongatings of main root were inhibited evidently by water extracts of E.annuus,but growing of seedlings were accelerated in the low concentration water extracts and were inhibited in the high concentration.So Allelopathy of Alien E.annuus performed in inhibiting seed germination of plant and elongation of main root.