华南地区几种常见地被植物的化感作用

研究了5种地被植物对3种蔬菜种子萌发的化感作用，结果表明:3种草坪草（大叶油草、蔓花生和红花酢浆草）对3种蔬菜种子的综合化感效应（SE）均表现为抑制，红花酢浆草（SE=0.87）最大，蔓花生（SE=0.38）中等，大叶油草（SE=0.14）最低.这为红花酢浆草草坪和蔓花生草坪杂草较少，而大叶油草草坪杂草较多提供了理论依据.2种护坡野生地被植物中，三叶鬼针草表现出较强的化感抑制作用（SE=0.59），铺地黍则较弱（SE=0.19）.可见，铺地黍比三叶鬼针草更适于与其它草种共生.城市绿化中单纯草地要选择化感抑制作用强的草种以减少杂草的发生，而边坡护坡草种的选择要尽量避免化感抑制作用强的草种以利于边坡植被群落的稳定.建议增加化感作用作为地被植物选择的标准之一.

ALLEOPATHY OF FIVE GROUND COVER PLANTS IN SOUTH CHINA

The alleopathic effects of five ground cover plants on three vegetable seeds germination were studied. The results showed that Oxalis corymbosa had the strongest inhibitory effects on the seed germination of three vegetable seeds among the three lawn grasses, Arachis duranensis is the intermediate and Axonopus affinisi is the weakest (SE=0.87, 0.38, 0.14, respectively). This can be used to inteprete what there are less weeds in Oxalis corymbosa lawn and Arachis duranensis lawn and more weeds in Axonopus affinis lawn. Bidens pilosa had stronger inhibitory effects than what of Panicum repens. It suggested that Panicum repens is more suitable to coexist together with the other grasses or herbs than Bidens pilosa. The lawn grasses which have the strong inhibitory effects should be chosen to be used in the urban single lawn in order to decrease the appearance of the weeds, whereas be avoided to be used in the slop greening in order to keep the stability of slop vegetation. It was proposed that the alleopathy should be considered as one of the indices for selecting the ground cover plants.