空心莲子草水浸提液对3种暖季型草坪草种子萌发与幼苗生长的影响

Allelopathic Effects of Aquatic Lixivium and Extracts from Alternanthera philoxeroides on Seed Germination and Early Seedling Growth of Three Kinds of Warm-season Turf Grass

为研究空心莲子草对草坪草的化感作用,以3种常见暖季型草坪草(细叶结缕草、地毯草和狗牙根)为试验材料,采用培养皿滤纸法对不同浓度空心莲子草水浸提液对3种常见暖季型草坪草种子萌发的影响进行研究。结果显示:空心莲子草全株水浸提液对细叶结缕草种子萌发的影响随着浓度的增加而抑制作用加强;对地毯草种子萌发,在0.125、0.25 g/mL浓度条件下具有促进作用,在0.0625、0.5 g/mL具有抑制作用;对狗牙根种子萌发影响表现出高浓度抑制、低浓度促进的双重效应。表明空心莲子草具有较强的化感作用,通过向周围环境释放化感物质影响种子的萌发和幼苗生长。

The paper aims to research the allelopathy effect of Alternanthera philoxeroides on turf grass.With three kinds of warm-season turf grass （Zoysia pacifica,Axonopus compressus and Cynodon dactylon） as test materials,dish-dipping method was used to explore the allelopathic effects of different concentrations＇ aquatic lixivium and extracts from Alternanthera philoxeroides on seed germination and early seedling growth of the three kinds of warm-season turf grass.The results showed that Alternanthera philoxeroides had inhibitory effect on Zoysia pacifica seeds germination and the effect tended to increase with the increase of the concentration of the aquatic lixivium and the extracts;the result of Axonopus compressus germination indicated that the concentration of 0.25 g/mL and 0.125 g/mL had promoting effect,whereas the concentration of 0.0625 g/mL and 0.5 g/mL had inhibitory effect.For Cynodon dactylon,it showed that high-concentration had inhibitory effect and low-concentration manifested promoting effect.Therefore,the study reveals that Alternanthera philoxeroides has allelopathic effect through releasing allelochemicals into the surrounding environment to affect seed germination and early seedling growth.